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. Choose the correctly balanced chemical equation from the list.

A. $TiCl_{4} + H_{2} \longrightarrow TiO_{2} + HCl$

B. $TiCl_{4} + H_{2}O \longrightarrow TiO + 4HCl$

C. $TiCl_{4} +2H_{2}O \longrightarrow TiO_{2} + 4HCl$

D. $TiCl_{4} + 3H_{2} \longrightarrow TiO_{2} + 5HCl$

2 / 10

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

A. $Na_{3}PO_{4} + HCl \longrightarrow NaCl + H_{3}PO_{4}$

B. $Na_{3}PO_{4} + 3HCl \longrightarrow 3NaCl + H_{3}PO_{4}$

C. $Na_{3}PO_{4} + 2HCl \longrightarrow 3NaCl + H_{3}PO_{4}$

D. $3Na_{3}PO_{4} + 3HCl \longrightarrow 3NaCl + H_{3}PO_{4}$

3 / 10

3. Which of the following reactions is exothermic?

A. Photosynthesis

B. Ammonium nitrate $+$ water

C. Ethanoic acid + sodium carbonate

D. Combustion

4 / 10

4. Energy changes in chemical reactions are measured in...

A. kJ

B. kWh

C. Joules

D. $kJmol^{-1}$

5 / 10

5. I make some ethyl ethanoate by reacting ethanol and ethanoic acid. Before carrying out the reaction, I had calculated that I should be able to make 3.2g of my product. However, on weighing my purified product, I find that I only have 1.8g. What is the percentage yield for my reaction?

A. 177.78$\%$

B. 56.25$\%$

C. 50.00$\%$

D. 5.76$\%$

6 / 10

6. Which of these reactions has an atom economy of $100\%$?

A. $NaOH + HCl \longrightarrow NaCl + H_{2}O$

B. $CaCO_{3} \longrightarrow CaO + CO_{2}$

C. $C_{2}H_{4} + Br_{2} \longrightarrow C_{2}H_{4}Br_{2}$

D. $CaCO_{3} + HCl \longrightarrow CaCl_{2} + H_{2}O + CO_{2}$

7 / 10

7. What is the electronic configuration for an $O^{2-}$ ion?

A. 2:7

B. 2:8

C. 2:8:2

D. 2

8 / 10

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

A. ionic

B. covalent

C. hydrogen

D. metallic

9 / 10

9. What is an alkali?

A. A substance that produces H+ ions when added to water

B. A substance that will neutralize an acid

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

D. A soluble base

10 / 10

10. What is an acid?

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

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

C. A substance that will neutralize an acid

D. A soluble base

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