Section 3 Pre/Post Assessment

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. Example: Mixing baking soda and vinegar produces carbon dioxide gas.

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. Example: Melting ice cubes.

Front

What happens to the mass of an ice cream treat left in the sun?

Back

The mass of the ice cream treat will decrease as it melts and evaporates.

Front

What tool is used to measure mass?

Back

A balance scale is used to measure the mass of an object.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass.

Front

What is an example of a physical change?

Back

Dissolving sugar in water is a physical change because the sugar can be recovered.

Front

What is an example of a chemical change?

Back

Burning wood is a chemical change because it produces ash and smoke, which are different substances.

Front

What does it mean if a solution gets warm when mixed?

Back

If a solution gets warm when mixed, it may indicate a chemical reaction is occurring, releasing energy.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass cannot be created or destroyed in a chemical reaction.

Front

What happens to the mass of a substance during a chemical change?

Back

The total mass of the substances before and after a chemical change remains the same.