Chemistry in the Community
Term Review
Name:
1. Name 3 physical properties of a substance:
a.
b.
c.
2. Name 3 chemical properties of a substance:
a.
b.
c.
3. The number of protons = the number of _______________________ in an ATOM
4. An example of a compound is _______________________ (i.e. Ni or CaO)
5. Find the density of a rock weighing 100g with a volume of 555 cm^3.
6. What does it mean when the result of an ion test is negative (no color or
precipitate)?
7. A physical property of a substance can be determined WITH or WITHOUT
changing the substance?
8. Atoms of the same element have the same ______________________.
9. List element names and the number of atoms of each element in the given
compound:
a. HeNO2
b. Fe3Mg
c. C2OH
10. A 4.00-cm^3 sample of lead has a mass of 42.0 grams. What is the density of
the lead?
11. What are the steps of the scientific method?
12. If an oil sample floats on water, the density of the oil is less than water.
True/False
13. Negatively charged fundamental particles of an atom are known as
____________.
a. Alpha particles
b. Electrons
c. Protons
d. Neutrons
14. Match the following terms and processes of nature’s water purification
system:
I. Filtration
A. followed by condensation removes nearly all
dissolved substances
II. Bacterial Action B. converts dissolved organic contaminants to a
few simple action compounds
III. Evaporation
C. sand and gravel remove nearly all suspended
matter.
a. I=A, II=B, III= C
b. I=C, II=B, III=A
c. I=B, II=A, III=C
15. Gold is a heavy metal. It has a gas density of 19.3 g/ml. What is the mass of
70.0 ml of gold?
a. .276g
b. 3.63 g
c. 560 g
d. 1350 g
16. If a neutral atom loses an electron, it becomes a
a. Positive ion
b. Negative ion
c. Neutral ion
d. A neutron
17. Atoms, which has become ions, have lost or gained
a. Electrons
b. Protons
c. Neutrons
d. Electrons and protons
18. How many milligrams are there in 1000 grams?
19. Most of Earth’s supply of water is found in
a. Rivers
b. Oceans
c. Glaciers
d. Water vapor
20. How many meters equal 92.5 centimeters?
21. Which one of the following is a way to remove dissolved salt from water?
a. Filter the salt solution through sand
b. Filter the salt solution through charcoal
c. Distill the salt solution
d. Physically separate the salt solution from the denser pure water.
22. Krusty Krabs Breath Mints Mr. Krabs created a secret ingredient for a breath
mint that he thinks will “cure” the bad breath people get from eating crabby
patties at the Krusty Krab. He asked 100 customers with a history of bad
breath to try his new breath mint. He had fifty customers (Group A) eat a
breath mint after they finished eating a crabby patty. The other fifty (Group
B) also received a breath mint after they finished the sandwich, however, it
was just a regular breath mint and did not have the secret ingredient. Both
groups were told that they were getting the breath mint that would cure
their bad breath. Two hours after eating the crabby patties, thirty customers
in Group A and ten customers in Group B reported having better breath than
they normally had after eating crabby patties.
a. 1. Which people are in the control group?
b. 2. What is the independent variable?
c.
3. What is the dependent variable?
d. 4. What should Mr. Krabs’ conclusion be?
e. 5. Why do you think 10 people in group B reported fresher breath?
23. Compare and contrast direct and indirect water use.
24. Significant figures: Explain the rules regarding zeroes. When do they count?
When are they never counted?
25. How many sig figs?
a. _______ .0075
b. _______ 1.0084
c. _______ 1,009,342
d. _______ 54000