Chemical Reactions Quiz

What are the signs that a chemical reaction has occurred?

• Change in state

• Fizzing and flames

• Melting

• Freezing

What role do catalysts play in a chemical reaction?

• Slow down the reaction

• Speed up the reaction

• Change the products

• Change the reactants

In the equation magnesium + oxygen → magnesium oxide, what are the reactants?

• Magnesium oxide

• Magnesium and oxygen

• Oxygen and magnesium oxide

• Magnesium only

What is another word for burning?

• Freezing

• Melting

• Combustion

• Evaporation

What are the products of the decomposition of calcium carbonate?

• Calcium and carbon dioxide

• Calcium oxide and carbon dioxide

• Calcium oxide and oxygen

• Calcium and oxygen

What is the result of placing a lighted spill near hydrogen gas?

• Relights the spill

• Squeaky pop

• Limewater turns milky

• No reaction

What is the law for the conservation of mass?

• Mass of reactants > mass of products

• Mass of reactants < mass of products

• Mass of reactants = mass of products

• Mass of reactants ≠ mass of products

What is an example of an exothermic reaction?

• Melting ice

• Burning fuels

• Sports ice packs

• Boiling water

What is an example of an endothermic reaction?

• Burning fuels

• Freezing water

• Sports ice packs

• Condensation