Physical and Chemical Changes

Which is the property of matter in which a substance can transfer heat or electricity?

• magnetism

• conductivity

• density

• solubility

Tags

NGSS.MS-PS3-3

Serena is mixing a material into a beaker filled with a liquid. She notices that the material seems to disappear into the liquid. What physical property of the material is Serena most likely observing?

• solubility

• conductivity

• magnetism

• density

Eugene describes the physical property of a material as “sweet and floral.” What physical property of the material is Eugene most likely observing?

• boiling point

• shape

• hardness

• odor

What happens when a substance undergoes a physical change?

• Some physical properties change, but the substance keeps its identity.

• No physical properties change, and the substance keeps its identity.

• Some physical properties change, and the substance changes its identity.

• No physical properties change, but the substance changes its identity.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

When liquid gold becomes a solid, its particles get closer together. Which best describes what happened to the gold?

• the conservation of magnetism

• the change in solubility in a physical change

• the change in melting point in a physical change

• the rearrangement of particles in a physical change

Tags

NGSS.MS-PS1-4

What is an example of a physical change?

• having less ash than the paper that was burned to form it

• ice forming and then melting back into water

• rust having a different identity than the iron it forms on

• the irreversible reaction of vinegar and baking soda

Which statement about the physical change of liquid water boiling into steam is true?

• The heat added represents an energy change.

• The action cannot be reversed.

• The steam cannot conserve mass.

• The weight lost represents a mass change.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Water is made of two hydrogen atoms and one oxygen atom bonded together. Julia is describing how water undergoes a physical change when it boils. She says that the particles shift to be farther apart and that the oxygen and hydrogen separate. She also says that the total mass of the steam is the same as the initial water, and that heat energy was required to cause the change. She finishes her description by saying that the steam can be turned back into water if it is cooled.

Which is the mistake in her description?

• The total mass remains the same in physical changes.

• The arrangement of particles may change in physical changes.

• Atoms remain bonded to each other in physical changes.

• Energy changes may occur in physical changes.

Tags

NGSS.MS-PS1-4

Which scenario is an example of a physical change?

• Wood is burned in a campfire and is turned into ash and smoke.

• Yeast turns sugar into energy, water, and carbon dioxide gas.

• Lead is melted into a liquid to form pellets.

• A piece of metal is left in the rain and forms rust.

When water (H₂O) freezes into ice, some of the properties have changed. What stays the same?

• property of the H₂O

• arrangement of the H₂O

• energy of the H₂O

• identity of the H₂O

Tags

NGSS.MS-PS1-4