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Science
6th -
8thgrade
States of Matter and Changes of State Unit Test
22 questions
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- 1. Multiple Choice
Thermal energy is transferred away from a sample of water vapor (steam). Which of these best describes the change of state that occurs?
condensation from point A to point B
vaporization from point A to point B
condensation from point B to point C
- 2. Multiple Choice
A pot containing water is warmed on a stove top. What is true about the number of water particles in the pot after the water has been warmed?
There are fewer water particles after warming since some of the water particles turned into air.
There are more water particles after warming since some have split to become gaseous particles.
The number of water particles is the same after warming, including the liquid and gaseous particles.
- 3. Multiple Choice
Which statement describes the particles in a gas?
Gas particles are spaced far apart and move around freely.
Gas particles are tightly packed together and move past each other freely.
Gas particles are spaced far apart and move around slowly.
- 4. Multiple Choice
Dry ice is the common name for frozen CO2. As the temperature warms the frozen CO2 becomes CO2 gas without entering a liquid form.
Circle the picture that correctly models the change in state of CO2 that occurs.
- 5. Multiple Choice
A scientist is studying a volcano. She claims that the lava that comes out of the volcano is a liquid. She wants to make an argument to support her claim. What question should she ask to help her collect evidence for her argument?
Does the lava have a definite volume and particles that are very far apart?
Does the lava have a definite volume and does it flow freely?
Is the lava made of particles that move around?
- 6. Multiple Choice
Liquid copper is removed from a smelting furnace and left to cool until it undergoes a change of state. Which pair of diagrams illustrate the liquid copper particles during the change in state that occurs?
- 7. Multiple Choice
Igloos are buildings that are made of packed snow. Which statement describes the particles that make up the igloo?
The particles in the snow have some kinetic energy, but the particles only move around in place.
The particles in the snow melt easily because they have more kinetic energy than liquid water.
The particles in the snow have no kinetic energy.
- 8. Multiple Choice
Ice is melted on a hot plate, describe the thermal energy flow over the course of a few minutes. Why is there a period of time when the ice does not rise in temperature?
When ice reaches its boiling point, thermal energy caused bubbles to form and the temperature does not rise.
When ice reaches its melting point, thermal energy does not increase temperature because it is being used to create a change of state from solid to liquid.
When ice reaches its melting point, thermal energy flows away until the ice melts.
- 9. Multiple Choice
Gas has what volume and shape?
volume- definite
shape- definite
volume- definite
shape- not definite
volume- not definite
shape- not definite
volume- not definite
shape- definite
- 10. Multiple Choice
A liquid is placed in an area with lower temperature. Thermal energy will __________. For the particles in the liquid, the kinetic energy and the motion will __________. The liquid will change state only if __________.
Increase in the liquid, decrease, the liquid is warmed
Increase in the surroundings, decrease, enough thermal energy is added or moved
Not change, stay the same, the surroundings are warmed
- 11. Multiple Choice
A scientist boils Sample A (water) and records various temperatures. Sample B (water) is left alone for a period of time. Both samples have a change in volume.
Water is changing its state throughout the sample.
In sample A
In sample B
In both samples
Neither
- 12. Multiple Choice
A scientist boils Sample A (water) and records various temperatures. Sample B (water) is left alone for a period of time. Both samples have a change in volume.
Sample A evaporated
Sample B evaporated
Both samples evaporated
- 13. Multiple Choice
Fire extinguishers store carbon dioxide under pressure in liquid form. When used, gas is released. With a decrease in pressure _________ thermal energy is needed for a change in state.
less
more
the same amount
- 14. Multiple Choice
For solids, liquids and gas
Particles are always constantly colliding
Particles collide often in gases because they move rapidly
Particles do not collide often in gases because particles are spaced far apart
- 15. Multiple Choice
A scientist boils Sample A (water) and records various temperatures. Sample B (water) is left alone for a period of time. Both samples have a change in volume.
Water is changing state at the surface....
Both Samples
In sample B
In sample A
- 16. Multiple Choice
Water boils in an open pot at 100 C and in a pressure cooker at 116 C. Which has more energy?
The pressure cooker water has more energy because it boiled faster.
The water in an open pot has more energy because it boiled at a lower temperature.
The pressure cooker water has more energy because it has absorbed more thermal energy to raise the temperature past its boiling point.
- 17. Multiple Choice
Which description is in correct order, from lowest total thermal energy to highest?
Some attract forces are present; Attractive forces increase from no attraction to some attraction
Attractive forces between particles exist; Strong forces of attraction exist between particles
Strong forces of attraction exist, Attractive forces have stopped
- 18. Multiple Choice
Bees living in a honey comb resemble states of matter. Which is correct.
Mature bees leaving the hive are like liquid and Mature bees roaming the hive are like gas
The honeycomb storing larvae are like liquid and Mature bees roaming the hive are like gas
Mature bees leaving the hive are like gas and the honeycomb storing larvae are like solids
- 19. Multiple Choice
Jars are used to cook and store vegetables. If the jars are removed from a boiling pressure cooker, which is true of water molecules in the cooker?
They will change states back into a liquid
They will collide with the walls of the pressure cooker less often
They will collide with each other more often
- 20. Multiple Choice
Why does it take less energy to boil water at higher elevations?
Lower pressure allows water molecules to easily turn into a gas
Higher pressure allows water molecules to stay as a liquid longer
Lower pressure allows water molecules to stay as a liquid longer
- 21. Multiple Choice
Ice water has the same temperature after 20 minutes, but less ice is visible. Why does the temperature stay the same?
Thermal energy was absorbed. It raises the temperature of the ice water.
Thermal energy is expelled. It raises the temperature of the surroundings.
Thermal energy was absorbed. It was used to change ice into a liquid and does not raise the temperature.
- 22. Multiple Choice
An experiment needs to measure how surface area affects melting ice in water. Which are control variables?
Initial ice mass and Initial water temperature
Air humidity and initial surface area of ice
Initial water temperature and the mass of water after the ice melts
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