Apply Its_Middle School Physical Science - Mastery Assess It_2

10/20/2016 Apply Its_Middle School Physical Science Mastery Assess It_2

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Mastery Assess It 2

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1. Which statements are accurate in describing what happens when heat is applied to air?

a. Air molecules become lighter. You are correct! Air molecules become lighter as heat is added. b. Air molecules become heavier.

Great effort, but air molecules cannot become lighter and heavier at the same time.c. Air molecules become less densely packed, and start to separate.

You are correct! As heat is added, air molecules move apart, decreasing density. d. all of these

Great effort, but at least one of the statements above is not true.

2. Which substance will melt first?

a. They will melt at the same time. Great effort, but these substances do not all have the same melting point.b. Wax

Great effort, but wax has a higher melting point than at least one of the substances on this list.c. Butter

You are correct! Butter will melt first because it has the lowest melting point.d. Chocolate

Great effort, but chocolate has a higher melting point than at least one of the substances on this list.

3. What happens to water molecules as temperature increases?

a. The molecules move slower, and if the temperature reaches the freezing point of water, a change of phase will occur. Great effort, but if temperature is increased, the molecules in water will move faster, which could cause water to change from a liquid to a gas. b. A change in temperature has no effect on the movement of water molecules.

Great effort, but a change in temperature will cause molecules to move either faster, if the temperature goes up, or slower, if the temperature goesdown.

c. The molecules move faster, and if the temperature reaches the boiling point of water, a change of phase will occur.

You are correct! An increase in temperature will cause the molecules in water to move faster, which may result in water changing from a liquid to agas!

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4. Which statement is true?

a. As a gaseous state, water molecular bonds no longer stick together and move around rapidly. This statement is true, but it is not the only true statement!b. As a solid state, water molecules are packed closely together.

This statement is true, but it is not the only true statement!c. As a liquid state, water molecular bonds weaken and constantly move around.

This statement is true, but it is not the only true statement!d. all of these

Correct! All of the statements are true.

5. Matter is anything that:

a. that has density and volume Great effort, but density, while a physical property of matter, is not used to determine what makes up matter.b. that has density and mass

Great effort, but density, while a physical property of matter, is not used to determine what makes up matter.c. that has temperature and mass

Great effort, but while temperature is a measurement of the movement of particles in matter, it is not a component that defines matter.d. that has mass and takes up space

You are correct! Matter is defined as anything that has mass and volume!

6. Which of the following correctly describes how the molecules of matter in a solid phase behave?

a. Molecules are very close together, and moving quickly. Close, but the molecules of matter in the solid phase are moving very slowly.b. Molecules are very close together, and moving very slowly.

You are correct! Because of how tightly the molecules are packed together in it's solid phase, they move very slowly.c. Molecules are spaced very far apart and are moving quickly

Great effort, but this is how the molecules of matter behave when in the gas phase, such as steam. d. Molecules are spaced out a bit, but not too far, and move around freely.

Great effort, but this is how the molecules of matter behave in when in the liquid phase, such as water.

7. Which best describes the properties of a solid?

a. Molecular attraction is less than energy of motion. Great effort, but this is true of a gas. Which would be true of a solid?b. Molecular attraction and energy of motion are about the same.

Great effort, but this is true of a liquid. Which would be true of a solid?c. Molecular attraction is greater than energy of motion.

You are correct! Molecular attraction is greater than energy of motion when matter in a solid form. d. The correct answer is not shown.

Great effort, but at least one of the answers above is correct.

8. Which best describes the properties of a gas?

a. Molecular attraction is less than energy of motion. Correct! Energy of motion overwhelms molecular attraction.b. Molecular attraction and energy of motion are about the same.

Great effort, but this is more true of liquids than of gases.c. Molecular attraction is greater than energy of motion.

Great effort, but gases have higher energy levels. These high energy levels would overwhelm the molecular attraction.d. The correct answer is not shown.

Great effort, but one of the above statements is true.



9. Which choice correctly defines melting point?

a. The melting point can be defined as the temperature when a solid melts to become a liquid. You are correct! Melting is what occurs when a solid turns into a liquid.b. The boiling point and the melting point of a substance is the same temperature.

Great effort, but the melting point of a substance is always lower than its boiling point. c. The melting point is the temperature at which a liquid becomes a liquid.

Great effort, but a liquid is already a liquid. d. The correct answer is not shown.

Great effort, but at least one of the above answers is correct.

10. Which is NOT true about the process known as sublimation?

a. The process of a gas turning into a liquid. Correct! This statement describes the condensation point.b. When snow evaporates after weeks of freezing cold weather.

Great effort, but this is true of sublimation. c. The process of a substance changing from a solid like ice to a gas like water vapor.

Great effort, but this is true of sublimation. d. Snow changes into water vapor.

Great effort, but this is true of sublimation.

11. Under which condition will ice melt the fastest?

a. 50 degrees plus salt

Great effort, but, ice will melt fastest with a combination of salt and heat. The choice that indicates the highest temperature and salt would be thecondition under which ice would melt the fastest.

b. 60 degrees plus salt Great effort, but ice will melt fastest with a combination of salt and heat. There is a choice that indicates a higher temperature. c. 50 degrees with no salt

Great effort, but ice will melt fastest with a combination of salt and heat.d. 70 degrees plus salt

You are correct! Ice will melt fastest with salt and high temperatures. Of the choices below, 70 degrees is the highest temperature and thus indicatesthe highest amount of heat.

12. The molecules of which phase of matter have the most energy?

a. solid

Great effort, but the molecules of matter in the solid phase do not move around much, and therefore don't have as much energy as the other twophases.

b. liquid

Great effort, and while the molecules of matter in the liquid phase have more energy than than those of matter in the solid phase, they do not have asmuch energy as the molecules in the gas phase.

c. gas

You are correct! Because the molecules in matter that is in the gas phase move around more rapidly than those in the other two phases, gasmolecules have the most energy of the three phases.

13. Which best describes the properties of a liquid?

a. Molecular attraction and energy of motion are about the same. You are correct! Molecular attraction and energy of motion are about the same!b. Molecular attraction is less than energy of motion.

Great effort, but this is true of a gas. Which would be true of a liquid?c. Molecular attraction is greater than energy of motion.

Great effort, but this is true of a solid. Which would be true of a liquid?d. all of these.

Great effort, but at least one of the above answers is incorrect.



14. Temperature and pressure affect the rate at which matter changes phase.

a. True You are correct! A change in temperature and pressure has a significant impacts on matter changing from one phase to another!b. False

Great effort, but the statement is true. A change in pressure can change the temperature at which matter changes from one phase to another.

15. Which choice correctly defines boiling point?

a. The boiling point can be defined as the temperature when a solid melts to become a liquid. Great effort, but this is known as the melting point.b. The boiling point is the temperature when a liquid starts to turn into a gas.

You are correct! Boiling point = liquid to gas!c. The boiling point and the melting point of a substance is the same temperature.

Great effort, but melting and boiling rarely, if ever, occur at the same temperature. d. The correct answer is not shown.

Great effort, but at least one of the above answers is correct.

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Apply Its_Middle School Physical Science - Mastery Assess It_2