Question

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

magnetism
conductivity
density
solubility


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



Which scenario is an example of a physical change?

Wood is burned in a campfire and is turned into ash and smoke.
A piece of metal is left in the rain and forms rust.
Lead is melted into a liquid to form pellets.
Yeast turns sugar into energy, water, and carbon dioxide gas.



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.

Answer 1

1) conductivity — it’s the ability to transfer heat or electricity.

2) odor — “sweet and floral” describes a smell.

3) Lead is melted into a liquid to form pellets — melting is a physical change (change of state).

4) Atoms remain bonded to each other in physical changes — boiling does not break H–O bonds; water molecules stay intact as they become steam.