AnswersSVHS Chemistry 1 FAUnit Test

Ionic Bonding Answers

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21
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Which best explains the relationship between evaporation and temperature?

A
A liquid evaporates slower at lower temperatures because the molecules are more spread apart and are not pushed as easily from the liquid’s surface.
B
A liquid evaporates faster at lower temperatures because the attractions are decreased and more particles can escape the surface of the liquid.
C
A liquid evaporates slower at higher temperatures because the vapor pressure of the liquid is higher, so fewer molecules can escape the surface.
D
A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.
22
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A student performs the following experiment.Step 1: She pours a colorless solution into a beaker that contains another colorless liquid. Yellow particles appear in the liquid.Step 2: She lets the yellow particles settle in the beaker and then separates the colorless liquid by decantation.What has most likely occurred in the beaker?

A
a chemical change in step 1 and a physical change in step 2
B
a physical change in step 1 and a chemical change in step 2
C
chemical changes in both step 1 and step 2
D
physical changes in both step 1 and step 2
23

A student investigated some properties of lead and recorded the findings in the table below.PropertyObservationcolordull graydensity11.3 g/cm3volume of sample3.00 cm3melting point327°Creaction with airlead oxide forms on the surfaceelectrical conductivityconducts some electricityWhich statement is true with respect to the investigation?

A
The student investigated only the physical properties of lead.
B
The student investigated only the chemical properties of lead.
C
The student investigated more physical properties than chemical properties of lead.
D
The student investigated more chemical properties than physical properties of lead.
24

Which type of substance is water able to dissolve?

A
nonpolar
B
ionic
C
polar
D
ionic and polar
25

Which reason best explains why plasmas are good conductors of electricity?

A
They have mobile charged particles.
B
They are at extremely high temperatures.
C
They are made up of particles in fixed positions.
D
They have slow-moving nuclei that carry electricity.

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Ionic Bonding Answers — SVHS Chemistry 1 FA