AnswersChemistry - SC3210 A-CRLab: Ionic and Covalent Bonds

Lab: Ionic and Covalent Bonds — Unit test Answers

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1
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Which best characterizes a crystal?

A
a number of high speed particles moving randomly
B
a dense substance that is hard and incompressible
C
a high-energy state of matter made up of a swirling, ionized gas
D
a loose association of particles moving past one another
2
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Which is an aspect of the kinetic-molecular theory and can be used to explain the compressibility of plasmas?

A
Particles move independently of one another and are widely spaced.
B
Particle kinetic energy increases with increasing temperature.
C
Particles exert no attractive or repulsive force on one another.
D
Particles always move even when they have fixed positions.
3

Why do amorphous solids not have a long-range order in the arrangement of their particles?

A
Their formation involves very rapid cooling.
B
They do not have enough particles.
C
Their particles eventually change positions.
D
Their particles always stay in the same positions.
4

Which is a postulate of the kinetic-molecular theory?

A
Gas particles have a small volume relative to the spaces between them.
B
Gas particles have a large volume relative to the spaces between them.
C
Gas particles are very small in size and always move slowly.
D
Gas particles are very large in size and always move slowly.
5

A substance conducts an electric current when it is in the liquid state. What would the conductivity of the substance in solid form indicate about the type of bond in the substance?

A
If the solid is conductive, the bonds are ionic.
B
If the solid is not conductive, the bonds are covalent.
C
If the solid is conductive, the bonds are metallic.
D
If the solid is not conductive, the bonds are metallic.
6

The diagrams show gases that are stored in two separate but similar containers.If both gases are at the same temperature, which one has the greater pressure?

Question illustration
A
gas 1 because the particles are moving much faster
B
gas 1 because it has fewer particles that are close together
C
gas 2 because it has more particles that are colliding
D
gas 2 because the particles have more space between them
7

Which statement describes an extensive property of matter?

A
It changes with the color of a substance.
B
It changes when a new substance is formed.
C
It changes with the amount of sample that is present.
D
It changes with the composition of a substance.
8

Which statement describes a chemical property of water?

A
It reacts with sodium metal.
B
It has a melting point of 0°C.
C
It has a density of about 1 g/mL.
D
It is clear and colorless.
9

The diagram below shows the different phase transitions that occur in matter.Which best describes the process that arrow 1 represents?

Question illustration
A
Molecules are speeding up during boiling.
B
Molecules are depositing as ice on a surface.
C
Molecules are slowing down during condensing.
D
Molecules are moving from stationary positions.
10

When the process of condensation occurs, the kinetic energy of particles

A
is insufficient to overcome intermolecular forces.
B
becomes independent of temperature.
C
becomes exactly equal to the intermolecular forces.
D
easily overcomes the intermolecular forces.
11

Which type of bonding involves the complete transfer of a valence electron from a less electronegative atom to a more electronegative one?

A
ionic bonding
B
metallic bonding
C
covalent bonding
D
hydrogen bonding
12

Which commercial technology commonly uses plasmas?

A
a radio
B
a race car
C
a television
D
a microwave oven

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