Front

What is the law of conservation of matter?

Back

The law of conservation of matter states that matter cannot be created or destroyed in a chemical reaction; it can only change forms.

Front

Why do scientists believe the law of conservation of matter is always true?

Back

Scientists assume it is true because it has been observed repeatedly in experiments.

Front

What happens to matter during a state change?

Back

No matter is gained or lost during a state change; it only changes form.

Front

What occurs when substances are mixed together?

Back

The total weight of the mixture is the sum of the weights of the individual substances.

Front

What happens to the weight of a mixture when heated?

Back

The weight may decrease if substances like water evaporate during heating.

Front

What can happen to particles during a chemical reaction?

Back

The particles can rearrange to form new substances.

Front

What is an example of a state change?

Back

Ice melting into water is an example of a state change.

Front

How can the scale affect measurements in experiments?

Back

If the scale is not calibrated correctly, it may give inaccurate measurements of weight.

Front

What is an example of matter being conserved?

Back

When a candle burns, the wax is transformed into gases and heat, but the total mass remains the same.

Front

What is evaporation?

Back

Evaporation is the process where liquid turns into gas, often resulting in a loss of weight.