Evidence of Chemical Changes

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances with different properties.

Front

What evidence indicates a chemical reaction has occurred?

Back

Evidence of a chemical reaction includes gas production, color change, temperature change, and the formation of a precipitate.

Front

What happens to sugar when it is heated and burns?

Back

When sugar is heated and burns, it undergoes a chemical change, producing gas and turning black.

Front

What is the brown color of a cut apple an example of?

Back

The brown color of a cut apple is an example of a chemical change due to oxidation.

Front

What is produced when baking soda reacts with vinegar?

Back

When baking soda reacts with vinegar, it produces carbon dioxide gas, which causes fizzing and bubbling.

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.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

Front

What is a gas?

Back

A gas is a state of matter that has no fixed shape and can expand to fill its container.

Front

What is a precipitate?

Back

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

Front

What does it mean when a substance is oxidized?

Back

Oxidation is a chemical reaction that involves the loss of electrons or an increase in oxidation state.