Chapter 7 Review 2024

Front

What is a chemical change?

Back

A chemical change is a process where one or more substances are transformed into new substances with different properties, often involving heat and light, such as in a fireworks show.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition, such as changing shape or state.

Front

What density will an object need to float on water?

Back

An object must have a density less than 1 g/cm³ to float on water.

Front

What is the density of water?

Back

The density of water is 1 g/ml.

Front

What are physical properties?

Back

Physical properties are characteristics of a substance that can be observed or measured without changing the substance into a new one, such as color, shape, and density.

Front

What indicates a physical change?

Back

A change in shape indicates a physical change.

Front

What is an example of a chemical change?

Back

An example of a chemical change is the burning of wood, which produces ash and smoke.

Front

What happens during a physical change?

Back

During a physical change, the form of a substance changes, but its chemical identity remains the same.

Front

What is the difference between physical and chemical changes?

Back

Physical changes do not alter the chemical composition of a substance, while chemical changes result in the formation of new substances.

Front

What is condensation?

Back

Condensation is the process by which water vapor in the air is changed into liquid water, often seen as droplets on a cold surface.