Question

1. when heating a substance, which of the following is true

a. particles are moving closer together
b. energy is absorbed
c. heat is removed
d. particles are moving slower
e. temperature is decreasing

1. the state of matter which has the most energy is

a. liquid
b. gas
c. plasma
d. solid

1. based on lab measurements, you calculate that the density of an iron block is 8.29 g/cm³. your lab assistant tells you that the published reference value for iron is 7.87 g/cm³. calculate the %error for your lab:

a. 0.53%
b. 5.34%
c. 5.07%
d. 42.0%
e. 0.051%

1. a state of matter in which a material has no definite shape but has a definable constant volume is the ____________ state.

a. liquid
b. gas
c. plasma
d. solid
matching
select the appropriate state change for the scenarios below. all states are used at least once. states can be used more than once.
a. sublimation
b. evaporation
c. freezing
d. melting
e. condensing

1. heat is added to a liquid until its particles are so far apart it no longer has a constant volume or a definite shape
2. bathroom mirror fogs after a hot shower
3. gas to liquid state change
4. your ice cream pop falls on the sidewalk in summer and becomes a puddle :(
5. heat is removed from a liquid until its particles become ordered and take a definite shape
6. your dunkin donuts pumpkin spice hot coffee emits steam while you sip in the air conditioning
7. solid to liquid state
8. dry ice forms vapor at room temperature

Explanation:

Step1: Answer question 9

When heating a substance, energy is absorbed. Particles move faster and get farther apart, temperature increases. So the answer is b.

Step2: Answer question 10

Plasma has the most energy among the states of matter as the particles are highly ionized and have high - kinetic energy. So the answer is c.

Step3: Answer question 11

The formula for percent error is $\text{Percent Error}=\frac{\vert\text{Experimental Value}-\text{True Value}\vert}{\text{True Value}}\times100\%$. The experimental value of iron density is $8.29\ g/cm^{3}$ and the true value is $7.87\ g/cm^{3}$. $\text{Percent Error}=\frac{\vert8.29 - 7.87\vert}{7.87}\times100\%=\frac{0.42}{7.87}\times100\%\approx5.34\%$. So the answer is b.

Step4: Answer question 12

A liquid has no definite shape but has a definite constant volume. So the answer is a.

Step5: Answer question 13

When heat is added to a liquid until its particles are so far apart it no longer has a constant volume or a definite shape, it turns into a gas. This is evaporation. So the answer is b.

Step6: Answer question 14

When a bathroom mirror fogs after a hot shower, water vapor in the air cools and changes from a gas to a liquid on the mirror surface. This is condensation. So the answer is e.

Step7: Answer question 15

Gas to liquid state change is condensation. So the answer is e.

Step8: Answer question 16

An ice - cream pop falling on the sidewalk and becoming a puddle is a solid (ice - cream) changing to a liquid. This is melting. So the answer is d.

Step9: Answer question 17

When heat is removed from a liquid until its particles become ordered and take a definite shape, it turns into a solid. This is freezing. So the answer is c.

Step10: Answer question 18

Hot coffee emitting steam is evaporation as the liquid water in the coffee changes to water vapor. So the answer is b.

Step11: Answer question 19

Solid to liquid state change is melting. So the answer is d.

Step12: Answer question 20

Dry ice (solid carbon - dioxide) forming vapor at room temperature is sublimation as it changes directly from a solid to a gas. So the answer is a.

Answer:

1. b. energy is absorbed
2. c. plasma
3. b. 5.34%
4. a. liquid
5. b. evaporation
6. e. condensing
7. e. condensing
8. d. melting
9. c. freezing
10. b. evaporation
11. d. melting
12. a. sublimation