Density, Chemical and Physical Changes TEST
Total Points: _______/ 100
1. When a new substance is formed with different properties than the original
substance it is called a
a. Chemical Change
b. Physical Change
c. Freezing
d. Boiling
2. Which is an example of a chemical change?
a. Water freezes
b. Wood is cut
c. Bread is baked
d. Wire is bent
3. Metal oxidizing (tarnishing, rusting) is an example of a:
a. Chemical property
b. Physical property
c. Chemical change
d. Physical change
4. Which of the following is not a chemical property of matter?
a. Flammability
b. Corrosive
c. Melting point
d. Acid/base reactivity
5. When a substance changes appearance, but not into something different.
a. Chemical Change
b. Physical Change
c. Color Change
d. Precipitate formation
6. Which of the following is true of chemical properties?
a. They describe the phase the substance is in.
b. They describe characteristics of a substance such as size, color, and shape.
c. They explain how the substance reacts with other substances
d. They describe what chemical changes the substance is currently going
through.
Directions: For questions 7-11, mark each property as chemical (C) or physical (P)
A cube of sugar has the following properties:
7. Mass = 2grams
8. Density = 8g/cm3
9. Burns when heated
10. Composed of small, white crystals
11. Bubbles and fizzes when heated
Terry and Jean experimented with several items to see what would happen under different
conditions. Below is the table they wrote at the conclusion of the experiment.
Questions 12-14
Steel Wool
Paper
Copper Wire
Wood splinter
Put in water over night
Held in candle flame for
30 seconds
Rusted
Got soppy
Got wet
Swelled up with water
Burned
Burned
Got hot, bent in middle
Burned
Connected to the
terminals of a 12 volt
battery
Burned
No change
Got hot, melted in half
No change
12.
Which
substance
changed
chemically
under
allthree
threeconditions?
conditions?
a.
steel
wool
b.
paper
c.
wire
d.
wood
13.
substance
changed
physically
all
a.
steel
wool
b.
paper
c. copper
copper
d.
wood splinter
splinter
14. Which
What
would
aisgood
conclusion
forunder
thiswire
experiment?
a.
steel
wool
the
most
reactive
b. copper
paper
isbe
the
most
reactive
c.
wire
is
the
most
reactive
d.
wood
splinter
is
the
most
reactive
15. What are the four clues to a chemical change?
16. Two clear liquids were mixed together. Which of the observations listed below most likely
indicates that a chemical reaction occurred?
a. After mixing, the resulting solutions was clear.
b. Bubbles formed in the resulting solution.
c. Two liquids mixed rapidly
d. The temperature of the solution remained constant.
Use the Density table below to answer Question #17
You will also need this table for the Case Study in Question
17. A wooden speed boat flipped over and its gasoline leaked into a lake.
On your answer sheet in the spaces provided, label how you would expect all of the layers to look.
The layers should include: fresh water, sand, the boat, gasoline.
Density of Common Substances
Material
Density
(g/cm3)
Air
0.0013
Wood
0.61
Gasoline
0.7
Water (ice)
0.9
Water (liquid)
1.0
Aluminum
2.7
Steel
7.8
Silver
10.5
Gold
19.3
A student designed an experiment to test the chemical and physical properties of four
known, solid substances (A, B, C, and D) and one unknown solid substance. She suspected
the unknown substance was one of the four known substances. The properties she
tested are listed in the table.
boiling point melting point
freezing point
mass
volume
shape
reaction to
reaction to
reaction to water
acid
heat
color
odor
density
18. The student discovered that the unknown was identical to substance “C” in every
property except mass and volume. Could the unknown possibly be identified as “C”?
A. yes, if any of properties are the same, then the substances are the same
B. yes, mass and volume can vary even in the same substance
C. no, mass and volume are important measurements
D. no, all properties must match
To receive full credit you must show the formula and your work.
19. What is the density of a rock that has a mass of 14g and a volume of 15mL?
20. What is the volume of a tank that can hold 18,754Kg of methanol whose density is
.788g/cm3
21. How many Kg of mercury would fill a 5L container if the density of mercury is
13.6g/cm3
22. What is the density of a board whose dimensions are 5.54cm x10.6cm x 199cm and
whose mass is 28.6Kg?
23. A sample of lead is found to have a mass of 32.6g. A graduated cylinder contains
2.8mL of water. After the lead sample is added to the cylinder the water level reads
5.7mL. Calculate the density of the lead sample.
C
Case Study
24.
Use the information in the data table to answer the following questions
• BE SURE TO ANSWER AND LABEL ALL PARTS OF THIS QUESTION.
• Show all your work (diagrams, tables, or computations) on your Answer Sheet.
• Explain in writing how you did the work in order to receive full credit.
Metal A
Metal B
Metal C
Properties
Silvery white, nonmagnetic,
ductile, malleable
Mass
500 g
Shiny yellow, soft,
nonmagnetic, metallic,
malleable
137 g
Soft, white, lustrous, most
ductile and malleable, good
conductor of heat
75 g
Volume
185 ml
7.1 cm3
7.1 ml
Melting point
660.37 °C
1064.43 °C
962 ºC
Someone in the lab did not put the metals back properly! The scientist now has three
unlabeled samples of pure metals and he needs to determine the identity of each metal.
Using your knowledge of physical and chemical properties, help the scientist identify these
3 metals.
A. Identify which ONE of the following properties is the best option to help the
scientist determine the identity of the pure metal in each sample: color, melting
point, mass, or volume.
B. Explain why/how the property you identified in part (A) can be used to determine
the identity of the pure metal in each sample.
The scientist cuts each of the metal samples into two smaller pieces.
C. Is the property that was used in part A to determine the identity of the metal
affected when each sample is cut into two pieces? Explain your answer.
D. Name 2 other tests the scientist might use to clearly determine the identity of the
3 samples.
The scientist can also use density to determine the identity of the pure metal in each sample.
E. How can the scientist determine the density of the pure metal in each sample?
F. Calculate the density of the 3 samples using the information given in the data table.
G. Identify the 3 samples by comparing your answers in (F) to the information in the
Density Data Table from Question 19.
The scientist then adds one of the small pieces of metal A to a clear solution. It starts to
fizz, a white solid appears and an odor is produced.
H. Was this a physical or chemical change? Explain your answer.