North Carolina Science Grade 8

Chapter 15: Chemistry and Technology

Standardized Test Practice

1.
Which of the following best describes a material that is malleable?
A)can be hammered or rolled into sheets
B)attracted and repelled by magnets
C)easily penetrated by electrons
D)reacts easily with other compounds
2.
Which of these is a good property for a material that needs to be easily dissolved in hot water?
A)high density
B)low density
C)low solubility
D)high solubility
3.
What is the name of the polymer shown in the illustration? [insert art 682_STP_Questions_ta01 illustration of polyvinyl chloride, p. 443]
A)high-density polyethylene
B)low-density polyethylene
C)polyvinyl chloride
D)polyvinyl hydride
4.
Which term is used for a mixture of a metal and one or more other elements?
A)ceramic
B)alloy
C)composite
D)polymer
5.
The graph above shows the melting points and boiling points of different compounds. Which pair of compounds could be used for a new product that must be a gas at 300ºC? [insert art 682_STP_Questions_ta02 graph of melting/boiling points, p. 462]
A)compounds 2 and 6
B)compounds 1 and 4
C)compounds 4 and 5
D)compounds 2 and 5
6.
Which compound has the smallest temperature range at which it is a liquid? [insert art 682_STP_Questions_ta02 graph of melting/boiling points, p. 462]
A)compound 1
B)compound 5
C)compound 6
D)compound 4
7.
A certain type of stainless steel is 73.0% iron. What is the mass composition of iron in a 625-g sample of the material?
A)147 g
B)169 g
C)456 g
D)476 g
8.
Which of the following is a chemical property?
A)density
B)melting point
C)solubility
D)flammability
9.
Which of the following terms refers to the amount of mass in a certain volume?
A)density
B)conductivity
C)reactivity
D)solubility
10.
During which development stage is a full-scale model of a product made?
A)computer simulation
B)pilot plant
C)prototype
D)quality control
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