SENAM's Science class

Rutherford's Atomic model:

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*🔯CHEMISTRY.*

Some Chemicals In The Science 🧪 Laboratory And Their Common Names:

☆Ordinary salt ➠ NaCl
✶ baking soda ➠ NaHCO₃
✶ Wash the soda ➠ Na₂CO₃ · 10H₂O
✶ Caustic soda ➠ NaOH
✶ Suhga ➠ Na₂B₄O₇ · 10H₂O.
✶ alum➠ K₂SO₄ · Al₂ (SO₄) ₃ · 24H₂O
✶ red medicine ➠ KMnO₄
✶ Caustic potash ➠ KOH
✶ Shura ➠ KNO₃
✶ Bleach bleaching ➠ Ca (OCl) · Cl
✶ Lime water ➠ Ca (OH) ₂
✶ Gypsum ➠ CaSO₄ · 2H₂O
✶ Plaster of Paris➠ CaSO₄ · ½H₂O
✶ Choke ➠ CaCO₃
✶ limestone ➠ CaCO₃
✶ marble ➠ CaCO₃
✶ Salon ➠ NH₄Cl
✶ Laughing gas ➠ N₂O
✶ Litharge ➠ PbO
✶ Galena ➠ PbS
✶ red vermilion ➠ Pb₃O₄
✶ white lead ➠2PbCO₃ · Pb (OH) ₂
✶ salt acid ➠ HCl
✶ Shure Acid ➠ HNO₃
✶ Acarus ➠ HNO₃ + HCl (1: 3)
✶ dry ice ➠ CO₂
✶ green clasp ➠ FeSO₄ · 7H₂O
✶ Horn Silver ➠ AgCl
✶ heavy water ➠ D₂O
✶ Producer gas ➠ CO + N₂
✶ vinegar ➠ CH₃COOH
✶ gamaxine ➠ C₆H₆Cl₆
✶ Blue Kassis ➠ CuSO₄ · 5H₂O
✶ alcohol ➠ C₂H₅OH
✶ Manda ➠ C₆H₁₀O₅
✶ Grapes juice ➠ C₆H₁₂O₆
✶ Chinese ➠ C₁₂H₂₂O₁₁
✶ Urea ➠ NH₂CONH₂
✶ benzene ➠ C₆H₆
✶ turpentine oil ➠ C₁₀H₁₆.

Some chemical elements, and why they have UNFAMILIAR chemical symbols:

Element Latin Name Symbol

Sodium Natrium Na
Potassium Kalium K
Copper Cuprum Cu
Iron Ferrum Fe
Gold Aurum Au
Silver Argentum Ag
Lead Plumbum Pb
Mercury Hydrargyrum Hg
Tin Stannum Sn

QUESTION:
In ion electron method of balancing
equations, how oxygen is balanced?

a. O is balanced by adding O.
b. O is balanced by adding H2O.
c. O is balanced by adding OH-
d. All the ways are used.

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゚ ゚viral

QUESTION:
Below is a diagram of the female reproductive system of humans.
Study it carefully and answer the questions which follow.

I. Name the parts labeled A, B, C and D.
[4 marks]

II. State one (1) function of each of the
parts labeled B and D. [4 marks]

III. State one (1) disease or disorder that
affects the part labeled D in the diagram.
[1 mark]

IV. Which of the parts A, B, C, and D on
the diagram helps in the production of
secretions such as oestrogen, androgen,
etc. in the female reproductive system?
[1 mark]

゚
゚viral

QUESTION:

The product of X and 42 added to the difference between 437 and 256 is equal to 937. Find the value
of X.

Answers/Solution to the questions posted on Thursday, 07/04/2023 at 12:02 PM.
.....................................
SOLUTION :
-------------------
Data;
---------
*mass, m of the mango fruit=5000g=5kg,
*height, h of the mango fruit from the ground=10m,
*velocity, v of the mango fruit in flight= 5m/s,
*acceleration due to gravity, g=10 m/s².

Then;
A. Kinetic energy, K.E. of the mango fruit in
1
flight = ----mv² ✅ for 0.5mark
2

1 ✅ for 0.5mark 125
===>K.E.= ------(5kg)(5m/s)² = --------
2 2

===>K.E.=62.5 J ✅ for 1mark for both correct
figure & S.I. Unit.

B.(I) Potential energy, P.E. of the mango fruit at maximum height=m×g×h=mgh ✅ for 0.5mark.

===>P. E.= (5kg)(10m/s²)(10m) ✅ for 0.5mark.

===>P. E.= 500 J ✅ for 1mark for both correct
figure & S.I. Unit.

B.(II) Potential energy, P.E. of the mango fruit after it landed implies/means, that height, h=0.

✅ for 0.5mark
But P. E. = m×g×h = mgh, & h = 0 in this case,

✅ for 0.5mark.
===> P. E. = (5kg)(10m/s²)(0)

===> P. E. = 0 J ✅ for 1mark with or without
the S.I. Unit.

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