Grade 8 Science Quiz

What is the most reactive metal in the reactivity series?

• Gold

• Iron

• Copper

• Potassium

Which of the following metals reacts with water?

• Gold

• Sodium

• Copper

• Zinc

What is produced when an acid reacts with a metal?

• Hydrogen and nitrogen

• Water and carbon dioxide

• Salt and hydrogen

• Salt and oxygen

What is the term for a reaction that absorbs heat?

• Endothermic

• Exothermic

• Oxidation

• Combustion

What happens to gas pressure when the temperature increases?

• It fluctuates

• It increases

• It remains the same

• It decreases

Which of the following is a characteristic of physical changes?

• Chemical bonds are broken

• No new substances are made

• Energy changes occur

• New substances are formed

What is the main cause of evaporation?

• Density

• Heat

• Pressure

• Volume

What is the purpose of a catalyst in a chemical reaction?

• To increase temperature

• To decrease pressure

• To change the products

• To lower activation energy

What is the chemical equation for complete combustion of hydrocarbons?

• Hydrocarbon + oxygen -> carbon dioxide + water

• Hydrocarbon + nitrogen -> carbon dioxide + water

• Hydrocarbon + hydrogen -> carbon dioxide + water

• Hydrocarbon + oxygen -> carbon + water

What is the main product of incomplete combustion?

• Carbon dioxide

• Carbon monoxide

• Hydrogen

• Water