Chemistry Chapter 8 Study Guide

Fill in the blank: Helium, which is less dense than air, is often used to (a)   balloons.

• inflate

• lift

• fill

• float

Carbon dioxide (CO2) and nitrous oxide (N2O) are both (a)   at room temperature.

• solids

• plasma

• liquids

• gases

What is a molecule?

• A single atom with no bonds.

• A group of atoms joined together by metallic bonds.

• A charged group of atoms joined together by ionic bonds.

• A neutral group of atoms joined together by covalent bonds.

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Fill in the blank: An oxygen molecule is an example of a (a)   molecule, a molecule that contains two atoms.

• diatomic

• monatomic

• polyatomic

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Fill in the blank: Water is an example of a (a)   compound.

• covalent

• ionic

• molecular

• metallic

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A molecular formula represents the composition of a compound by showing:

• the types and numbers of atoms present in the molecule.

• the physical state of the compound.

• the color and texture of the compound.

• the taste and smell of the compound.

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What does a molecular formula not tell you about a molecule’s structure?

• The arrangement of atoms

• The types of atoms present

• The total mass of the molecule

• The number of each type of atom

Fill in the blank: The molecular structure of water shows how the (a)   atom is in the middle between the hydrogen atoms.

• sulfur

• oxygen

• nitrogen

• carbon

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What is the arrangement of atoms within a molecule called?

• Molecular structure

• Atomic structure

• Chemical structure

• Elemental structure

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How many hydrogen atoms are in one molecule of ethanol (C2H6O)?

• 6

• 7

• 5

• 4

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