Y8 Patterns of Reactivity Quiz

What is an acid?

• A substance that turns red litmus paper blue

• A substance with a pH of between 0 and 6

• A substance that has a pH greater than 7

• A substance that is neutral

Give two examples of acidic substances.

• Sodium hydroxide and potassium hydroxide

• Hydrochloric acid and sulfuric acid

• Water and salt

• Ammonia and baking soda

What is a base?

• A substance that neutralises an acid

• A substance that turns blue litmus paper red

• A substance that has a pH less than 7

• A substance that is neutral

Give two examples of basic substances.

• Hydrochloric acid and sulfuric acid

• Water and salt

• Sodium hydroxide and potassium hydroxide

• Ammonia and baking soda

What is combustion?

• A process of breaking down compounds using heat

• A chemical reaction where fuel is burned and reacts with oxygen to release energy.

• A process of dissolving a solid into a liquid

• A reaction that occurs without oxygen

Give the word and symbol equation for magnesium burning in oxygen.

• Magnesium + Oxygen -> Magnesium oxide; Mg + O -> MgO

• Magnesium + Oxygen -> Magnesium oxide; Mg + O2 -> MgO2

• Magnesium + Oxygen -> Magnesium oxide; Mg + O2 -> MgO

• Magnesium + Oxygen -> Magnesium oxide; Mg + O2 -> MgO2

Define exothermic.

• A reaction that absorbs heat

• A reaction that releases heat

• A reaction that occurs without heat

• A reaction that involves light

Define endothermic.

• A reaction that absorbs heat

• A reaction that releases heat

• A reaction that occurs without heat

• A reaction that involves light

What does thermal decomposition mean?

• The process of a substance breaking down into simpler substances when heated

• The process of a substance combining with oxygen

• The process of a substance dissolving in water

• The process of a substance reacting with an acid

What is the equation for the thermal decomposition of copper carbonate?

• CuCO3 -> Cu + CO2

• CuCO3 -> CuO + CO2

• CuCO3 -> CuO + O2

• CuCO3 -> Cu + O2