Understanding Changes in Matter

What is a chemical change?

• A chemical change is a process that only involves mixing substances without any reaction.

• A chemical change is a reversible process that does not alter the substance.

• A chemical change is a physical alteration of the state of matter.

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

What happens to the molecules during a chemical change?

• Molecules only change color without altering structure.

• Molecules remain unchanged during a chemical change.

• Molecules combine without breaking any bonds.

• Molecules undergo rearrangement of atoms, breaking and forming bonds, resulting in new substances.

Give an example of a physical change.

• Melting ice into water

• Burning wood to ash

• Dissolving sugar in water

• Freezing water into ice

What is one indicator of a chemical change?

• Temperature increase

• Change in color

• Formation of a solid

• Production of gas

How can you tell if a physical change has occurred?

• A physical change has occurred if there are changes in state, shape, size, or appearance without altering the chemical composition.

• A physical change can only be identified by measuring temperature.

• A physical change involves a change in chemical composition.

• A physical change is indicated by the release of gas or heat.

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

• Both chemical and physical changes produce new substances.

• A chemical change produces new substances; a physical change does not.

• A chemical change is reversible; a physical change is not.

• A physical change alters the chemical composition; a chemical change does not.

Name a common example of a chemical change.

• Melting of ice

• Dissolving sugar in water

• Rusting of iron

• Boiling water

What happens to the properties of a substance during a chemical change?

• The properties remain unchanged throughout the process.

• The properties of a substance change, resulting in new substances with different characteristics.

• Chemical changes do not affect the physical state of a substance.

• The original substance is preserved without any alteration.

Is melting ice a chemical or physical change?

• Chemical change

• No change at all

• Evaporation process

• Physical change

What is an example of a chemical change that occurs in cooking?

• Frying an egg, where the egg whites solidify.

• Baking bread, where yeast ferments sugars.

• Boiling water, which changes its temperature.

• Grilling vegetables, which enhances their flavor.