What is the main question addressed by the law of conservation of mass?

• How does the volume of a substance change during a reaction?

• What are the different states of matter?

• How is the mass of a substance affected when it undergoes a change?

• How does temperature affect chemical reactions?

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is an example of a physical change?

• Baking a cake

• Burning wood

• Rusting iron

• Freezing water

Tags

NGSS.MS-PS1-4

Which of these is NOT a sign of a chemical change?

• Formation of a solid

• Heat production

• Change in shape

• Color change

Tags

NGSS.MS-PS1-2

What does the law of conservation of mass state?

• Mass can be created or destroyed in a chemical change.

• Mass remains constant before and after a change.

• Mass increases during a physical change.

• Mass decreases during a chemical change.

Tags

NGSS.MS-PS1-5

In the example of boiling water, what happens to the mass of the water and steam?

• It decreases.

• It increases.

• It fluctuates.

• It remains the same.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-5

What was observed in the steel wool experiment?

• The steel wool changed color.

• The mass of the steel wool increased.

• The mass of the steel wool decreased.

• The mass of the steel wool remained the same.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How is steel wool represented in the particle diagram?

• As a blue circle

• As a green triangle

• As a red square

• As a black circle

What change occurs when ice melts?

• It changes from a liquid to a solid.

• It changes from a gas to a solid.

• It changes from a solid to a liquid.

• It changes from a liquid to a gas.

Tags

NGSS.MS-PS1-4

What indicates a chemical change in the glow stick experiment?

• Change in shape

• Change in temperature

• Change in volume

• Production of light

Tags

NGSS.MS-PS1-2

What happens to the particles in the glow stick when it is cracked?

• They remain unchanged.

• They disappear.

• They combine to form a new substance.

• They separate into different substances.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5