Download PSR 181-186 asnwers

Physical Science Review
Pages 181-186
NAME ____________________
1. An expression that uses symbols and formulas to summarize a chemical reaction is
called a chemical ____equation________.
2. The chemicals that are used (what you start with) in a chemical reaction are called
the __reactants____. They are on the ___left________ side of the arrow.
3. The chemicals that are produced (what you end with) in a chemical reaction are
called the __products_____. They are on the ___right_______ side of the arrow.
4. In a chemical reaction, the mass of the ___reactants____ must equal the mass of
the __products_____. This is the Law of Conservation of _Mass_____.
5. Atoms are neutral because they have the same number of ___protons_____ and
___electrons___.
6. Electrons have a ___negative____ charge and they are found _around the nucleus_.
7. Protons have a __positive_____ charge and they are found in the __nucleus___.
8. Neutrons have a ___neutral______ charge and they are found in the _nucleus__.
9. In order to react, molecules must __collide______ with sufficient force.
10. When the temperature goes up, molecules move ___faster______. This makes a
chemical reaction happen ___faster______.
11. Complete the chart below regarding the three main states/phases of matter.
Phase
Shape
Definite or Not?
Volume
Definite or Not?
Speed of
Particles
SOLID
Definite
Definite
Slow
LIQUID
Not
Definite
Medium
GAS
Not
Not
Fast
Position of
Molecules
12. Tell the names of these phase changes:
a. Solid to liquid:
___melting_______
b. Liquid to solid:
___freezing______
c. Liquid to gas:
___evaporation___
d. Gas to liquid:
___condensation__
e. Solid to gas:
___sublimation___