Digesting food is an example of what kind of change?
Chemical change.
100
How does heating and cooling cause change in matter?
It can change matter from a liquid to a solid and vice versa.
100
What is a gram?
The basic unit for measuring mass.
200
What is mass?
The mount of material that an object has in it.
200
How many meters are in a kilometer?
1,000 m
200
When liquid is cooled to its freezing point, the tiny particles of matter that make up liquid move father apart or closer together?
Closer together.
200
What is the boiling point of a material?
The temperature at which a material changes from a liquid to a gas.
200
What is density?
How much mass is in a certain volume of matter.
300
Which has a greater mass: a notebook or a textbook?
A textbook.
300
True or false: A centimeter is 1/1,000 of a kilometer.
False, it is 1/100 of a kilometer.
300
A chemical change always results in...
a different kind of matter.
300
What is the boiling point of water?
100 degrees celsius
300
Why do they use the metric system of measurement for most parts of the world?
It helps make the measurements more accurate.
400
When you mix salt with water what is it called?
A solution.
400
What are two units used for measuring volume?
Cubic meters and liters.
400
Suppose you pour 200 mL of both milk and water into the same graduated cylinder. You look at the graduated cylinder and see that the milk went under the water. Why is this so?
The milk has a greater density than the water.
400
What is the difference between a physical and chemical change?
A physical change does not change matter into a different kind of matter. A chemical change produces a completely different kind of matter.
400
Name a chemical change and name one physical change.