Chemical and Physical Properties and Changes

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances, involving the rearrangement of atoms.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical property?

Back

A characteristic of a substance that describes its ability to change into different substances, such as reactivity with acid.

Front

What is a physical property?

Back

A characteristic of a substance that can be observed or measured without changing the substance's identity, such as color, density, or mass.

Front

What evidence indicates a chemical change?

Back

Signs include color change, gas production, temperature change, and the formation of a precipitate.

Front

What is density?

Back

Density is the mass of a substance divided by its volume, often expressed in grams per cubic centimeter (g/cm³).

Front

What happens to bonds during a chemical change?

Back

Bonds between atoms are broken and new bonds are formed, resulting in the creation of new substances.

Front

What is reactivity with acid?

Back

A chemical property that describes how a substance reacts when it comes into contact with an acid, often producing gas or other products.

Front

What is an example of a physical change?

Back

Melting ice into water is a physical change because it alters the state of the substance without changing its chemical identity.

Front

What is an example of a chemical change?

Back

Combining vinegar and baking soda produces carbon dioxide gas, indicating a chemical change.