Ice Cream in a Bag – Posttest
Circle the correct answer:
1. Which of the following physical states has particles that move very fast and travel as far apart as they can?
solid
molecule
liquid
gas
2. What happens to particles of liquid water when the water is heated?
They slow down and the space between them decreases
They slow down and the space between them increases
They speed up and the space between them decreases
They speed up and the space between them increases
No change takes place
3. Which of the following ways are solids and gases alike?
Both have particles that are very close together
Both are made of particles
Both have particles that move very slow
Both have particles that move very fast
4. Which is too small to view with a microscope?
a cell
an atom
one bacteria
a single virus
5. The particles that are bound together the tightest are found in a
mixture
solid
liquid
gas
6. Which of the following physical states has particles that vibrate in place and do not move past their neighbors?
solid
molecule
liquid
gas
7. Models are used to represent atoms. The model used today is not the same as the model used 200 years ago. What is a possible explanation for the change in the atomic model?
Scientists in the past could not see atoms, but now that scientists have seen the atom, they have been able to develop the correct, final model.
Scientists conducted further experiments and were then able to make the modern, completely correct model.
Scientists in the past did not have the modern equipment used to see atoms and science conclusions may change as new equipment is invented.
Scientists conducted further experiments on atoms and science conclusions may change as new evidence is found.
8. Which is the smallest particle?
molecule
atom
compound
solid
9. Which of the following physical states has particles that move to take the shape of whatever container they are in?
molecule
liquid
gas
solid
Answer Key
Ice Cream in a Bag – PostTest
1. gas
2. They speed up and the space between them increases
3. Both are made of particles
4. atom
5. solid
6. solid
7. Scientists conducted further experiments on atoms and science conclusions may change as new evidence is found.
8. atom
9. liquid