ADSS Onitsha

CHEMISTRY-OBJ
01-10: EECBBAEBBB
11-20: DDDBEAEABB
21-30: DBECCDAAAB
31-40: BADCBACDAC
41-50: CECCEADBDC
51-60: CEBEEDDBAE

Completed.
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CHEMISTRY-THEORY

(1ai)
(i) Base has bitter taste
(ii) Base is soapy to touch
(iii) Base turns litmus paper blue

(1aii)
The steps involved are:
(i)Shift conversion
(ii)Removal of carbon (iv) oxide
(iii)Steam reforming

(1aiii)
Cracking is the process by which heavier hydrocarbon molecule is splitted into two or more lighter molecules

(1aiv)
Thermal cracking

(1bi)
P ion = 1s²2s²2p⁶

(1bii)
Formula of chloride is Pcl2

(1biii)
Reducing agent
This is because it undergoes oxidation by losing electrons

(1ci)
Electron affinity is the energy released when a gaseous atom gains an electron to form a gaseous negative ion.

(1cii)
This is because it has lone pairs of electrons

(1di)
(i) By adding a catalyst

(ii) FeS(s) + 2HCl(g) -----> FeCl(g) + H2S(s)

Xg = ?
No. of FeCl2 = 127g/mole
No. of FeS= 88g/mole

Mole = Mass/ No. of Mass = 3.2/127 = 0.025mole of FeCl2

By comparison,
1 mole of FeS = 1 mole of FeCl2
X moles of FeS = 0.025 of FeCl2
X = 0.025mole of FeS

Recall,
Mass = Mole * molar mass
Mass = 0.025*88
Mass = 2.2g of FeS
X = 2.2g

(1dii)
(i)Chlorofluorocarbons
(ii)Ammonia
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(2ai)
(i)Molecules of gases are in constant random motion
(ii)The collision of gases is perfectly elastic
(iii)An increase in temperature leads to an increase in the average kinetic energy of the molecules of gases

(2aii)
(i)They both turn blue litmus paper red
(ii)They both dissolve in water to produce an acid

(2aiii)
Copper 2KNO2(s) + O2(g)

(NH)CO3(s) ------>2NH3(g) + CO2(g) + H2O(g)

(iii) No. of molecules = 4/16 × 6.02 × 10²³
= 1.5 × 10²³

(4di)
(i)Sodium
(ii)Potassium

(4dii)
(i)Carbon (iv) oxide
(ii)Carbon

(4diii)
(i)Hydration
(ii)Oxidation
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(5ai)
Gay Lussac states that when gases react, they do so in volume which bears a simple whole-number ratio to one another and the volume of their products.

(5aii)
2CO + O2 ----> 2CO2
2 1 2
100cm³ 70cm³ 100cm³

Total volume = 100+70+100 = 270cm³

(5bi)
(i)It is used in the production of other chemical substances
(ii)It is used as a drying or dehydrating agent

(5bii)
(i) ZnCO3 -----> ZnO + CO2

->Conditions ZnSO4 + H2

->Conditions

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(6a)
Money is an economic unit that functions as a generally recognized medium of exchange for transactional purposes in an economy. ... Money can be: market-determined, officially issued legal tender or fiat moneys, money substitutes and fiduciary media, and electronic cryptocurrencies.

(6bi)
value of money, then, is the quantity of goods in general that will be exchanged for one unit of money. The value of money is its purchasing power, i.e., the quantity of goods and services it can purchase.

(6bii)
demand for money is the desired holding of financial assets in the form of money. In othet words that is, cash or bank deposits rather than investments.

(6c)
(i)The price of the good or service.
(ii)The income of buyers.
(iii)The prices of related goods or services—either complementary and purchased along with a particular item, or substitutes and bought instead of a product.
(iv)The tastes or preferences of consumers will drive demand.

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