Elements Compounds and Mixtures
Q.1. Define the following:
i. Element
ii. Compound
iii. Decantation
iv. Evaporation
v. Homogeneous mixture
vi. Heterogeneous mixture vii. Sublimation
Q.2: How can you separate the following mixtures:
i. Common salt and water.
ii. kerosene oil and water
iii. ammonium chloride and sand
iv. Tea leaves from tea
v. sand from water
Q.3; Explain the process of following with diagrams:
i. Sublimation
ii. Separating Funnel
Q.4: Define Pure Substances. State two characteristics of Pure substance.
Q.5: Define Mixture. State two characteristics of Mixtures
Atomic Structure
Q.1: Define the following:
i. Electrons
ii. protons
iii. Neutrons iv. atomic number
v. mass number
vi. Valence electrons vii. Valency
viii. Isotopes ix. Radioactivity x. Alpha particle
Q.2: Write the electronic configuration of the following:
i. Be (4)
viii. Ca(20)
ii. N (7)
iii. O (8)
ix. K (19) x. Cl (17)
iv. Na (11)
v. Ar (18)
vi. F(9) vii. C(6)
Q.3: Explain the formation of the following :
i. Na+ from Na
ii. Mg2+ from Mg
iii. O2- from O
Q.4. Write two advantages and two disadvantages of radioactivity.
Q.5: What kind of ions are formed by
i. Metals and
ii. Non-metals.
Q.6: Differentiate between cations and anions
Q. 7: In AXz
what is A and Z ?
Q.8: What are isotopes? Name two properties of isotopes?
iv. Cl- from Cl
LANGUAGE OF CHEMISTRY
Q.1: What is a chemical symbol? Write symbols for the following:
i. Sodium ii. Potassium iii. Oxygen iv. Carbon v. Nitrogen vi. Fluorine vii. Hydrogen
viii. Chlorine ix. Argon x. Calcium xi. Lead xii. Iron xiii. Silver xiv. Gold xv Magnesium
Q.2: What is a balanced Chemical equation? Balance the following equation:
i. N2 + H2→ NH3
ii. Zn + HCl → ZnCl2 + H2
iii. PbO + C → Pb + CO2
iv. CaO + H2O → Ca(OH)2
v. H2 + Cl2 → HCl
vi. Na + H2O → NaOH + H2
vii Fe + HCl → FeCl3 + H2
viii Mg + O2 → MgO
ix. Fe + CuSO4 →FeSO4 + Cu
x. H2 + O2 → H2O
Q.4: Write three informations conveyed by a balanced chemical equation.
Q.5: Write the law of conservation of mass.
Q.6: Define Valency? What is the valency of:
I, iron in
a. FeO
ii. copper in a. CuO
b. Fe2O3
b. Cu2O
Q.7: What is radical?
Q.8: Write chemical formula of the following
i. Sodium chloride ii. Sodium hydroxide iii. Sodium carbonate iv. Calcium carbonate
v. calcium hydroxide vi Potassium hydroxide vii. Ferrous chloride viii. Ferric Chloride
ix. Magnesium oxide x. Magnesium carbonate
CHEMICAL REACTIONS
Q.1: Define : i. Reactant ii. Product iii. Catalyst iv. endothermic reactions
v. exothermic reactions
Q.2: Write the four different types of reactions. Give one example each.
Q.3. What are i. Neutralization reactions and ii. Precipitation reaction Give one
example of each.
Q.4: Give examples of i. acidic oxide ii. basic oxide iii. Neutral oxide iv. amphoeteric
oxide v. an oxidizing reaction vi. A reducing agent
q.5: Identify the type of reaction in following:
i. Fe + 2HCl → FeCl2 + H2
ii. C + O2
CO2 + Heat
iii. 2KClO3
2KCl + 3O2
heat
iv. H2SO4 + BaCl2 → BaSO4 + 2HCl
v. Zn(s) + AgNO3 (aq)
AgCl(s) + ZnNO3(aq)
vi. Fe + CuSO4(aq)
FeSO4 + Cu
vii. BaCl2 + H2SO4
viii. 2Mg + O2 → 2MgO
BaSO4 + 2HCl
ix. 2KClO3 + heat → 2KCl
x. HCl + NaOH → NaCl + H2O
CARBON AND ITS COMPOUNDS
Q.1. Define the following: a. Allotropy b. Fullerene c. Destructive distillation d.
Crystalline form e. Amorphous form
Q.2. Write three differences between Diamond and Graphite.
Q. 3. Why does Graphite conduct electricity but Diamond does not?
Q.4. Name the allotrope of carbon used in the following:
i. Dry cell. ii cosmetics iii. water gas. iv. gas masks. v. sugar industry vi. Gun powder vii.
acidity tablets viii. Electrodes. . ix cutting hard metals x. Jewellery xi dry lubricant.
xii. superconductor.
Q.5: What is Destructive distillation? Write the products of destructive distillation of coal.
Q.6. How is Lamp black prepared ?
Q.7: What is activated charcoal?
HYDROGEN
Q.1Write balanced equation for the reaction of following metals with water:
i. Na, ii. K iii. Ca
Q.2: Write balanced equation for the reaction of following metals with steam:
i. Mg, ii. Al
Q.3: Write balanced equation for the reaction of following metals with HCl:
i. Zn
ii. Fe iii. Cu