Chemistry Language Of Chemistry Exercise 1c
Please Select
1 Fill in the blanks
a) Dalton used symbol _____ for oxygen _______ for hydrogen.
b) Symbol represents _______ atom(s) of an element.
c) Symbolic expression for a molecule is called ________.
d) Sodium chloride has two radicals. Sodium is a ________ radical, while chloride is a ___ radical.
e) Valency of Phosphorous in PCl3 is _____, in PCl5 is _____.
f) Valency of iron in FeCl2 is ____ and in FeCl3 it is _____.
g) Formula of iron (III) carbonate is ______.
Solution :
2 Complete the following table
Acid Radical →
Basic radical
↓ Chloride Nitrate Sulphate Carbonate Hydroxide Phosphate Magnesium MgCl2 Mg(NO)2 MgSO4 MgCO3 Mg(OH)2 Mg3(PO4)2 Sodium Zinc Silver Ammonium Calcium Iron (II) Potassium
| Acid Radical → Basic radical ↓ | Chloride | Nitrate | Sulphate | Carbonate | Hydroxide | Phosphate |
|---|---|---|---|---|---|---|
| Magnesium | MgCl2 | Mg(NO)2 | MgSO4 | MgCO3 | Mg(OH)2 | Mg3(PO4)2 |
| Sodium | ||||||
| Zinc | ||||||
| Silver | ||||||
| Ammonium | ||||||
| Calcium | ||||||
| Iron (II) | ||||||
| Potassium |
Solution :
3 Sodium chloride reacts with silver nitrate to produce silver chloride and sodium nitrate
a) Write the equation
b) Check whether it is balanced, if not balance it.
c) Find the weights of reactants and products.
d) State the law that this equation satisfies?
Solution :
4 What information does the following chemical equations convey?
a) Zn + H2SO4 → ZnSO4 + H2
b) Mg + 2HCl → MgCl2 + H2
Solution :
5 a) What are poly-atomic ions? Give two examples
b) Name the fundamental law involved in every equation
Solution :
6 What is the valency of?
a) Fluorine in CaF2
b) Sulphur in SF6
c) Phosphorous in PH3
d) Carbon in CH4
e) Nitrogen in the following compound
i) N2O3 ii) N2O5 iii) NO2 iv) NO
f) Manganese in MnO2
g) Copper in Cu2O
h) Magnesium in Mg3N2
Solution :
,
7 Why should an equation be balanced? Explain with the help of simple equation.
Solution :
8 Write the balanced chemical equations of the following word equations
a) Sodium hydroxide + Sulphuric acid → Sodium Sulphate + Water
b) Potassium bicarbonate + Sulphuric acid → Potassium Sulphate + Carbon di oxide + Water
c) Iron + Sulphuric acid → Ferrous sulphate + Hydrogen
d) Chlorine + Sulphur di oxide + Water → Sulphuric acid + Hydrogen Chloride
e) Silver Nitrate → Silver + Nitrogen di oxide + Oxygen
f) Copper + Nitric acid → Copper nitrate + Nitric oxide + water
g) Ammonia + Oxygen → Nitric oxide + Water
h) Barium chloride + Sulphuric acid → Barium Sulphate + Hydrochloric acid
i) Zinc sulphide + Oxygen → Zinc oxide + Sulphur dioxide
j) Aluminium carbide + Water → Aluminium hydroxide + methane
k) Iron Pyrites + Oxygen → Ferric oxide + Sulphur di oxide
l) Potassium permanganate + Hydrochloric acid → Potassium chloride + Manganese chloride + chlorine + Water
m) Aluminium sulphate + Sodium hydroxide → Sodium sulphate + Sodium meta aluminate + Water
n) Aluminium + Sodium hydroxide + Water → Sodium meta aluminate + Hydrogen
o) Potassium dichromate + Sulphuric acid → Potassium sulphate + Chromium sulphate + Water + Oxygen
p) Potassium dichromate + Hydrochloric acid → Potassium chloride + Chromium chloride+ Water + Chlorine
q) Sulphur + Nitric acid → Sulphuric acid + Nitrogen dioxide + Water
r) Sodium chloride + Manganese dioxide + Sulphuric acid → Sodium hydrogen sulphate + Manganese sulphate + Water+ Chlorine
Solution :
,
9 a) Define atomic mass unit
b) Calculate the molecular mass of the following
i) Na2SO4.10H2O ii) (NH4)2CO3 iii) (NH2)2CO iv) Mg3N2
Give atomic mass of Na = 23, H = 1, O = 16, C = 12, N = 14, Mg = 24, S = 32
Solution :
10 Choose the correct answer from the options given below
a) Modern atomic symbols are based on the methods proposed by
(i) Bohr (ii) Dalton (iii) Berzelius (iv) Alchemist
b) The number of carbon atoms in a hydrogen carbonate radical is
(i) one (ii) two (ii) three (iv) four
c) The formula of Iron(III) Sulphate is
(i)Fe3SO4 (ii) Fe(SO)3 (iii) Fe(SO4)3 (iv)FeSO4
d) In water, the hydrogen-to-oxygen mass ratio is
(i)1:8 (ii) 1:16 (iii) 1:32 (iv) 1:64
(e) The formula of sodium carbonate is Na, CO, and that of calcium hydrogen carbonate is (i)CaHCO3 (ii) Ca(HCO3)2 (iii) CaHCO3 (iv) Ca(HCO)3
Solution :
11 Correct the following statements
(a) A molecular formula represents an element
(b) Molecular formula of water is H2O2
(c) A molecule of Sulphur is monoatomic
(d) CO and Co both represent cobalt
(e) Formula of Iron(III) oxide is FeO
Solution :
12 Calculate the relative molecular masses of:
(a) CHCI3
(b) (NH4)2Cr2O7
(c) CuSO4.5H2O
(d) (NH4)2SO4
(e) CH3COONa
(f) Potassium chlorate
(g) Ammonium chloroplatinate (NH4)2PtCl6
[At. mass: C = 12,H = 1, O = 16, Cl = 35.5, N = 14, Cu = 63.5, S = 32, Na = 23, K = 39, Pt = 195, Ca = 40, P = 31, Mg = 24]
Solution :
,
13 Give the empirical formula of:
(a) Benzene (C6H6) (b) Glucose (C6H12O6) (c) Acetylene (C2H2) (d) Acetic acid (CH3COOH)
Solution :
14 Find the percentage mass of water in Epsom salt MgSO4.7H2O.
Solution :
15 Calculate the percentage of phosphorus in:
(a) Calcium hydrogen phosphate Ca(H2PO4)2
(b) Calcium phosphate Ca3(PO4)2
Solution :
16 Calculate the percentage composition of each element in Potassium chlorate, KClO3.
Solution :
,
17 Urea is a very important nitrogenous fertilizer. Its formula is CH4N2O. Calculate the percentage of carbon in urea. (C = 12, O = 16, N = 14 and H = 1)
Solution :
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