Unit 5 Exam
EXAM
Name
Date
Class
Part I: Multiple Choice
There is only one correct answer for each multiple-choice question.
(Questions 1–2) The next two questions refer to the situation below.
Joshua did an experiment in his class. He poured a small amount of powdered copper into a
container and measured the mass to be 203 g. Then he gently heated the container, stirring
occasionally. After several minutes, the contents of the container turned into a black, flakey solid.
After the container cooled, the mass of the container with the black stuff was 209 g.
1. The evidence from this experiment suggests that
a) both a chemical and a physical interaction occurred.
b) a physical interaction occurred.
c) a chemical interaction occurred.
d) there was no interaction.
2. The increase in mass of the container indicates that
a) mass is not conserved in this interaction.
b) the density of the copper increased.
c) the copper melted and then solidified.
d) a gas in the air reacted with the copper.
e) None of the above.
3. Which of the following is a property of zinc metal.
a) It can be hammered into different shapes.
b) It is a poor conductor of electric current.
c) It has a dull surface.
d) It has a very low density.
e) It has a low melting temperature.
© It’s About Time
4. Grinding copper into a powder is
a) both a chemical and a physical interaction.
b) a physical interaction.
c) a chemical interaction.
d) neither a chemical nor a physical interaction.
InterActions in Physical Science
1
UNIT 5 MATERIALS AND THEIR INTERACTIONS
5.
Which is NOT a physical interaction?
a) shredding
b) burning
c) condensing
d) sawing
6.
A reversible interaction is:
a) Any interaction where the original substance can be recovered through a chemical
interaction.
b) Any interaction where the original substance can be recovered through a chemical or a
physical interaction.
c) Any interaction where the original substance can be recovered through a physical
interaction.
d) None of the above.
7.
Which of the following interactions is reversible?
a) Dissolving an effervescent antacid tablet in water.
b) Dissolving salt in water
c) Both A and B
d) None of the above
8.
Which statement is FALSE?
a) A solution is a mixture where one substance is dissolved into another.
b) A solution can be separated during a phase change.
c) A single substance can be separated by physical or chemical interactions.
d) A single substance can be separated by chemical interactions.
9. Bronze is an alloy (mixture) of the elements copper and tin. What would be the best
procedure to separate these two elements?
a) Break the bronze into very small pieces and run them through a strainer.
b) Use a magnet to pull out the copper from the tin.
c) Heat the bronze until one of the elements melts out.
d) Pick out the tin or copper with tweezers.
a) Water is not a mixture because it cannot be separated into different substances during
a physical interaction such as boiling.
b) Water is a mixture because it can be separated into different substances during a
chemical interaction such as the electrolysis of water.
c) Water is a mixture because it can be separated into different substances during a
physical interaction such as boiling.
d) Water is not a mixture because it cannot be separated into different substances during
a chemical interaction such as the electrolysis of water.
2
UNIT 5: MATERIALS AND THEIR INTERACTIONS
© It’s About Time
10. Which is the best explanation for whether pure water, which is made up of oxygen and
hydrogen, is or is not a mixture?
Unit 5 Exam
11. Which statement about metal properties is FALSE?
a) Metals shine brightly when polished.
b) Metals tend to be solids at room temperatures.
c) Metals are poor conductors of electric current and heat energy.
d) Metals tend to have high melting temperatures and densities.
12. Which statement is TRUE?
a) A single substance is a compound.
b) An element can be a compound.
c) A compound is a single substance that can be broken down into simpler substances
during a chemical reaction.
d) None of the above.
13. Which statement is FALSE?
a) Most elements combine with other elements to form compounds.
b) Few elements are found in nature by themselves (not in a compound).
c) Over 100 elements have been identified.
d) Elements are made up of one or more type of atom.
14. Which of the following statements about the noble gases is FALSE?
a) They are colorless and transparent.
b) They are chemically reactive and unstable.
c) They have very low melting temperatures.
d) They have low densities.
15. Which type of element is used in making semiconductors for electronic devices such as
computers and video games?
a) noble gases
b) metals
c) non-metals
© It’s About Time
d) metalloids
InterActions in Physical Science
3
UNIT 5 MATERIALS AND THEIR INTERACTIONS
(Questions 16–17) Refer to the four diagrams of the Periodic Table of the Elements below.
A.
B.
C.
D.
16. Which periodic table above (A, B, C or D) has the shaded area where you find all of the
non-metal elements?
a) A
b) B
c) C
d) D
17. You want to find a certain transparent, gaseous element on the periodic table that is
chemically stable. Which periodic table above (A, B, C or D) has the shaded area showing
where you should look?
a) A
b) B
c) C
18. The transition metals are much less reactive than the alkali and alkaline earth metals. More
can be found in their native (elemental form). Which group(s) of elements on the periodic
table are the transition metals?
a) 15
b) 1
c) 3-12
d) 18
4
UNIT 5: MATERIALS AND THEIR INTERACTIONS
© It’s About Time
d) D
Unit 5 Exam
19. Which of the following is a physical property of a substance?
a) It interacts with BTB (color change from blue to yellow).
b) It is not flammable (does not burn).
c) It interacts with baking soda to produce bubbles of a gas.
d) Its melting temperature is –70 ºC.
20. Air separates into different gases (mostly nitrogen and oxygen) when it is cooled and liquifies.
Air is
a) a suspension.
b) a solution.
c) a compound.
d) an element.
End of Part 1. Refer to your answer sheet for Part II of this exam.
Part II. This part includes classification and explanations problems. Use How To Write an
Analysis and Explanation to help you answer the explanation problems. Check that your
analysis and explanation are good using the criteria in How To Evaluate an Analysis and
Explanation. You will also need the Table of Densities, the Table of Melting and Boiling Points,
and the Periodic Table of the Elements.
21. A high school chemistry student tested an unknown clear liquid.
No pieces with different properties were seen in the clear liquid
under a powerful microscope. When the liquid was heated in a
test tube, a white solid was left after the liquid boiled away.
Is the unknown liquid a suspension, solution, compound,
or element? Justify your answer.
I think the unknown liquid is a
boiling
chips
because
© It’s About Time
butane burner
InterActions in Physical Science
5
UNIT 5 MATERIALS AND THEIR INTERACTIONS
© It’s About Time
22. Rubidium (Rb) is a metal element used in solar cells, batteries, and television picture tubes
because of its particular properties. Use your Periodic Table of the Elements to identify two
elements that would likely have similar properties as rubidium. Explain your answer.
6
UNIT 5: MATERIALS AND THEIR INTERACTIONS