Unit 5 Practice

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 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 happens when sugar dissolves in water?

Back

When sugar dissolves in water, a physical change occurs because the sugar molecules disperse in the water but do not change chemically.

Front

Can matter be created or destroyed?

Back

No, matter is always conserved; it cannot be created or destroyed, only transformed.

Front

What is an example of a chemical change?

Back

An example of a chemical change is a candle burning, where wax is transformed into carbon dioxide and water.

Front

What is an example of a physical change?

Back

An example of a physical change is ice melting into water, where the state changes but the substance remains H2O.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What occurs during wood burning?

Back

During wood burning, a chemical change occurs as wood reacts with oxygen to form ash, carbon dioxide, and water.

Front

What is the difference between a physical and chemical change?

Back

A physical change alters the form or appearance of a substance without changing its identity, while a chemical change results in the formation of new substances.

Front

What is an example of a substance changing state?

Back

An example of a substance changing state is water freezing into ice, which is a physical change.