Unit 1 & 2 Test Review

Unit 1 & 2 Test Review
Rules of the game:
Students will divide up into 4 groups.
Each group will have one dry-erase board to record their answers.
After the question slide is shown, the group will discuss the answer and one person will write on
the dry-erase board.
The first group to hold up the correct answer wins points for that question.
Question 1 (10 points)
True or False
pH is considered to be a physical property of matter
Answer: False; it is a chemical property because it is
dependent upon the composition of the material
Question 2 (15 points)
A classroom lab experiment involved combining 2 different
unknown substances. After combining, the students
noticed that solid, white crystals formed in the bottom of
the flask. What kind of change did the substances undergo?
Answer: Chemical change; the white crystals were the
result of the two substances chemically reacting
Question 3 (20 points)
Water was poured from a 500 mL beaker into
three separate, smaller beakers. The first
beaker had 20 mL, the second had 100 mL, and
the third had 200 mL. Which beaker’s water
had the highest density?
Answer: the density is the same in all; density is
an intensive property
Question 4 (10 points)
This safety symbol means what?
Answer: biohazard
Question 5 (15 points)
Which state of matter is the most easily compressed?
Answer: gas; its molecules are much further apart
due to the high energy levels
Question 6 (20 points)
Definite shape and definite volume describe which
state of matter?
Answer: solid
Question 7 (10 points)
When ice melts, the density will decrease. Why?
Answer: as the ice melts into water, the volume
increases, but the mass stays the same
Question 8 (15 points)
What piece of lab equipment is best for measuring
Answer: balance
Question 9 (10 points)
What is the biggest difference between a mixture and
a pure substance?
Answer: a mixture can be broken down (separated)
into its components; a substance cannot
Question 10 (20 points)
Is an element considered to be a mixture or a
pure substance?
Answer: pure substance
Question 11 (20 points)
Is a compound considered to be a mixture or a pure
Answer: mixture
Example: NaCl is sodium chloride; it can be separated
chemically into Na (sodium) and Cl (chlorine)
Question 12 (10 points)
A change in state of matter (example: ice melting) is
what type of change?
Answer: physical
Question 13 (20 points)
A mixture that is uniform throughout with the same
composition is called what?
Answer: homogeneous
Question 14 (20 points)
Is water an element, mixture, or compound?
Answer: compound
Let’s look at water (H20)
substances that cannot be “broken down” any
because it consists of water molecules and
salt molecules.
Question 15 (15 points)
True or False
Chocolate milk is an example of a heterogeneous
Answer: false; it is homogeneous
Question 16 (20 points)
What is the density of an object with a mass of 5.09 g
and a volume of 15 mL?
Answer: mass/volume = 0.34 g/mL
Question 17 (10 points)
How do you dispose of chemical waste in the
A. pour it down the sink
B. pour it back in the original container
C. put it in a biohazard bag
D. Follow the instructions given on the chemical’s MSDS
Question 18 (15 points)
Jim was working alone in the laboratory and dropped
a beaker containing acid on the benchtop and it
broke. What did Jim do incorrectly and what should
he do now?
The acid spill should be handled according to the MSDS (usually needs to be
neutralized by a base). The glass should be carefully picked up and placed in a
container set up specifically for broken glass; it should not be placed in the trash
Question 19 (10 points)
Bleaching hair would be what type of change?
Answer: chemical