Name:
Date:
1.
Which equipment will best separate a mixture of iron filings and black pepper?
(1) magnet
(2) filter paper
(3) triple-beam balance
(4) voltmeter
Answer:
1
Scoring Guide:
Rubric:
2.
The diagram below shows an incomplete circuit.
Which item would allow the bulb to light up if it were used to connect point A to point B?
(1) a glass rod
(2) a metal coin
(3) a plastic comb
(4) a paper cup
Answer:
2
Scoring Guide:
Rubric:
3.
The diagram below shows milk being poured into a measuring cup.
Which property of the milk can be directly measured using the cup?
(1) mass
(2) density
(3) solubility
(4) volume
Answer:
4
Scoring Guide:
Rubric:
Base your answers to the following questions on the information below and on your
knowledge of science.
A student adds a mixture of oil, sand, and salt to a beaker of water and stirs. The student
stops stirring and observes that the salt is no longer visible, the oil floats to the top, and the
sand sinks to the bottom of the beaker.
4.
Explain why the oil floats after the stirring stops. [1]
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__________________________________________________________________________
Scoring Guide:
Allow 1 credit for correctly explaining why the oil floats after the stirring stops.
Correct answers include:
??? The oil floats because it less dense than water.
??? The oil floats because its density is less than 1 g/cm3.
??? The oil floats because its density is less than 1.
??? Oil and water have different densities.
??? Oil is less dense than the sand.
Incorrect answers include:
??? The oil weighs less than the water.
??? The oil is lighter than the water.
Answer:
Rubric:
5.
Explain why the salt is no longer visible after the stirring stops. [1]
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__________________________________________________________________________
Scoring Guide:
Allow 1 credit for correctly explaining why the salt is no longer visible after the stirring
stops.
Correct answers include:
??? The salt dissolved in the water.
??? Salt is soluble in water.
??? The water has absorbed the salt molecules.
Incorrect answers include:
??? The salt disintegrated.
Answer:
Rubric:
6.
Identify one way to remove the sand from the mixture in the beaker. [1]
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__________________________________________________________________________
Scoring Guide:
Allow 1 credit for correctly identifying a way to remove the sand from the mixture in
the beaker.
Correct answers include:
??? The sand could be removed from the water by filtering.
??? The sand could be removed using a strainer/sifter.
??? filtering
??? sifting
??? decanting/pouring off the liquid/drain off the liquid
Incorrect answers include:
??? evaporation
??? dig/scoop it out by hand
Answer:
Rubric:
7.
Which instrument could be used to determine the volume of an irregularly shaped solid?
Answer:
4
Scoring Guide:
Rubric:
8.
The illustration below shows an example of energy changing forms.
Which changes in energy form are illustrated in the diagram?
(1) electrical → sound → light and mechanical
(2) sound → mechanical → light and electrical
(3) mechanical → light → sound and electrical
(4) light → electrical → mechanical and sound
Answer:
4
Scoring Guide:
Rubric:
Base your answers to thw following questions on information below and on your knowledge
of science.
Equal-sized pieces of aluminum were placed in test tubes containing equal volumes of acid,
at different temperatures. The temperature of the acid in test tube A is 5??C. The
temperature of the acid in test tube B is 20??C.
9.
What observation would indicate that a chemical reaction is taking place in the test tubes? [1]
__________________________________________________________________________
__________________________________________________________________________
Scoring Guide:
Allow 1 credit for correctly stating an observation that would indicate that a chemical
reaction is taking place in the test tubes.
Correct answers include:
??? formation of bubbles
??? A new substance is being formed.
??? Gas is being formed.
Note: Do not allow credit for ???change in temperature??? or ???heat.???
Answer:
Rubric:
10.
What effect does the temperature of the acid have on the rate at which the reaction
progresses? [1]
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__________________________________________________________________________
Scoring Guide:
Allow 1 credit for correctly stating what effect the temperature of the acid has on the
rate of the reaction.
Correct answers include:
??? As the temperature increases, the reaction rate increases.
??? a direct relationship
??? The reaction occurs more slowly at lower temperatures.
Answer:
Rubric:
11.
Identify two actions the student could take to increase the reaction rate in the test tubes. [2]
(1)
________________________________________________________________________
(2)
________________________________________________________________________
Scoring Guide:
Allow a maximum of 2 credits, 1 for each correct action the student could take to
increase the reaction rate.
Correct answers include:
??? Heat the acid.
??? Heat the aluminum.
??? Use a catalyst.
??? Increase the number of collisions (stir or shake the test tube).
??? Increase the surface area of the aluminum (cut or chop the pieces).
??? change acid
??? Increase the concentration of the acid.
??? Make the acid stronger.
??? Change the metal used in the test tubes.
Incorrect answers include:
??? a smaller piece of aluminum
??? more acid
??? less acid
Answer:
Rubric:
12.
Some common substances and their chemical formulas are listed in the chart below.
??Substance
??Carbonic acid
??Formula
H2CO3
??Oxygen
??Hydrochloric acid
??Carbon dioxide
??Water
??Helium
O2
??HCl
??CO2
??H2O
??HE
Which of these substances are elements?
(1) hydrochloric acid and carbonic acid
(2) carbon dioxide and water
(3) oxygen and helium
(4) water and oxygen
Answer:
3
Scoring Guide:
Rubric:
Base your answers to the following questions on the diagram below and on your knowledge
of science. The diagram shows a phase change represented by letter A.
13.
Explain why the phase change at A is a physical change. [1]
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_________________________________________________________________
Scoring Guide:
[1] Allow 1 credit for an acceptable explanation.
Acceptable responses include, but are not limited to:






New material was not formed.
Composition of materials has not changed.
Although the way the water looks and feels is different, freezing it only changed how the
molecules are set, not its actual atoms and characteristics.
Because although it changes from a liquid to a solid, it???s still water.
It only changed its state and it can be changed back.
The reason is that the water stayed water but changed form.
Note: Do not allow credit for "changing from a liquid to a solid," since this was allowed in
question 64.
Answer:
Rubric:
14.
The four diagrams below model the results of mixing atoms of different substances. Each
atom is represented by a different symbol. Which diagram correctly models a chemical
change?
Answer:
2
Scoring Guide:
Rubric:
15.
Base your answer to the question on the information below and on your knowledge of
science.
A baseball strikes the roof of a car and dents it. The paint on the roof begins
to crack and chip, exposing the metal. The exposed metal on the roof rusts,
eventually causing a small hole in the roof.
Which event is a chemical change?
(1) The baseball strikes the roof.
(2) The roof of the car dents.
(3) The paint cracks and chips.
(4) The exposed metal rusts.
Answer:
4
Scoring Guide:
Rubric: