5th Grade Physical and Chemical Changes

What is evaporation?

• The process of water turning into ice when cooled.

• The process by which liquid water changes into water vapor (gas) when it is heated.

• The process of water being absorbed by soil.

• The process of water flowing from one place to another.

How can you separate a mixture of sand and water?

• By evaporating the water

• By filtering the mixture

• By mixing it with oil

• By freezing the mixture

What is the role of heat in chemical reactions?

• Heat is not involved in chemical reactions.

• Heat can provide the energy needed to initiate a chemical reaction and can also affect the rate of the reaction.

• Heat only increases the temperature of the reactants without affecting the reaction.

• Heat is a byproduct of all chemical reactions.

What are some clues that a chemical change has occurred?

• Color change, production of gas, formation of a precipitate, and change in temperature.

• Change in pressure, increase in volume, formation of a solid, and change in color.

• Absorption of light, change in mass, evaporation of liquid, and formation of bubbles.

• Change in state, mixing of substances, increase in density, and change in shape.

What is a precipitate?

• A gas that forms during a chemical reaction.

• A solid that forms and settles out of a liquid mixture during a chemical reaction.

• A liquid that evaporates during a chemical reaction.

• A color change that occurs during a chemical reaction.

What is condensation?

• The process of water vapor cooling and changing back into liquid water.

• The process of liquid water evaporating into water vapor.

• The process of ice melting into liquid water.

• The process of water being absorbed by soil.

What is a chemical change?

• A change that results in the formation of new chemical substances.

• A physical change that does not alter the chemical composition.

• A process that only involves the mixing of substances without any reaction.

• A change that can be easily reversed without any new substances formed.

What happens during the freezing process?

• A liquid changes into a gas as it gains heat energy.

• A liquid changes into a solid as it loses heat energy.

• A solid changes into a liquid as it gains heat energy.

• A gas changes into a liquid as it loses heat energy.

What is the significance of bubbles in a chemical reaction?

• They indicate the presence of a solid.

• They often indicate the production of gas, which is a sign of a chemical change.

• They show that the reaction is exothermic.

• They suggest that the reaction is reversible.

What is the difference between a physical change and a chemical change?

• A physical change alters the chemical identity of a substance.

• A chemical change does not affect the physical properties of a substance.

• A physical change does not change the substance's chemical identity, while a chemical change results in new substances being formed.

• A chemical change can be easily reversed, while a physical change cannot.