The mole fraction of He in a gaseous solution prepared from 4.0 g of He, 6.5 g of Ar, and 10.0 g of Ne is __________.
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Which of these describes what happens when water freezes?
A. a phase change occurs from a liquid phase to a solid phase
B. an exothermic process occurs where energy is lost from ice to the surroundings
C. the liquid water changes from a random structure to a crystalline solid
D. all of the above
Answer: D
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In filtration, the term "filtrate" refers to
A. the solid that remains on the filter paper
B. the liquid that drains through the filter paper
C. the type of filter paper used
D. the mixture before separation
Answer: B
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A gas occupies a volume of 2.4 L at 14.1 kPa. What volume will the gas occupy at 84.6 kPa?
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The gaseous mixture is a ___________ phase system.
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Standard temperature and pressure (STP) refers to which conditions?
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Fractional distillation cannot be used to
A. separate the components of liquid air
B. refine crude oil
C. test the purity of a substance
D. separate methanol and water
Answer: C
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The density of a crystal depends on all the following except
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Which of these assumes the shape of its container?
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One of the followings is not true of liquids
A. The inability of a liquid to flow enables it to assume the shape of the container
B. A liquid never expands to fill the container
C. The characteristics of a liquid lie between those of a solid and a gas
D. Particles of liquid are free to move from one point to another
Answer: A
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