Conservation of matter

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 closed system; it can only change forms.

Front

What must matter have to be considered matter?

Back

Matter must have weight and take up space.

Front

If an object is crushed, what happens to its mass?

Back

The mass remains the same; it is conserved.

Front

What happens to the mass of a substance when it changes state (e.g., solid to gas)?

Back

The mass remains the same; it is conserved.

Front

What is an example of a physical change?

Back

Crushing a cookie or melting ice.

Front

What is an example of a chemical change?

Back

Burning wood or rusting iron.

Front

If you have 250 grams of a mixture and separate it, what can you say about the total mass?

Back

The total mass of the separated components will equal the original mass of the mixture.

Front

What happens to the mass of dry ice as it sublimates?

Back

The mass decreases as it turns into gas, but the total mass of the system remains constant.

Front

If Sarah and Beth both have 400 grams of clay, what is the mass of their clay figures after they shape them?

Back

The mass of their clay figures is still 400 grams each; mass is conserved.

Front

What is the mass of iron if 250 grams of iron and sand are separated and the sand weighs 150 grams?

Back

The mass of the iron is 100 grams.