Transcript Motion and Forces 6 weeks test review

Motion and Forces
6 weeks test review
The amount of water in this graduated cylinder is —
A 50.3 mL
B 54.0 mL
C 67.0 mL
D 53.0 mL
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An equal amount of calcium chloride is added to each of
four beakers of water shown above. After the CaCl2
dissolves, the temperature change in each jar is recorded
in the table.
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A As the amount of water increases, the change in temperature also
increases.
B As the amount of water decreases, the change in temperature increases.
C As the amount of CaCl2 increases, the change in temperature decreases.
D As the amount of CaCl2 decreases, the change in temperature stays the
same.
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H2 + O2 → H2O
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A chemical equation is a symbolic model of what
happens in a chemical reaction. How can the chemical
equation above be improved?
A
B
C
D
Remove the O2 from the left side of the equation.
Switch the H2 to the right side of the equation.
Change the arrow to an equal sign.
Balance the chemical equation.
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In a laboratory, hydrogen gas (H2) is combined with
one-half as much oxygen gas (O2) to produce the
liquid commonly called water (H2O). What evidence
suggests that a chemical reaction has occurred?
A
B
C
D
A change of state took place.
A new substance is formed.
Less matter is present after the substances are joined.
More matter is present after the substances are joined.
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The equation above shows that magnesium (Mg) can react
chemically with oxygen (O) to form a new substance. Which is the
new substance?
A
Mg
B
O
C
MgO
D
Mg(OH) 2
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A chemical equation must be balanced.
What does this show about the reaction
that takes place?
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A The atoms of the reactants are rearranged to form
the products.
B The products contain more atoms than the
reactants.
C There is the same number of products as there are
reactants.
D Not all of the atoms in the products are found in the
reactants.
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Which equation represents a reaction
that has the same amount of mass
before and after the reaction?
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A
FeS + 2HCl  FeCl2 + H2S
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B
C
D
2FeS + 2HCl  2FeCl2 + H2S
2FeS + HCl  2FeCl2 + 2H2S
FeS + HCl  FeCl2 + 2H2S
• 6CO2 + 6H2O + light energy  C6H12O6 + 6O2
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• It is important to write chemical formulas
properly to show what is happening in a
reaction. Which of the following is true of the
equation above?
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A
B
C
D
The 2 in CO2 indicates 2 molecules of CO2.
The 6 before the H2O indicates 6 molecules of H2O.
The 6 in C6H12O6 indicates 6 atoms of hydrogen.
The 2 in O2 indicates 2 molecules of oxygen.
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Analyze and evaluate the data in the table above. When did the
object in motion start to accelerate?
A
Between 10 and 20 seconds
B
Between 20 and 25 seconds
C
Between 25 and 30 seconds
D
Between 30 and 40 seconds
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An unbalanced force acting on an object
causes it to —
A
B
C
D
move at a constant speed
continue moving in a straight line
stand still
change speed or direction
The illustration above shows two groups of children having a
tug of war. The children on the left are exerting a force of 550
Newtons (N) to the left. The children on the right are exerting a
force of 530 Newtons (N) to the right. What is the net force
acting on the rope?
A 20 N to the right
B 20 N to the left
C 1,080 N to the right
D 1,080 N to the left
What causes a basketball to bounce, or
change direction from going down to
going up?
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A The force of the floor on the basketball
B The lines on the basketball
C The weight of the basketball
D The force of the player pushing the basketball
toward the ground
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What two factors must be measured to
determine the speed of a moving object?
A Mass and total distance traveled
B Total distance traveled and direction
C Direction and mass
D Total distance traveled and time elapsed traveling
the distance
This table lists the distance traveled and the time spent traveling that
distance
for four cars. Which car had the highest average speed?
A Car A
B Car B
C Car C
D Car D
What additional information does velocity provide
about the motion of an object that is not
provided by its speed?
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A
The distance traveled
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B
C
D
The direction in which the object is moving
The time elapsed to travel a certain distance
The mass of the moving object
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A car traveling north accelerated from 60 mph to
0 mph in 30 seconds. Acceleration can be defined
as the—
A
change in position over time
B
C
D
change in velocity over time
change in mass over time
time it takes to move from one place to another