Chemistry Reference
In-Depth Information
3. [chemical]—To know if something is flammable, we must try to burn it.
4. [intensive]—Think of these properties as being “in” the substance (intensive),
such as color and density. They don't change due to the size of the sample.
5. [physical]—You can see that a metal is shiny without trying to carry out a
chemical reaction on it.
6. [A. density]—The density of a material can be used to identify it. It won't
change due to the size of the sample.
7. [B. flammability]—We only observe the flammability of a substance when
we are carrying out a chemical change (combustion) on it.
8. [A. length]—The length of an object will certainly depend on the size of the
sample.
9. [A. length]—See answer 8.
10. [Intensive properties don't depend on the amount of the substance (sample
size) present, whereas extensive properties do.]—The extensive properties
of a substance will change with the size of the sample. For example, the
color (intensive property) of table salt is the same, regardless of how much
of it you have. The weight (extensive property) of your salt sample will
certainly depend upon the size of your sample. (The wording of your answer
may vary from mine.)
Lesson 1- 4 Review
1.
[chemical]—Chemical changes, which are also called chemical reactions,
result in the production of new substances, with their own properties.
2.
[conservation]—The Law of Conservation of Mass is very important to the
study of chemistry.
3.
[sublimation]—Dry ice is called “dry” because it never melts into the liquid
phase.
4.
[physical]—If I cut a wooden board in two pieces, both pieces are still made
of wood.
5.
[state or phase]
6.
[D. burning wood]—If we completely burn a piece of wood in a fire, we
won't have wood anymore.
7.
[B. H
2
O
(s)
]
8.
[B. CO
2(s)
CO
2(g)
]
9.
[Physical changes don't result in the production of a new substance;
chemical changes do.]
