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*

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1 / 10

1. What happens to electrons in covalent bonding?

A. They are added to both atoms' shells

B. They pass from one atom to another

C. They are shared by the atoms

D. They are removed from the atoms' shell

2 / 10

2. Pick the correct combination of properties of most covalent compounds.

A. Non-conductor \\ High boiling points

B. Conductor \\ Low melting points

C. Conductor \\ High melting points

D. Non-conductor \\ Low melting points

3 / 10

3. At the point of equilibrium...

A. the rate of the forward reaction is slower than the rate of the reverse reaction

B. the rate of the forward reaction is greater than the rate of the reverse reaction

C. the rate of the forward reaction is the same as the rate of the reverse reaction

D. the rate of the forward reaction is double the rate of the reverse reaction

4 / 10

4. One example of a reversible reaction is the Haber process. Pick the correct symbol equation for the reaction between hydrogen and nitrogen to produce ammonia in the Haber process.

A. $N_{2} + 3H_{2} \longleftarrow 2NH_{3}$

B. $N_{2} + 3H_{2} \rightleftharpoons 2NH_{3}$

C. $N_{2} + 3H_{2} \longrightarrow 2NH_{3}$

D. $N_{2} + 3H_{2} \rightleftharpoons NH3$

5 / 10

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

A. $PCl_{5} + 4H_{2}O \longrightarrow H_{3}PO_{4} + 5HCl$

B. $PCl_{5} + H_{2}O \longrightarrow H_{3}PO_{4} + HCl$

C. $PCl_{5} + 4H_{2}O \longrightarrow H_{3}PO_{4} + HCl$

D. $PCl_{5} + 4H_{2}O \longrightarrow H_{3}PO_{4} + 5HCl$

6 / 10

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

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

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

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

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

7 / 10

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

A. metallic

B. hydrogen

C. covalent

D. ionic

8 / 10

8. Which element has the electron configuration 2:4?

A. Sodium

B. Carbon

C. Potassium

D. Neon

9 / 10

9. What is an acid?

A. A substance that will neutralize an acid

B. A chemical that changes colour when added to acids and alkalis

C. A soluble base

D. A substance that produces $H^{+}$ ions when added to water

10 / 10

10. Precipitation reactions occur when an insoluble salt is formed. Precipitation reactions can be used in industry to...

A. split large molecules into smaller ones

B. remove unwanted impurities from metals

C. remove metals from their ores

D. remove some substances from waste water

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