Scope 4 Test Review

Front

What is a chemical reaction?

Back

A process that involves the transformation of one or more substances into different substances, resulting in the formation of new chemical compounds.

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 happens when two clear liquids are mixed and a yellow solid forms?

Back

This indicates a chemical reaction has occurred, resulting in the formation of a new substance.

Front

What is an example of a physical change?

Back

Dissolving sugar in water, where the sugar retains its chemical identity.

Front

What indicates that a chemical reaction has taken place?

Back

The creation of a new substance, which can be identified by changes in color, temperature, or the formation of gas.

Front

What is the significance of temperature change in a chemical reaction?

Back

A temperature change can indicate that a chemical reaction has occurred, as energy is either absorbed or released.

Front

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

Back

A chemical change results in the formation of new substances, while a physical change does not alter the chemical identity of the substance.

Front

What are some signs that a chemical reaction has occurred?

Back

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

Front

What is a precipitate?

Back

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

Front

Can a physical change be reversed?

Back

Yes, many physical changes are reversible, such as freezing and melting.