If a rock is exposed to extremely high heat, it will ________.
melt
100
All of the following represent physical changes in paper except
a. burning
b. cutting
c. folding
d. crumbling
a. burning
100
What has to occur for cake batter to undergo a chemical change?
It has to be heated.
100
Salt water is a _____________ because salt and water are mixed evenly.
solution
100
If water is heated to a certain temperature it will _________.
boil
200
When water _____________ on cool mornings it is called dew.
condenses
200
What is one way you can tell that a chemical change has taken place?
The object changes color.
200
Adding milk to cereal creates a(n) ________________.
mixture
200
Tearing a piece of paper is an example of a(n) _______________ in the paper.
physical change
300
What happens when matter is heated?
It gains energy.
300
How is a solution formed?
By mixing one or more kinds of matter evenly into another kind of matter
300
Which of the following represents a chemical change of an apple?
a. peeling it
b. cooking it
c. turning brown
d. falling off a tree
c. turning brown
300
When a log burns in your fireplace, a _________________ takes place.
chemical change
300
If a liquid is cooled enough, it will ___________, or change from a liquid to a solid.
freeze
400
A liquid ____________ when it changes into a gas without boiling.
evaporates
400
All of the following are ways mixtures can be separated except
a. by evaporation
b. by its properties
c. by filters
d. by weight
d. by weight
400
How is rust the result of a chemical change?
Iron becomes rust when it is exposed to elements like water and oxygen. The iron then becomes weaker and changes color, becoming rust.
400
All of the following represent types of physical changes except
a. change in color.
b. change in shape.
c. change in state.
d. change in size.
a. change in color.
400
All of the following represent types of chemical changes except
a. change in temperature.
b. change in color.
c. change in shape.
d. the appearance of bubbles.
c. change in shape
500
What is water called in the form of gas?
Water vapor
500
How can magnets be used to separate mixtures?
A magnet will attract any object that is magnetic. Therefore, any objects with magnetic properties can be separated and collected by the magnet.
500
How does your body go through chemical changes?
by breaking down food
500
Describe the similarities and differences between melting and freezing.
Both are physical changes. When a solid gains heat energy, it melts and becomes a liquid. When a liquid loses energy, it freezes and becomes a solid.
500
What is the scientific difference between cutting a tree limb and burning a tree limb?
Cutting a tree limb is a physical change, and burning a tree limb is a chemical change.