Air is a mixture of gases.

True

False

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Question 2 0.2 pts

The percentage of oxygen in air is ___%.

0.9

78

0.1

21

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Question 3 0.2 pts

Different gases behave similarly in many cases because they havethe same ___ properties.

extensive

chemical

physical

intensive

nuclear

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Question 4 0.2 pts

All of the following are diatomic gases at room temperatureexcept ___.

nitrogen

hydrogen

oxygen

helium

chlorine

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Question 5 0.2 pts

Substances that are gases at room temperature are composed of___.

metals only

nonmetals only

metals and nonmetals

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Question 6 0.2 pts

Gases tend to have ___ molecular formulas and ___ molecularmasses.

complex, high

complex, low

simple, low

simple, high

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Question 7 0.2 pts

All of the following are characteristic of gases except ___.

random, quick motion that is independent of other gasparticles

indefinite volume

indefinite shape

extreme compressibility

very dense

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Question 8 0.2 pts

Two or more gases, when mixed, form a homogeneous mixtureregardless of the identities, properties, or proportions of thegases.

True

False

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Question 9 0.2 pts

Gases have the characteristic physical properties that they dobecause ___.

gas particles move very quickly

gas particles are very far apart, relatively speaking

gas particles act independently of each other

gas particles move randomly

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Question 10 0.2 pts

Pressure is ___.

force:-:area

force:+:area

frac{force}{area}

force:x:area

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Question 11 0.2 pts

All of the following are units of gas pressure except ___.

pound per square inch (psi)

liter (L)

millimeters of mercury (Hg)

atmosphere (atm)

inches of mercury (in Hg)

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Question 12 0.2 pts

All of the following are units of pressure except __.

torr

Pascal (Pa)

kilopascal (kPa)

Galileo (gal)

bar