Grade 4 & 5 Chemistry: Free Trial*

G. 10 & 11

Chemistry

F. 4 & 5

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G. 10 & 11 / F. 4 & 5

Chemistry: Free Trial*

MCQs

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1 / 10

1. Covalent bonding occurs when what type of atoms join?

A. Metal and a noble gas

B. Non-metal and non-metal

C. Metal and non-metal

D. Metal and metal

2 / 10

2. $\Delta$H is positive for what type of reactions?

A. Displacement

B. Exothermic

C. Oxidation

D. Endothermic

3 / 10

3. When an exothermic reaction takes place, the reaction mixture gives out heat because...

A. energy is always absorbed in a chemical change, which makes new substances

B. the radiation energy produced by the reaction has to be gotten rid of via diffusion

C. in an exothermic change, the products are less stable than the reactants

D. more energy is released when new bonds are formed than is taken in when existing bonds in the reactants are broken

4 / 10

4. I have 2 $dm^{3}$ of carbon dioxide gas at room temperature and pressure. How many moles do I have?

A. 0.045

B. 12.0

C. 0.083

D. 88.0

5 / 10

5. Salts can also be made by reacting metals with acids. What gas is given off when a metal reacts with an acid?

A. Hydrogen

B. Oxygen

C. Nitrogen

D. Carbon dioxide

6 / 10

6. What type of structure does the carbon in diamond form?

A. Giant structure

B. Covalent bond

C. Ionic bond

D. Giant covalent structure

7 / 10

7. The type of bonding that holds the atoms together in salt is...

A. hydrogen

B. covalent

C. metallic

D. ionic

8 / 10

8. At equilibrium, the amount of product(s) and reactant(s) is constant. Which of the following would increase the amount of product in a reaction?

A. Remove the product from the reaction vessel

B. Add more product to the reaction vessel

C. Increase the pressure of the reaction vessel

D. Increase the temperature of the reaction mixture

9 / 10

9. When an atom loses or gains electrons, it becomes...

A. an electrolyte

B. a bond

C. a compound

D. an ion

10 / 10

10. Choose the correctly balanced chemical equation from the list.

A. $NaBr + Cl_{2} \longrightarrow NaCl + Br_{2}$

B. $3NaBr + Cl_{2} \longrightarrow 3NaCl + Br_{2}$

C. $2NaBr + Cl_{2} \longrightarrow 2NaCl + Br_{2}$

D. $2NaBr + Cl_{2} \longrightarrow NaCl + Br_{2}$

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