What is a physical change? (1 point)
Responses
a change that does change the chemical identity of a substance
a change that does change the chemical identity of a substance
a change that does not change the chemical identity of a substance
a change that does not change the chemical identity of a substance
a change that is visible
a change that is visible
a change that is not visible
a change that is not visible
A piece of paper is torn into pieces.
Why is this an example of a physical change?
(1 point)
Responses
the paper molecules break up
the paper molecules break up
the paper molecules remain paper molecules
the paper molecules remain paper molecules
the paper molecules become smaller
the paper molecules become smaller
the paper molecules change their state of matter
the paper molecules remain paper molecules
Which statement best describes the molecules of a solute that has fully dissolved into a solvent? (1 point)
Responses
They are all settled at the bottom of the solution.
They are all settled at the bottom of the solution.
They are evenly spread out throughout the solution.
They are evenly spread out throughout the solution.
They have gotten hotter, causing the solution to evaporate.
They have gotten hotter, causing the solution to evaporate.
They have changed color, causing the solution to change color.
They are evenly spread out throughout the solution.
Maria is bored over the weekend and decides to mix salt and sugar together. Is she causing a physical or chemical change? (1 point)
Responses
This is a physical change because the salt and sugar dissolve in water.
This is a physical change because the salt and sugar dissolve in water.
This is a chemical change because the salt and sugar grains change state.
This is a chemical change because the salt and sugar grains change state.
This is a chemical change because the salt and sugar molecules change.
This is a chemical change because the salt and sugar molecules change.
This is a physical change because the salt and sugar grains do not change.