Test (7th grade) – Chapters 8 and 9, measurements, unit
conversions, rounding, air pressure, density, weather
DO NOT WRITE
ON THIS TEST
Each question is worth 2 pts. Write your answers clearly on your answer key. Staple
any scratch paper to your answer key. The whole test will be worth 60 points.
For questions #1-3 use the instruments to the right to measure as best as possible
1)
a.
b.
c.
d.
e.
Volume of liquid in graduated cylinder to the right
13.0 ml
13 ml
15.4 ml
13.10 ml
15.50 ml
2)
a.
b.
c.
d.
e.
Measure the pig stick using the metric ruler
2.15 cm
1.1 cm
1.15 cm
2.17 cm
1 3/8 cm
3)
a.
b.
c.
d.
e.
The triple beam balance to the Right
100,704 grams
20
10
70.1006 grams
176 grams
200
174.5 grams
174.50 grams
20
10
cm
1
60
300
70
100
3
2
200
5
4) According to the law of conservation of mass
a. After a chemical reaction the mass of the universe changes.
b. After a chemical reaction the mass of the universe stays the same.
c. After a physical change, such as the melting of an ice cube, the total mass
of the water decreases.
d. After a chemical change, such as the combining of baking soda (sodium
bicarbonate) and vinegar (acetic acid) the total mass of the elements that
make up the reactants decreases.
e. It is mandatory that Jr. High students feel insecure about their hair.
5) A substance can be made of
a. Elements, compounds, or homogeneous mixtures
b. Heterogeneous mixtures
c. Elements and compounds
d. B and C only
e. All of the above
6) Mr. Stevick and Mrs. Quinn are your
science teachers this year.
a. True
b. False
11)
Which of the following ways
would NOT yield a balloon of larger
volume?
a. Placing a partially inflated
balloon in an environment of
lower pressure
b. Forcing more air molecules
into the balloon
c. Placing an inflated balloon
in a cooler environment
d. Placing an inflated balloon
in a warmer environment
e. Causing a chemical reaction
inside of the balloon where a
gas was produced from liquids
or solids.
12)
When a substance is heated,
the molecules will
a. Move faster
b. Move slower
c. Maintain the same level of
kinetic energy
d. Turn into ghosts
e. Start eating Big Tom’s
burgers
13)
Which of the following is a
substance?
a. Colloid
b. Element
c. Mixture
d. Solution
e. Chuck Norris
7) Elements are made of atoms
a. True
b. False
8) When you blow up a balloon, it
seems lighter because it is
displacing air and becoming less
dense (as the mass of the balloon
stays virtually the same but the
volume increases). The inflated
balloon has a buoyant force upwards
equal to the amount of air that the
balloon displaces. This is an
example of
a. Bernoulli’s principle
b. Boyle’s law
c. Thermal expansion
d. Archimedes’ principle
e. Venturi effect
f. Kinetic theory of matter
9) Water vapor condenses onto the
outside of a cold can of soda pop.
The gaseous water molecules are
moving very quickly, and as they
slow down when in contact with the
cooler surface they condense to a
liquid. If there is a very cold
surface then deposition will take
place and solid water, or frost
will form. Which of the following
best describes what is taking
place?
a. Bernoulli’s principle
b. Boyle’s law
c. Thermal expansion
d. Archimedes’ principle
e. Venturi effect
f. Kinetic theory of matter
14)
would
a.
b.
c.
d.
e.
15)
10)
An airplane wing works
because air must move faster over
the curved top of the airplane
wing, making an area of low
pressure, thus allowing air
pressure to push the plane upwards
when a certain speed is reached.
This is an example of
a. Bernoulli’s principle
b. Boyle’s law
c. Thermal expansion
d. Archimedes’ principle
e. Venturi effect
f. Kinetic theory of matter
An example of chemical change
be
Boiling
Evaporating
Melting
Burning
Crumpling
When water starts to boil,
there are small bubbles that form
on the bottom of a beaker. From
what substance are these bubbles
made?
a. Water vapor
b. A mixture of air
c. Oxygen
d. Hydrogen
e. A mixture of hydrogen and
oxygen
16)
Two chemicals with a combined
mass of 25.48 g react in a flask
that has a mass of 142.05 g. A gas
is produced that totally escapes
into a flask that has an empty mass
of 141.65 g. After the reaction,
the first flask and its contents
have a mass of 167.16 g. Calculate
the total mass of the second flask
and gas.
a. 142.02 g
b. 37.01 g
c. 141.65 g
d. 167.53 g
e. A and B
17)
What is the density of a
100.01 ml sphere if it is placed on
an electronic balance and found to
have a mass of 173.456 grams?
a. .576515 g/ml
b. 1.74 g/ml
c. 1.73456 g/ml
d. 4.62 ml/g
e. it is impossible to determine
based on the information given
18)
If you want to determine the
density of an object you would need
to find the following information:
a. The object’s mass and
velocity
b. The object’s distance and
time
c. The object’s volume and
dimensions
d. The object’s mass and volume
e. The object’s favorite TV show
19)
Emily has an irregular-shaped
piece of an unknown metal. She
wants to determine its density, so
she places it on a triple beam
balance and finds that it has a
mass of 46.89 grams. In order to
determine the volume of the object
she places it in water in a
graduated cylinder and then
measures the water level to be 32.4
ml. What is the density of the
metal?
a. 1519 g/ml
b. 7.34 g/ml
c. .691 g/ml
d. 1.45 g/ml
e. it is impossible to determine
based on the information given
20)
The Coco Crispies, a new MLB
franchise, make it to the World
Series and are batting an amazing
.700 until one batter steps to the
plate and smothers a ball, only to
hear the snap, crackle, and pop of
his broken bat as it sails across
the infield. Suspecting foul play
the umpire sticks the pieces of the
bat into a garbage can filled to
the brim with water. When the bat
is fully submerged in the water he
carefully measures that 2.981
liters of water spill out. He dries
the pieces of bat and carefully
places them on a scale to determine
that they have a mass of 2.5 kg.
What is the mass of the bat in
grams?
a. 2500 grams
b. 2.5 grams
c. .0025 grams
d. 5.5 grams
e. It is impossible to determine
based on the information given
21)
What is the density of the
bat in question #20?
a. 1.1 g/ml
b. 1100 g/ml
c. 839.6 g/ml
d. .84 g/ml
e. It is impossible to determine
based on the information given
22)
An object has a mass of 15.07
grams and a volume of 13.5 cm3.
Would it float in water, which has
a density of 1.0 g/ml?
a. No
b. Yes
c. It is impossible to determine
based on the information
given
23)
a.
b.
c.
d.
e.
195 cm = _____________km
.00195 km
.195 km
195000 km
1.95 X 107 km
1.95 X 10-7 km
24) Distances within our solar system are
often measured in Astronomical Units, a
unit based off the distance from the
earth to the sun. This distance is
1,496,000,000 meters. What metric unit
would make the most sense to use when
measuring distances within our solar
system?
a. Meters
b. Gigameters
c. Nanometers
d. Yottameters
e. Hectometers
30) A suction cup works by
a. Using adhesives that chemically
bond to a surface
b. Only allowing air pressure to
push on one side of the device by
expelling air from the other side
c. Sucking
d. Archimedes’ Principle
25) Which of the following elements does
not need to be included in all graphs
that you make for this class?
a. Title
b. Labeled axis with manipulated
variable on the x-axis
c. Units for numbers on both axis
d. Appropriate scale so that as much
of the graph paper is used as is
possible
e. A booger from your nose
26) The first part of a scientific
investigation begins with an
investigative question. After this
question is asked the next step would
be to
a. Collect data
b. Make a graph
c. Write a conclusion
d. Make a list of materials to
answer the question
e. Write a hypothesis
27) A sunbeam is an example of
a. An element
b. A suspension
c. The Tyndall effect
d. A solution
e. A chicken McNugget
28) Rust is formed from oxygen and iron.
How might you keep an iron pipe from
rusting?
a. Dipping it in water and then
setting it out in the air
b. Putting the iron pipe in a
pressure chamber and pumping it
up to 100 lbs/in2 of air.
c. Coating the pipe with another
substance so that the oxygen does
not come in contact with the iron
d. Beating the iron pipe with a
baseball bat
e. Giving the iron pipe to Chuck
Norris
29) When water boils and no energy is
applied to it, as shown in the vacuum
chamber in class, the water
a. Decreases in temperature
b. Increases in temperature
c. Stays the same temperature
d. Undergoes a chemical change
e. Turns into a plasma
Extra Credit questions – Answer these
questions on the back of your answer
sheet with work shown and answers
circled. Each question will be worth a
possible 1 extra credit point.
EC #1 ) Some of the fastest land animals in
the world can run about 61 miles per hour.
In 10.0 seconds how many meters can these
animals travel?
EC #3) The circumference of the earth at
the equator is 24,900 miles. The speed of
sound at standard temperature and pressure
is about 334 m/sec. If you were standing on
the equator and yelled really loud, how
long would it take for you to hear yourself
(assuming that the sound you made travels
all the way around the earth, which is
completely impossible but kind of fun to
think about anyway)?
EC #4) For this problem you will need some
of the information from problem EC #3. How
long would it take for Chuck Norris,
running at his jogging pace of light speed,
to make one trip around the earth at the
equator? The speed of light is 3.0 X 108
m/sec.
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