Science Quiz on Phase Changes and Chemical Reactions

What is a phase change?

• A change in state or form with no new substance formed

• A chemical reaction involving new substances

• A change in temperature only

• A change in color

Who is credited with the Law of the Conservation of Mass?

• Antoine Lavoisier

• Isaac Newton

• Albert Einstein

• Marie Curie

What is a sign that a chemical reaction may have occurred?

• Change in temperature

• Change in size

• Change in shape

• Change in texture

What remains constant during a chemical or physical change?

• Mass

• Volume

• Temperature

• Color

What is an example of a physical change?

• Melting ice

• Burning wood

• Rusting iron

• Baking a cake

What is an exothermic reaction?

• A reaction that absorbs heat from its environment

• A reaction that releases heat to its environment

• A reaction that involves light emission

• A reaction that changes color

Which of the following is an example of chemiluminescence?

• Burning wood

• Rusting iron

• Bending a glowstick

• Mixing baking soda and lemon juice

What is the balanced chemical equation for the formation of rust?

• 2Fe + 3O₂ → 2FeO₃

• 4Fe + 3O₂ + 6H₂O → 4Fe(OH)₃

• Fe + O₂ → FeO₂

• 3Fe + 4O₂ → 3FeO₄

What gas is produced when baking soda reacts with lemon juice?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

What is a chemical equation used to represent?

• A mathematical calculation

• A chemical reaction

• A physical change

• A biological process