YAS secondary school

YAS secondary school SECONDARY SCHOOL

SCHOOL ERP SYSTEM | MANAGEMENT SYSTEM YAS secondary school
22/02/2023

SCHOOL ERP SYSTEM | MANAGEMENT SYSTEM
YAS secondary school

please take note
12/10/2022

please take note

22/09/2022

Chemistry paper 1 Yas chemistry family test

1.a. Draw a labelled diagram showing the atomic structure of 24 12 mg. (2 marks)

b. The atomic number of phosphorus is 15. Draw a dot (•) and cross (x) diagram for the compound formed when phosphorus reacts with chlorine, atomic number 17. (1 mark)

2.a. State the condition under which a Bunsen burner produces a luminous flame. (1 mark)

b. Write an equation for the reaction that takes place in a luminous flame assuming the laboratory gas is butane. (1 mark)

c. One of the regions in the non-luminous flame is the unburnt gas region. Describe how the presence of this region can be shown using a wooden splint. (1 mark)

3.a. The elements sodium, magnesium and aluminium belong to group I, II and III respectively.Select the element with the highest electrical conductivity and give a reason. (1 mark)

b. Complete Table 1 to show the products of electrolysis for concentrated sodium chloride and molten sodium chloride.

4. A small piece of sodium metal was placed in a beaker containing pure water revision.

a. State two observations made during the reaction. (1 mark)

b. State and explain another observation made when a drop of phenolphthalein is added to the mixture in the beaker. (1 mark)

c. Explain why it is not advisable to carry out this experiment using potassium metal. (1 mark)

5. Describe how a pure sample of copper(II) nitrate crystals can be prepared using recycled copper wire. (3 marks)

6. The following apparatus and chemicals are used to investigate the percentage of air used when iron rusts: iron filings, 100 ml measuring cylinder, trough and water.

a. Draw a setup of the experiment. (2 marks)

b. Write an expression to show how the percentage of air used is calculated at the end of the experiment (1 mark)

7. Figure I shows a graph of atomic radius of some group I and group II elements.

a. Explain why the atomic radius of sodium is higher than that of:
i. lithium (1 mark)

ii. magnesium (1 mark)

b. Predict the atomic radius of calcium. (1 mark)

8. Compound D with formula, C3H4 was reacted with excess hydrogen chloride gas.

a. Give the name of compound D. (1 mark)

b. Draw two possible structures of the products formed. (2 marks)

9. Study the setup in Figure 2 and answer the questions that follow.

a. State the precaution that should be taken in carrying out the experiment. Give a reason. (1 mark)

b. State the observations made in the boiling tube. (2 marks)

10. Consider the following reaction:

N2(g) + 3H2(g) ⇌ 2NH3(g)

The enthalpy change is 92.4 kJ per mole of nitrogen.

a. Give the enthalpy change per mole of ammonia. (1 mark)

b. State and explain how each of the following affects the yield of ammonia:

i. Increase in temperature. (1 mark)

ii. Finely divided iron. (1 mark)

11. Study the flow chart in Figure 3 and answer the questions that follow.

a. Identify solid E. (1 mark)

b. Name the type of reaction that takes place in chamber 1. (1 mark)
c. Write an equation for the reaction that takes place in chamber 2. (1 mark)

12. Compounds H and J have the following structures.

a. Give the names of:
i. Compound H. (1 mark)

ii. Compound J. (1 mark)

b. State the conditions necessary for H and J to react. (1 mark)

13. Rhombic sulphur is one of the allotropes of sulphur

a. Draw the structure of rhombic sulphur. (1 mark)

b. Describe the observations made when rhombic sulphur is heated from room temperature until it boils. (1 mark)

14. The molar enthalpy of solution for potassium sulphate (K,SO) is +23.8 kJ.

a. On the axes provided, draw a labelled energy level diagram for the dissolution process of potassium sulphate in water. (2 marks)

b. Calculate the enthalpy change when 5:12 gof potassium sulphate is completely dissolved in water (K = 39:0;5=32,0; 0 - 16.0)(1 mark)
15.a. State Gay-Lussac's law. (1 mark)

b. 180 cm3 of nitrogen(II) oxide gas was reacted with 400 cm3 of oxygen gas.

i. Write an equation for the reaction. (1 mark)

ii. Calculate the total volume of the gases at the end of the reaction. (3 marks)

16. Describe how the setup in Figure 4 can be used to distinguish between 50.0 cm of 0.2M hydrochloric acid and 50.0 cm of 0.2 M ethanoic acid using pieces of 6 m length of magnesium ribbon and a stop watch. (3 marks)

17. Describe how dilute nitrie(V) acid and blue litmus papers can be used to distinguish between solid
samples of sodium carbonate and sodium sulphite. (3 marks)

18.a. Describe how propanone can be used to extract a pure sample of sunflower oil. (2 marks)

b. State why sodium hydroxide solution is not suitable for the extraction of sunflower oil. (1 mark)

19. 31.5 cm3 of concentrated nitric(V) acid was diluted to 500 cm3. 10.0 cm3 of the dilute acid required 25.0 cm3 of 0.4M sodium hydroxide for neutralisation.

a. Calculate concentration of the:

i. dilute acid. (1 mark)

ii. concentrated acid. (1 mark)

20. Figure 5 shows part of a radioactive decay series.

a. Write a nuclear equation for the formation of nuclide K from nuclide X. (1 mark)
b. The half-life of nuclide X is 47 minutes. Determine the percentage of nuclide X that remains after 188 minutes. (2 marks)

21. Aluminium is extracted from aluminium oxide by electrolysis.

a. Other than the cost of electricity, give another reason why this method is expensive. (1 mark)

b. Calculate the mass of aluminium obtained when a current of 20A is used for 5 hours. (1 Faraday - 96500 C; Al - 27.0)(2 marks)

22. Explain each of the following observations:

a. Articles made of copper turn green when left exposed in air over a long period of time. (1 mark)

b. Addition of aqueous ammonia to a solution containing copper(II)ions produces a deep blue solution (1 mark)

23.a. State what is meant by relative atomic mass of an element. (1 mark)

b.

Let RAM 7 x be n C X
RAM 12 N 96.4 = 4
n
0.3
% mass 3.6
12 96.4
n n = 96.4
1.2
96.4
n
Ratio 1 4 = 80.3First row is a table header How to use it? b. A compound of carbon and element X with formula, CX, contains 3.6% carbon by mass.
Calculate the relative atomic mass of X. (2 marks)

24. Carbon(II) oxide can be prepared by dehydration of ethanedioic acid

a. Complete the following equation to show the reaction that takes place. (1 mark) H20204

b. Name another reagent that can be used to prepare carbon(II) oxide by dehydration (1 mark)

25. Figure 6 shows an incomplete diagram of a setup for laboratory preparation of nitrogen gas.

a. Complete the setup in Figure 6 to show how nitrogen gas can be collected. (2 marks)
b. The nitrogen prepared using this setup is purer than that obtained from air. Give a reason(1 mark)

26. Hydrazine, is used as a fuel in rockets. Using the bond energies in Table 2, calculate the enthalpy

change for combustion of hydrazine.

N₂H4 (1) + O₂(g) → N₂(g) + 2H₂O(g)

Table 2

Bond Bond
Energy
kJ/mol
N-H 388
N-N 163
O=O 496
N≡N 944
O-H 46327.a. Table 3 gives the standard reduction potentials of some group VII elements. Table 3
State and explain the reactions that take place when aqueous bromine is added to a sample of sea water containing both chloride and iodide ions. (2 marks)

Reduction equations Eo/V
CI2 + 2e→2CI- +1.36
Br₂ +2e→2Br- +1.07
I2 + 2e→21- +0.54b. Give a reason why potassium iodide is added to table salt
Questions and Answers

Secondary

Chemistry paper 1

1.a. Draw a labelled diagram showing the atomic structure of 24 12 mg. (2 marks)

b. The atomic number of phosphorus is 15. Draw a dot (•) and cross (x) diagram for the compound formed when phosphorus reacts with chlorine, atomic number 17. (1 mark)

2.a. State the condition under which a Bunsen burner produces a luminous flame. (1 mark)
When airhole/collar is closed or fully closed
b. Write an equation for the reaction that takes place in a luminous flame assuming the laboratory gas is butane. (1 mark)

b. CH4(g) + 4O2(g) → C(s) + 3CO(g) + CO(g) +5H2O(I)

OR

CH4(g) + 4O2(g) → C(s) + CO(g) + CO(g) +5H2O(I)

c. One of the regions in the non-luminous flame is the unburnt gas region. Describe how the presence of this region can be shown using a wooden splint. (1 mark)

3.a. The elements sodium, magnesium and aluminium belong to group I, II and III respectively.

Select the element with the highest electrical conductivity and give a reason. (1 mark)

When airhole/collar is closed or fully closed

b. Complete Table 1 to show the products of electrolysis for concentrated sodium chloride and molten sodium chloride.

CH4(g) + 4O2(g) → C(s) + 3CO(g) + CO(g) +5H2O(I)

OR

CH4(g) + 4O2(g) → C(s) + CO(g) + CO(g) +5H2O(I)

4. A small piece of sodium metal was placed in a beaker containing pure water revision.

a. State two observations made during the reaction. (1 mark)

The piece of metal darts/floats
Melts into silvery ball
Production of effervescence/hissing sound
The beaker becomes warm
b. State and explain another observation made when a drop of phenolphthalein is added to the mixture in the beaker. (1 mark)

Solution turns pink because sodium hydroxide/alkaline solution is formed
c. Explain why it is not advisable to carry out this experiment using potassium metal. (1 mark)

Potassium reacts explosively with water/ more vigorously/ more violent
5. Describe how a pure sample of copper(II) nitrate crystals can be prepared using recycled copper wire. (3 marks)

Heat the copper wire in air to form copper
Add excess copper(II) oxide to dilute nitric acid
Filter to remove unreacted copper(II) oxide
Heat the resulting solution to saturation
Allow it to cool to form crystals
Dry/filter the crystals
6. The following apparatus and chemicals are used to investigate the percentage of air used when iron rusts: iron filings, 100 ml measuring cylinder, trough and water.

a. Draw a setup of the experiment. (2 marks)

b. Write an expression to show how the percentage of air used is calculated at the end of the experiment (1 mark)
Initial height of air column - Final height of air column/Initial height of air column

OR

Initial height of water - Final height of water/Initial height of water

7. Figure I shows a graph of atomic radius of some group I and group II elements.

a. Explain why the atomic radius of sodium is higher than that of:
i. lithium (1 mark)

Na = 2.8.1

Li = 2.1

Sodium has 3 energy levels while lithium has two

or

Li = 2

Na = 2.8.1

ii. magnesium (1 mark)

Mg = 2.8.2

Na = 2.8.1

The effective nuclear charge is higher in magnesium than sodium. Mg has a higher number of protons

b. Predict the atomic radius of calcium. (1 mark)

208± 2 Ithout showing on the graph Extrapolate to 20 on x-axis and mark to value
8. Compound D with formula, C3H4 was reacted with excess hydrogen chloride gas.

a. Give the name of compound D. (1 mark)

Propyne
prop 1 -yne
prop -1,2-iodene
b. Draw two possible structures of the products formed. (2 marks)

9. Study the setup in Figure 2 and answer the questions that follow.

a. State the precaution that should be taken in carrying out the experiment. Give a reason. (1 mark)

The experiment should be carried out in a fume chamber out in open since carbon(II) oxide is poisonous
b. State the observations made in the boiling tube. (2 marks)

A white percipitate is formed which dissolves to form a colourless solution 10. Consider the following reaction:
N2(g) + 3H2(g) ⇌ 2NH3(g)

The enthalpy change is 92.4 kJ per mole of nitrogen.

a. Give the enthalpy change per mole of ammonia. (1 mark)

- 92.4/2 ⇒ =46.2 KJmol-1 b. State and explain how each of the following affects the yield of ammonia:
i. Increase in temperature. (1 mark)

i. It lowers the yield of ammonia since the forward reaction is exothermic or backward reaction is endothermic
ii. Finely divided iron. (1 mark)

ii. No effect

A catalyst has no effect on the position of the equilibrium
11. Study the flow chart in Figure 3 and answer the questions that follow.

a. Identify solid E. (1 mark)

Potassium magnate VII or maganese(iv) oxide lead(vi) oxide

b. Name the type of reaction that takes place in chamber 1. (1 mark)
Red ox/oxidation
c. Write an equation for the reaction that takes place in chamber 2. (1 mark)

CI2(g) + 2NaOH → NaCl(aq) + NaOCl(aq) + H2O
12. Compounds H and J have the following structures.

a. Give the names of:
i. Compound H. (1 mark)

3-methylpentanol/ 3-methylpentanol
ii. Compound J. (1 mark)

Butanoic acid
b. State the conditions necessary for H and J to react. (1 mark)

Concentrated sulphuric VI acid/ sulphuric acid
Warm/heat/ temperature between 3-6oC 13. Rhombic sulphur is one of the allotropes of sulphur
a. Draw the structure of rhombic sulphur. (1 mark)

b. Describe the observations made when rhombic sulphur is heated from room temperature until it boils. (1 mark)
Yellow solid forms amber liquid
As the temperature increases the liquid becomes darker and vicious
Then it turns dark red/brown and less vicious
14. The molar enthalpy of solution for potassium sulphate (K,SO) is +23.8 kJ.

a. On the axes provided, draw a labelled energy level diagram for the dissolution process of potassium sulphate in water. (2 marks)

b. Calculate the enthalpy change when 5:12 gof potassium sulphate is completely dissolved in water (K = 39:0;5=32,0; 0 - 16.0)(1 mark)
RFM of K2SO2 = 174

moles of K2SO2 =5.22/174 = 0.03

ΔH = 0.03 x 23.8 = 0.714KJ

15.a. State Gay-Lussac's law. (1 mark)

When gases react, they do so in volumes that bear simple ratios to one another and to the products if gaseous at constant temperature and pressure
b. 180 cm3 of nitrogen(II) oxide gas was reacted with 400 cm3 of oxygen gas.

i. Write an equation for the reaction. (1 mark)

2NO(g) + O2(g) → 2NO2(g)
ii. Calculate the total volume of the gases at the end of the reaction. (3 marks)

2NO + O2 → 2NO2
using ratio

Volume of oxygen =180 x 1/2 = 90cm3

Volume of oxygen unreacted = 400 - 90

= 310

Volume of NO2 = 18cm3

Total volume = 310 + 180

= 490cm3

16. Describe how the setup in Figure 4 can be used to distinguish between 50.0 cm of 0.2M hydrochloric acid and 50.0 cm of 0.2 M ethanoic acid using pieces of 6 m length of magnesium ribbon and a stop watch. (3 marks)

Any contact between
Mg and hydrochloric acid
Mg and ethanoic acid
Using a stopwatch to show the difference
Conclusion - HCl takes a shorter time
Put a 6cm Mg ribbon in conical flask and add 50cm3
HCl. Using a stopwatch, record the
volume of gases collected at a time inferral e.g. 15cm3
Repeat the experiment using 50cm3 of ethanoic acid
More/higher volume of gas will be collected when HCl is used than ethanoic acid at same inferral of time OR
The reaction will take a shorter time to completion when HCl is used than when ethanoic acid used 17. Describe how dilute nitrie(V) acid and blue litmus papers can be used to distinguish between solid samples of sodium carbonate and sodium sulphite. (3 marks)
Place blue items at the mouth of test tubes
Both turn red
Thereafter one of them is bleached
The sample that produces bleaching on the litmus is sodium sulphite 18.a. Describe how propanone can be used to extract a pure sample of sunflower oil. (2 marks)
Crush the sunflower seeds using motar and pestle
Add propane and stir
Decant
Leave the extract on sunlight for propane to evaporate leaving oil behind
b. State why sodium hydroxide solution is not suitable for the extraction of sunflower oil. (1 mark)

It will react with oil to form soap
19. 31.5 cm3 of concentrated nitric(V) acid was diluted to 500 cm3. 10.0 cm3 of the dilute acid required 25.0 cm3 of 0.4M sodium hydroxide for neutralisation.

a. Calculate concentration of the:

i. dilute acid. (1 mark)

Moles of NaOH = 0.4 x 25 = 0.01/1000

Moles of HNO3 = 0.01

Molarity of HNO3 = 0.01 x 1000/10

ii. concentrated acid. (1 mark)

C1V1 = C2V2 1 x 500/31.5 = 15.9M

20. Figure 5 shows part of a radioactive decay series.

a. Write a nuclear equation for the formation of nuclide K from nuclide X. (1 mark)
Q = It

= 20 x 5 x 60 = 360000

moles = 360000 = 1.244moles

3 x 96500

mass = 1.244 x 27

= 33.588g

b. The half-life of nuclide X is 47 minutes. Determine the percentage of nuclide X that remains after 188 minutes. (2 marks)

21. Aluminium is extracted from aluminium oxide by electrolysis.

a. Other than the cost of electricity, give another reason why this method is expensive. (1 mark)

The graphite anode has to be replaced periodically
b. Calculate the mass of aluminium obtained when a current of 20A is used for 5 hours. (1 Faraday - 96500 C; Al - 27.0)(2 marks)

22. Explain each of the following observations:

a. Articles made of copper turn green when left exposed in air over a long period of time. (1 mark)

Due to formation of copper(II) carbonate. Since copper reacts with carbon(IV) oxide/CO2 b. Addition of aqueous ammonia to a solution containing copper(II)ions produces a deep blue solution (1 mark)
Due to formation of complex ion of tetramine copper(II) ions OR due to formation of tetramine copper (II) ions
23.a. State what is meant by relative atomic mass of an element. (1 mark)

Is the mass of one atom of an element compound to the mass of carbon - 12
b.

Let RAM 7 x be n C X
RAM 12 N 96.4 = 4
n
0.3
% mass 3.6
12 96.4
n n = 96.4
1.2
96.4
n
Ratio 1 4 = 80.3First row is a table header How to use it? b. A compound of carbon and element X with formula, CX, contains 3.6% carbon by mass.
Calculate the relative atomic mass of X. (2 marks)

24. Carbon(II) oxide can be prepared by dehydration of ethanedioic acid

a. Complete the following equation to show the reaction that takes place. (1 mark) H20204

H2C2O4 → CO(g) + CO2(g) + H2O(I)

b. Name another reagent that can be used to prepare carbon(II) oxide by dehydration (1 mark)

Methanoic
Sodium methanate
25. Figure 6 shows an incomplete diagram of a setup for laboratory preparation of nitrogen gas.

a. Complete the setup in Figure 6 to show how nitrogen gas can be collected. (2 marks)
b. The nitrogen prepared using this setup is purer than that obtained from air. Give a reason(1 mark)

It has impurities such as noble gases
26. Hydrazine, is used as a fuel in rockets. Using the bond energies in Table 2, calculate the enthalpy change for combustion of hydrazine.

N₂H4 (1) + O₂(g) → N₂(g) + 2H₂O(g)

Table 2

Bond Bond
Energy
kJ/mol
N-H 388
N-N 163
O=O 496
N≡N 944
O-H 463N2H4 + O2 → N2 + H2O
Bonds broken

4 x 388 = 1552

1 x 163 = 163

1 x 496 = 496

= 2211

Bonds formed

1 x 944 = 944

2 x 463 = 1852

= -2796

Enthalpy of combination = -2796 + 2211

= 585KJmol-

27.a. Table 3 gives the standard reduction potentials of some group VII elements. Table 3

State and explain the reactions that take place when aqueous bromine is added to a sample of sea water containing both chloride and iodide ions. (2 marks)

a. Br2(aq) + 2I-aq) → 2Br-(aq) + I2(aq)
Br2(aq) + 2CI- → No reaction

Bromine will oxidize iodide ions to iodine since it has more positive Eθ
Bromine will not displace chlorine since Eθ for Cl- is more positive
Reduction equations Eo/V
CI2 + 2e→2CI- +1.36
Br₂ +2e→2Br- +1.07
I2 + 2e→21- +0.54b. Give a reason why potassium iodide is added to table salt
Potassium iodide is a source of iodine is needed to regulate functioning of thyroid gland

Introductiontochemistry Yas chemistry family1. WoodensplintsFandGwereplacedindifferentzonesofaBunsenburnerflame.Thedia...
22/09/2022

Introductiontochemistry Yas chemistry family
1. WoodensplintsFandGwereplacedindifferentzonesofaBunsenburnerflame.

Thediagrambelow givestheobservationsthatweremade

(a)ExplainthedifferencebetweenFandG
(b)Namethetypeofflamethatwasusedintheaboveexperiment
2. Thediagramsbelowrepresentalistofapparatuswhicharecommonlyusedina
chemistrylaboratory:-

(a)Givethecorrectorderoftheapparatus,usingthelettersonly,toshowthecorrect
arrangement

thatcanbeusedtoprepareandinvestigatethenatureofPHofasampleof

onionsolution
(b)Nameonechemicalsubstanceandapparatusthatisneededinthisexperiment
3. (a)Whentheair-holeisfullyopened,thebunsenburnerproducesanon-luminous
flame.

Explain
(b)Drawalabelleddiagramofanon-luminousflame
4. (a)Whatisadrug?
(b)Givetwodrugsthatarecommonlyabusedbytheyouth.
5. Thediagrambelowshowsthreemethodsforcollectinggasesinthelaboratory

A B C D
E

G F
Burnt
parts Burntpart

(a)NamethemethodsAandB
(b)Fromthemethodsabove,identifyonethatissuitableforcollectingsulphur(IV)
oxide.

Explain

6. Amixtureofhexaneandwaterwasshakenandlefttoseparateasshowninthe
diagrambelow:

Statetheidentityof;
(i)P.............................................. (ii)W ............................................
7. Thediagramsbelowaresomecommonlaboratoryapparatus.Nameeachapparatus
and

stateitsuse
Diagram Name Use

(1⁄2mk) (1⁄2mk)

(1⁄2mk) (1⁄2mk)

8. ThediagrambelowshowssomepartsofaBunsenburner

ExplainhowthepartslabelledTandUaresuitedtotheirfunctions
9. Thediagrambelowshowstheappearanceoftwopiecesofpaperplacedindifferent
partsofa
non-luminousflameofaBunsenburnerandremovedquicklybeforetheycaughtfire.

T

U
P

W

(a)Whatdotheexperimentsshowabouttheouterregionoftheflame?
(b)Fromtheaboveexperiment,whichpartoftheflameisbettertousefor
heating?Giveareason
10. Acrystalofcopper(II)sulphatewasplacedinabeakerofwater.Thebeakerwasleft
standingfor
twodayswithoutshaking.Stateandexplaintheobservationsthatweremade.
11. Studytheinformationinthetablebelowandanswerquestionsthatfollow.

(Lettersgivenarenotrealsymbols)

Ions Electronarrangement Ionicradius(nm)
A+
B+
C2+

2.8
2.8.8
2.8

0.95
0.133
0.065

Explainwhytheionicradiusof:-
(a)B+isgreaterthanthatofA+
(b)C
2+issmallerthantheofA+

Simpleclassificationofsubstances
1. Thediagrambelowshowstheheatingcurveofapuresubstance.Studyitandanswer
the
questionsthatfollow:

(a)WhatphysicalchangesaretakingplaceatpointsXandZ?
(b)Explainwhathappenstothemeltingpointofsodiumchlorideaddedtothis
substance
2. (a)Statetwodifferencesbetweenluminousflameandnon-luminousflame

Temperature

B
X C
Y

444 D Z

115
A

Time

(b)ItisadvisabletosetaBunsenburnertoluminousflamepriortoanexperiment.

Explain

3. Thepaperchromatographyofaplantextractgavethefollowingresults:
Solvent Numberofspots
X 6
Y 2
Z 3

(a)Whichisthemostsuitablesolventforpurifyingtheextract?Explain
(b)Ballpencannotbeusedtomarksolventfrontintheabovechromatography.
Explain
4. Nametheprocesswhichtakesplacewhen:
(a)SolidCarbon(Iv)Oxide(dryice)changesdirectlyintogas
(b)Aredlitmuspaperturnswhitewhendroppedintochlorinewater
(c)Propenegasmoleculesareconvertedintoagiantmolecule
5. Asampleofcopperturningswasfoundtobecontaminatedwithcopper(II)oxide.
Describe
howasampleofcoppermetalcanbeseparatedfromthemixture
6. Copper(II)oxideandcharcoalareblacksolids.Howwouldyoudistinguishbetween
the
twosolids?
7. a)Whatischromatography?
b)Givetwoapplicationsofchromatography
8. ThetwoelementsPandRwereseparatelyburnedinair,theproductsgavethe
results
recordedinthetablebelow:
ELEMENTS PHYSICALSTATE
ATROOMTEMPERATURE

PSOLID RSOLID

Physicalstatesofproducts Whitesolidpowder

only

ColourlessgasesLandM
Natureofsolutionsinwater Basic LstronglyacidicMslightly

acidic

(a)SuggesttheidentityofelementR..............................................................
(b)Describehowthenatureofthesolutionsoftheoftheoxidesweredetermined
9 Thediagrambelowrepresentsapaperchromatographyforthethreebrandsofsoft
drinks

containingbannedartificialfoodadditives.

4
1

6

2

7
5
3

A B C

BRANDSOFSOFTDRINKS

AandCfoundtocontainthebannedartificialfoodadditives.Whichnumbersindicate
the
bannedartificialfoodadditives?

10. Withoutusinganylaboratorychemical,describeasimplelaboratoryexperimentto
distinguish
betweencalciumhydrogencarbonateandsodiumhydrogencarbonate
11. SubstanceQhasameltingpointof15oCandboilingpointof70oC.
(a)Onthesameaxes,drawthemeltingpointandboilingpointgraphforQandthe
room

temperature

(b)StatethephysicalstateofsubstanceQatroomtemperature
12. Cookingoilscompriseofamixtureofcompoundswhichhaveaboilingpointrange

of23oCto27oC.
(i)Whatevidenceisthentosupportthestatementthatcookingoilisamixture?
(ii)Nameanotherexperimentaltechniquethatcouldbeusedtoconfirmyouranswer
inpart(i)above

13. Aform1studentcarriedouttheseparationasshownintheset-upbelow:-

(i)Identifythemethodabove.................................................................................
(ii)Giveoneofitsdisadvantages
(iii)Nameamixturewhichcanbeseparatedbytheset-upabove
14. Whatismeantbymeltingpointandboilingpointofasubstance?
15. Theapparatusbelowwereusedbyastudenttostudytheeffectofheatonhydrated
copperIIsulphate
Temperature
oC

Time(minutes)

(a)Whatistheroleoftheicecoldwater ...............
(b)NameliquidP ..................................................................
(c)Whatobservationismadeintheboilingtube
17. Thediagrambelowshowschromatogramsofbloodsamplesobtainedfromthree
athletes.
Oneathleteusedillegaldrugtoimproveperformanceincompetition.

(a)Namethelinemarked M ..........................................................
(b)Identifytheathletewhousedillegaldrug .............................................
18. Classifythefollowingprocessesaschemicalchangesorphysicalchanges
Process physicalorchemical
Neutralization .............................................
Sublimation .............................................
Fractionaldistillation ...............................................
Displacementreaction ................................................
19. Givetworeasonswhyaluminousflameisnotusedforheatingpurposes
20. Classifythefollowingprocessesaschemicalchangesorphysicalchanges
Process physicalorchemical
Neutralization .............................................
Sublimation .............................................
Fractionaldistillation ...............................................
Displacementreaction ................................................
21. Givetworeasonswhyaluminousflameisnotusedforheatingpurposes
22. Statetwocriteriafordeterminingthepurityofasubstance




Drug

23. Study
the

informationinthetablebelowandanswerthequestions.

i)Amixturecontainsethene,Hydrogenandammoniagases.Explainhowa

sampleof

hydrogen gascanbeobtained from thismixture.

24. a)i)ThediagrambelowshowspotsofapuresubstanceA,B,andCona
chromatography

paper.SpotDisthatofamixture

AfterdevelopmentA,B,andCwerefoundtohavemoved8cm,3cmand6cm
respectively.
Dhadseparatedintotwospotswhichhadmoved6cmand8cm
Onthediagramabove;
I.Labelthebaseline(origin)
II.Showthepositionsofallthespotsafterdevelopment
ii)IdentifythesubstancespresentinmixtureD
b)Describehowsolidammoniumchloridecanbeseparatedfromasolidmixtureof
ammoniumchlorideandanhydrouscalciumchloride
c)Thetablebelowshowsliquidsthataremiscibleandthosethatareimmiscible

Liquid L3 L4
L1 Miscible Miscible
L2 Miscible Immiscible
Usetheinformationgiveninthetabletoanswerthatquestionsthatfollow;
i)NamethemethodthatcanbeusedtoseparateL1andL2fromamixtureofthetwo
ii)DescribehowamixtureofL2andL4canbeseparated
25. Astudentleftsomecrushedfruitmixturewithwaterforsomedays.Hefound
themixture
had fermented.Heconcludedthatthemixturewascontaminatedwithwaterand
ethanolwith
boilingpointof100oCand78oCrespectively.Theset-upofapparatusbelowareused
toseparate

themixture.
Substance Water Concentrated
sulphuric(VI)acid

Concentrated
sodiumhydroxide
Ethene Slightlysoluble Soluble Insoluble
Ammonia Verysoluble Verysoluble Verysoluble
Hydrogen Slightlysoluble Insoluble Insoluble

A
Thermometer B

Mixture

Conica
l
Distillat flask
e
ApparatusW

● ● ● ●
A B C

(i)NamethepieceofapparatuslabelledW
(ii)Whatisthepurposeofthethermometerintheset-up?
iii)AtwhichendoftheapparatusW shouldtapwaterbe
connected?.................................
(iv)Whichliquidwascollectedasthefirstdistillate?Explain
(v)Whatisthenamegiventotheabovemethodofseparatingmixture?
(vi)Statetwoapplicationsoftheabovemethodofseparatingmixtures
(vi)Whatpropertiesofthemixturemakesitpossibleforthecomponenttobe
separated

bytheabovemethods?

26. Theset-upbelowwasusedtoseparateamixture:-

(a)Nametheapparatusmissingintheset-up
(b)GiveoneexampleofmixtureT
(c)Whatisthenameofthismethodofseparation
27. a)Thediagrambelowshowsaset–upusedbyastudenttofindoutwhathappens

whenCopper(II)sulphatecrystalsareheated.

(i)Statetheobservationsmadewhenthebluecopper(II)sulphatecrystalsare
heated.

(ii)IdentifyliquidYandwriteanequationforitsformation.
b)PelletsofsodiumhydrogenandanhydrousCopper(II)sulphatewereputin

separatePetri-
dishesandleftintheopenfortwohours.ExplaintheobservationineachPetri-dish.

Bluecopper
(II)sulphate
crystals Heat

Liquid
Y

Delivery
Testtube
Beaker

28. Thechromatographybelowshowstheconstituentsofaflowerextractusinganorganic
solvent:-

(a)(i)Nameapossibleorganicsolventyoucanuseforthisexperiment
(ii)Stateonepropertythatmakestheredpigmenttomovethefurthestdistance

fromM

(iii)Describehowonecouldgetasampleofyellowpigment
(iv)Onthediagramindicatesolventfront
(b)DescribehowAluminiumchloridecanbeseparatedfromamixtureofaluminium
chloride

andsodiumchloride

29.Studytheinformationbelowandanswerthequestionsthatfollow:¬
Solid Coldwater Hotwater
R Soluble Soluble
V Insoluble Insoluble
S Insoluble Insoluble
DescribehowthemixtureofsolidR,S,andVcanbeseparated
30. Givenamixtureoflead(II)oxide,ammoniumchlorideandsodiumchloride,describe
howthis

mixturecan beseparatedtoobtainasampleofeach.

31. ThesetupbelowwasusedtoseparatetwomiscibleliquidsQandT

(Bolingpoints;Q=98°C,T=78°C)

(a)Identifythemistakesinthesetupabove

SECTION A (50 Marks) Yas mathematics family1.Simplify Mathematics Paper 1 Question Paper - 3 marks2.Oketch sells his ...
22/09/2022

SECTION A (50 Marks) Yas mathematics family
1.
Simplify Mathematics Paper 1 Question Paper -

3 marks

2.
Oketch sells his car to Jane and makes a profit of 17%. Jane sells the same car to Issa at Sh.300, 000, making a loss of 10%. Determine the price at which Oketch bought the car.

3 marks

3.
Given Mathematics Paper 1 Question Paper -
and x is an acute angle, find without using tables and calculators Cos x + tan (90-x), leaving your answer in the form Mathematics Paper 1 Question Paper -

3 marks

4.
Mr. Owino spends
1/4 of his salary on school fees. He spends
2/3 of the remainder on food and a fifth of what is left on transport. He saves the balance. In a certain month he saved Sh.3400.

What is his salary?

3 marks

5.
A straight line passes through points A (-2, 6) and B (4, 2). a) M is the midpoint of line AB. Find the co-ordinates of M.

3 marks

6.
Without using tables or calculator evaluate Mathematics Paper 1 Question Paper

3 marks

7.
In a book store, books packed in cartons are arranged in rows such that there are 50 cartons in the first row, 48 cartons in the next row, 46 in the next and so on. a) How many cartons will be there in the 8th row?

b) If there are 20 rows in total, find total number of cartons in the book store.

4 marks

8.
A rectangle whose area is 96m2 is such that its length is 4m longer than its width. Find a) Its dimensions

b) Its perimeter

3 marks

9.
Evaluate Mathematics Paper 1 Question Paper

2 marks

10.
In triangle ABC below, AC=BC, AB is parallel to DE, AB=15cm, DE=7.5cm and BE=6cm.

Mathematics Paper 1 Question Paper

Calculate

a) Length CE

b) Area of quadrilateral ABED.

4 marks

11.
A salesman gets a commission of 2.4% on sales up to sh.100, 000.He gets additional commission of 1.5% on sales above this. Calculate the commission he gets for sales worth sh.280, 000.

3 marks

12.
A bus and a car leave Nairobi at 7.30am and 9.30am respectively. If their speeds are 60km/h and 100km/h respectively, find the time when the car catches up with the bus.

3 marks

13.
The table below shows the number of children per house in a certain village.

Mathematics Paper 1 Question Paper

Calculate

(i) The mean number of children per house to the nearest whole number.

(ii) The median

4 marks

14. Solve the inequality below and state the integral values of your solution.

Mathematics Paper 1 Question Paper

3 marks

15.
A measuring cylinder of radius 5cm contains water whose level reads 6cm high. A spherical object is immersed in the water and the new level reads 10cm. Calculate the radius of the spherical obj

3 marks

16.
Solve the equation

Mathematics Paper 1 Question Paper

3 marks

SECTION B (50 Marks)
18.
The table below shows marks scored by a class in a math test.

Mathematics Paper 1 Question Paper

a) Draw a histogram for the distribution above, on a graph paper.

b) i) State the group in which the median lies.
ii) A vertical line drawn through the median mark divides the total area of the Histogram into 2 equal parts. Using the information, estimate the median mark.

10 marks

19.
Karis owns a farm that is triangular in shape as shown below

Mathematics Paper 1 Question Paper

a) Calculate the size of angle BAC.
b) Find the area of the farm in hectares.
c) Karis wishes to irrigate his farm using a sprinkler machine situated in the farm
such that it is equidistant from points A,B and C.
i) Calculate the distance of the sprinkler from point C.

ii) The sprinkler rotates in a circular motion so that the maximum point reached by
the water jets is the vertices A,B, and C. Calculate the area outside his farm that
will be irrigated.

10 marks

20.
The diagram below is a right pyramid on a rectangular base.

Mathematics Paper 1 Question Paper

Given that the volume of the solid is 280m3 and its base area is 60cm2 and that AB:BC=3:5, determine

i) the height of the pyramid.

ii) the length and width of the base.

iii) the slant edge of the pyramid

10 marks

21.
Triangle ABC has vertices A(-5,-3),B(-3,-5) and C(-3,-1).

a) Plot triangle ABC and its image A1B1C1 under reflection in the line y=-x. (3mks)

PASTE GRAPH

b) AIIBIICII is the image of AIBICI under rotation centre (0,0) through a positive quarter turn. Plot A11B11C11 and state its co-ordinates.

c) A3B3C3 with coordinates A3( 7.5,-4.5),B3(4.5,-7.5) and C3(4.5,-1.5) is the image of A11B11C11 under a certain transformation. Plot A3B3C3 and describe this transformation. (2mks)
d) A4(5,-1.5) is the image of A3 under translation. State the co-ordinates of B4
and C4.

10 marks

22. Maru Secondary School consumes 40 bags of maize and 25 bags of beans per term. Kadu Secondary School consumes 35 bags of maize and 18 bags of beans per term. The schools purchase the grains from the same grain store. Maru pays sh.380,000 while Kadu pays sh.301,500 for the grains.

a) Write down two equations representing the cost of grains in the two schools.

b) Using matrix method , calculate the cost of each bag of maize and beans.

c) The following term the price of each bag of maize increased by 20% while that of beans decreased by 15%.

i) How much did Maru pay for the grains?

ii) If the school enrolment increased by 10% and the food ration also increased proportionally, how much would the school spend on the grains?

10 marks

23.
A ship leaves port M and sails on a bearing of 0500 heading towards Island L. Two navy destroyers sail from a noval base N to intercept the ship. Destroyer A sails such that it covers the shortest distance possible. Destroyer B sails on a bearing of 200 to L. If the bearing of N from M is 1000 and distance NM=300Km, Using a scale of 1cm to represent 50Km, determine

i) the positions of M,N and L.

ii) the distance travelled by destroyer A.

iii) the distance travelled by destroyer B.

iv) the bearing of N from L.

10 marks

24.
The table below shows values for the function

Mathematics Paper 1 Question Paper -

a) Complete the table above.

b) Draw the graph of Mathematics Paper 1 Question Paper TESTS 27

PASTE A GRAPH

c) Use your graph to solve the equation. i) 5+8x-2x2=0

ii) -2x2+5x+3=0

d) State the equation of the line of symmetry of the curve y=5+8x-2x2

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