Overview of Chapter 2 of "Physical Science: Concepts in Action" textbook.

1. Chapter 2.1 & 2.2
Claire W.
8-4

2. Why does every sample of a given
substance have the same
properties?
a substance has a fixed, uniform composition

3. Why does an element
have a fixed composition?
an element
contains only one
type of atom

4. What does a compound
always contain?
two or more
elements joined
in a fixed proportion

5. Why can the properties
of a mixture vary?
the composition of a mixture is not fixed

6. Based on the size of its largest
particles, how can a mixture be
classified?
suspension
colloid
solution

7. What are some examples
of physical properties?
malleability melting point viscosity
conductivity
hardness
density
boiling point

8. What are physical
properties used for?
to separate the substances in a mixture
to identify a material
to choose a material for a specific purpose

9. What are two common
separation methods?
filtration
distillation

10. Filtration
• a process that separates
materials based on the
size of their particles

11. Distillation
• a process that separates the
substances in a solution based on
their boiling points

12. Evaporation
• a process
that turns
liquid into
vapor

13. Under what conditions can
chemical properties be observed?
• only when
the
substances
in a sample
of matter
are
changing
into
different
substances

14. What are three common types of
evidence for a chemical change?
• change in color
• the production of gas
• the formation of a precipitate

15. How do chemical changes differ
from physical changes?
• in a
chemical
change, the
composition
of the
matter
changes • in a physical change,
the composition of
the matter stays the
same

16. Test Question #1
What is a
suspension?

17. Test Question #2
What are two
differences between a
homogeneous and a
heterogeneous
mixture?

18. Test Question #3
What are three
common
separation
methods?

19. Test Question #4
What is a
suspension?

20. Test Question #5
Name four
examples of
physical
properties.

21. Test Question #6
What are three
common types of
evidence for a
chemical change?