The medicine has molecules that are moving around each other. The doctor needs to slow down the molecules to cause a phase change. How will he do this & how will it affect the medicine? He transfers energy ...

out of the medicine until it is a solid.

out of the medicine until it is a liquid.

into the medicine until it is a gas

into the medicine until it is a liquid.

At room temperature, both foods are liquids. The same amount of energy was transferred into both substances. Later, one had changed phase while the other hadn't. Which food changed phase, and how did it change?

The sweet food changed because the molecules were able to move fast enough to overcome the attraction between them. Its molecules now move away from each other.

The sour food changed because the molecules were able to move fast enough to overcome the attraction between them. Its molecules now move in place.

How does the temperature of the bottom chair compare with the temperature of the top chair before the chairs touch? What will happen after the chairs have been touching for a while?

Before they touch, the bottom chair is hotter than the top chair. Once the chairs are touching, the bottom chair will transfer KE to the molecules in the cooler top chair until both chairs reach the same temp.

Before they touch, the bottom chair is cooler than the top chair. Once the chairs are touching, the top chair will transfer KE to the molecules in the cooler bottom chair until both chairs reach the same temp.

Before the chairs touch, the chairs are different temperatures. Once the chairs are touching, both KE and cold energy will transfer between the molecules in the two chairs until both chairs reach the same temperature.

Before they touch, the bottom is hotter than the top. Once they are touching, the cooler top chair will gain KE until the molecules in both chairs have an energy of 35, because hotter things increase temp of cooler thing

What happens to molecules when their kinetic energy decreases?

It depends on the type of molecules.

Dean is making chocolate. In part of the chocolate-making process, he changed the phase from a liquid to a solid. What happened to the molecules of chocolate when it changed phase?

Before changing phase, the molecules were moving around each other. After changing phase, they were moving in place.

Before changing phase, the molecules were moving away from each other. After changing phase, they were moving around each other.

Before changing phase, the molecules were moving in place. After changing phase, they were moving around each other

Before changing phase, the molecules were moving around each other. After changing phase, they were moving away from each other.

Before an airplane took off, the temp of the fuel was 27°C. After the airplane had been flying for 1 hour, the temp of the fuel had decreased to 3°C. Which of the following must have happened to the molecules of the fuel

The molecules started moving slower

The molecules became smaller in size.

The molecules got farther apart

What happens to the molecules of the wax when the temperature of the wax decreases?

The energy of the molecules of the wax decreases

The energy of the molecules of the wax increases.

The cold energy of the molecules of the wax increases.

A substance was found whose molecules were moving around each other. The speed of the substance’s molecules increased causing a phase change. How did this happen & how did it affect the substance? Energy was transferred

into the substance, and the substance changed into a gas.

out of the substance, and the substance changed into a solid.

into the substance, and the substance changed into a liquid.

out of the substance, and the substance changed into a liquid.

A scientist has a container with a substance inside. At first, the molecules in the substance move away from each other. Later, the molecules move around each other. What change did the scientist observe in the substance

Before, the substance was a gas. Later, it was a liquid.

Before, the substance was a liquid. Later, it was a gas.

Before, the substance was a solid. Later, it was a liquid.

Before, the substance was a liquid. Later, it was a solid.

Which object has molecules that are moving?

Both have molecules that are moving.

Only the water in the glass has molecules that are moving.

Only the water in the ocean has molecules that are moving.

Neither has molecules that are moving.

At first, a substance’s molecules are moving around each other. What will happen to the substance if energy is transferred into the substance causing phase change? After the phase change, the molecules will move...

faster, and the substance will be a gas.

slower, and the substance will be a solid.

faster, and the substance will be a liquid.

slower, and the substance will be a liquid.

The diagram describes the movement of molecules in a substance used to make fuel. What change did the fuel scientist observe in the substance?

Before the process, the substance was a liquid. After the process, it was a gas.

Before the process, the substance was a solid. After the process, it was a liquid.

Before the process, the substance was a gas. After the process, it was a liquid.

Before the process, the substance was a liquid. After the process, it was a solid.

What happened to the water molecules?

Before the student left, the molecules were moving in place. After, the molecules were moving around each other.

Before the student left, the molecules were moving around each other. After, the molecules were moving away from each other.

Before the student left, the molecules were moving around each other. After, the molecules were moving in place.

Before the student left, the molecules were moving away from each other. After, the molecules were moving around each other

Miles puts a piece of toast on a plate. The toast is hot from the toaster. When he puts the toast on the plate, the energy of the plate increases. What must be true of the energy of the toast?

Its energy increases while the energy of the glass decreases.

Its energy stays the same while the energy of the plate increases.

Its energy increases while the energy of the plate increases.

How does the temperature of the garage bucket compare with the temperature of the outside bucket before the buckets touch? What will happen after the buckets have been touching for a while?

Before they touch, the garage bucket is hotter than the outside bucket. Once they are touching, the garage bucket will transfer KE to the molecules in the cooler outside bucket until both buckets reach the same temp.

Before the buckets touch, the two buckets are different temperatures. Once the buckets are touching, both KE and cold energy will transfer between the molecules of the two buckets until both buckets reach the same temp.

Before they touch, the garage bucket's hotter than outside bucket. Once touching, the cooler outside bucket will gain KE until molecules of both have an energy of 18, because hotter things increase temp of cooler things.

Before they touch, the garage bucket is cooler than the outside bucket. Once the buckets are touching, the hotter outside bucket will transfer KE to the molecules in the cooler garage bucket until both reach same temp.

After the pans have been touching for a while, which of the two bottom pans will be cooler, and why?

The larger bottom pan will be cooler than the smaller bottom pan, because the energy that transferred to it will have spread out over more molecules.

The smaller bottom pan will be cooler than the larger bottom pan, because less energy has to transfer for the molecules to reach the same temperature as the molecules of the top pan.

The larger bottom pan will be cooler than the smaller bottom pan. It started with more total energy, so less energy had to transfer for both pans to reach the same total energy.

Both pans will be the same temperature because both of the top pans had the same amount of energy to transfer and the molecules in the bottom pans start with the same energy.

After the bricks have been touching for a while, whose top brick will be cooler?

Sheila’s top brick will be cooler than Ralph’s top brick, because the energy that transferred to Sheila’s was spread out over more molecules.

Ralph’s top brick will be cooler than Sheila’s top brick, because less energy has to transfer for Ralph’s brick’s molecules to reach the same temperature as the molecules of his bottom brick.

Both will be the same temperature, because both bottom bricks had the same amount of energy to transfer and the molecules in the top bricks started with the same energy.

Sheila’s top brick will be cooler than Ralph’s top brick, because Sheila’s started with more total energy, so less energy had to transfer for both her bricks to reach the same total energy.

What happens to the molecules of the rice when the temperature of the rice increases?

The energy of the molecules in the rice increases.

More heat molecules combine with the molecules in the rice.

The cold energy of the molecules in the rice decreases.

The energy of the molecules in the rice decreases.

How does the temperature of the outer layer compare with the temperature of the inner layer before the layers touch? What will happen after the layers have been touching for a while?

Before the layers touch, the outer layer is hotter than the inner layer. Once the layers are touching, the outer layer will transfer KE to the molecules in the cooler inner layer until both layers reach the same temp.

Before they touch, the outer layer is cooler than the inner layer. Once the layers are touching, the inner layer will transfer KE to the molecules in the cooler outer layer until both layers reach the same temp.

Before they touch, the outer is hotter than the inner. Once they are touching, the cooler inner will gain KE until the molecules of both have an energy of 90, because hotter things increase the temp of cooler things.

Before the layers touch, the layers are different temperatures. Once the layers are touching, kinetic energy and cold energy will transfer between the molecules in the two layers until both layers reach the same temp.

After the laptops have been touching for a while, will Sam’s laptop or Odessa’s laptop be cooler, and why?

Odessa’s laptop will be cooler than Sam’s laptop, because the energy that transferred to Odessa’s was spread out over more molecules.

Odessa’s laptop will be cooler than Sam’s laptop, because Odessa’s started with more total energy, so less energy has to transfer for her and Arun’s laptops to reach the same total energy.

Both laptops will be the same temperature, because both Arun’s and Mari’s laptops had the same amount of energy to transfer and the molecules in Sam’s and Odessa’s laptops started with the same energy.

Sam’s laptop will be cooler than Odessa’s laptop, because less energy has to transfer for the molecules of Sam’s laptop to reach the same temperature as the molecules of Arun’s laptop

Engineers design computers to cool down quickly so they do not break. What happens to the molecules in a computer when the temperature of the computer decreases?

The energy of the molecules in the computer decreases.

The energy of the molecules in the computer increases.

The computer loses heat molecules.

The cold energy of the molecules in the computer increases.

How does the temperature of the front pipe compare with the temperature of the back pipe before the pipes touch? What will happen after the pipes have been touching for a while?

Before they touch, the front is hotter than the back. Once they are touching, the front will transfer KE to the molecules in the cooler back pipe until both pipes reach the same temperature.

Before the pipes touch, the front pipe is cooler than the back pipe. Once the pipes are touching, the back pipe will transfer kinetic energy to the molecules in the cooler front pipe until both pipes reach the same temp

Before the pipes touch, the two pipes are different temperatures. Once the pipes are touching, the kinetic energy and cold energy will transfer between the molecules in the two pipes until both pipes reach the same temp

Before they touch, the front is hotter than the back. Once the pipes are touching, the cooler back will gain KE until the molecules in both have an energy of 100, because hotter things increase the temp of cooler things

After the gears have been touching for a while, which of the two bottom gears will be cooler, and why?

The larger bottom gear will be cooler than the smaller bottom gear, because the energy that transferred to it was spread out over more molecules.

The smaller bottom gear will be cooler than the larger bottom gear, because less energy has to transfer for the molecules to reach the same temperature as the molecules of the top gear

Both gears will be the same temperature, because both of the top gears had the same amount of energy to transfer and the molecules in the bottom gears start with the same energy.

The larger bottom gear will be cooler than the smaller bottom gear. It started with more total energy, so less energy had to transfer for both gears in Set B to reach the same total energy.

Anh measured the temp of a pond. Before school, the water in the pond was 18°C. After school, the temperature of the pond was higher than it was in the morning. What happened to the water molecules while he was at school

The molecules started moving faster

The molecules got closer together.

What happens to the molecules in the ground when the temperature of the ground increases?

The energy of the molecules in the ground increases.

More heat molecules combine with the molecules in the ground.

The cold energy of the molecules in the ground decreases.

The energy of the molecules in the ground decreases.

Will the properties of the two samples likely be the same or different?

The properties will likely be different because the repeating groups of atoms that make up each sample are different.

The properties will likely be different because there are more repeating groups of atoms in Sample 2.

The properties will likely be the same because the repeating groups of atoms that make up the two samples have the same number of atoms.

The properties will likely be the same because the repeating groups of atoms that make up the two samples have two of the same types of atoms.

Will the properties of the two samples likely be the same or different?

The properties will likely be different because the repeating groups of atoms that make up each sample are different.

The properties will likely be the same because the repeating groups of atoms that make up the two samples have one of the same types of atoms.

The properties will likely be different because there are more repeating groups of atoms in Sample 1.

The properties will likely be the same because the repeating groups of atoms that make up the two samples have the same number of atoms.

Will the properties of the two samples likely be the same or different?

The properties will likely be different because the repeating groups of atoms that make up the two samples have different numbers of atoms.

The properties will likely be the same because both samples are liquids at room temperature.

The properties will likely be the same because the repeating groups of atoms that make up the two samples have the same types of atoms

The properties will likely be different because there are more repeating groups of atoms in Sample 1.

Soup in the pot is hot, and soup in the freezer is cold. What's the difference between the molecules of the soup in the pot and the molecules of the soup in the freezer?

The molecules of the soup in the pot are moving faster than the molecules of the soup in the freezer.

The molecules of the soup in the pot are moving and the molecules of the soup in the freezer are not moving.

The molecules of the soup in the freezer are smaller than the molecules of the soup in the pot.

There is no difference because all of the soup is made of the same type of molecules

Will the other properties of the two samples be the same or different?

The other properties will be the same because the repeating groups of atoms that make up the two samples are the same.

The other properties will be the same because both samples are gases at room temperature.

The other properties will be different because there are more repeating groups of atoms in Sample 2.

The other properties will be the same because both samples are green at room temperature.

What happens to the molecules of a substance when energy is transferred into it and it changes from a solid to a liquid?

The molecules move faster and move around each other.

The molecules move in place without changing position.

The molecules move slower and come closer together.

The molecules stop moving completely.

When a gas is cooled and becomes a liquid, what happens to the kinetic energy of its molecules?

The kinetic energy fluctuates randomly.

The kinetic energy remains the same.

Sem 1 Final Exam Review 24-25

Authored by Audra DeBourge

Science

8th Grade

NGSS covered

Used 2+ times

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47 questions

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

Miles pours some iced tea into a glass. When he puts the iced tea in the glass, the energy of the glass decreases. What must be true of the energy of the iced tea?

Its energy stays the same while the energy of the glass decreases.

Its energy decreases while the energy of the glass decreases.

It is impossible to know without data on the number of molecules in each object.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

MULTIPLE CHOICE QUESTION

1 min • 1 pt

At room temp, 2 substances are liquid. The same amount of energy is transferred out of both substances. Now, substance 1 changed phase but 2 didn't. How are they different? Substance 1 has a ...

stronger attraction between its molecules than Substance 2. Its molecules now move in place.

stronger attraction between its molecules than Substance 2. Its molecules now move away from each other.

weaker attraction between its molecules than Substance 2. Its molecules now move in place.

weaker attraction between its molecules than Substance 2. Its molecules now move around each other.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Jasper's bicycle is made of aluminum. When are the aluminum molecules in his bicycle moving? The aluminum molecules are . . .

always moving

never moving

only moving when Jasper is riding his bicycle.

only moving when Jasper is not riding his bicycle.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

At room temp, both substances are liquids. The same amount of energy was transferred into both substances. Only the pink one changes phase. How is the pink one different from the green one? The pink substance has a ...

stronger attraction between its molecules than the green substance. Its molecules move around each other.

weaker attraction between its molecules than the green substance. Its molecules now move in place.

weaker attraction between its molecules than the green substance. Its molecules now move away from each other.

stronger attraction between its molecules than the green substance. Its molecules now move away from each other.

Tags

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

First, the water is a liquid. Then, energy was transferred out of the substance, and the water changed phase. What happened to the movement of the water molecules? After the phase change, the water molecules moved ...

slower and started moving in place.

slower and started moving around each other.

faster and started moving away from each other.

faster and started moving around each other.

Tags

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

At room temp, both substances are liquid. When the same amount of energy was transferred out of both substances, only one changed phase while the other didn't. Which substance changed phase, and how did it change?

Substance R changed phase because the weak attraction between molecules let them move faster. Its molecules now move around each other.

Substance Q changed phase because the strong attraction between molecules made their movement slower. Its molecules now move in place.

Substance R changed phase because the attraction was able to overcome the slower molecules. Its molecules now move away from each other

Substance Q changed phase because the attraction of the molecules was able to overcome their slower movement. Its molecules now move in place.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Eli and Jen are camping and have potatoes to eat. Jen put her potato in the campfire for a while, but Eli didn't. Now Jen's potato has a high temperature. What's the difference between the molecules of the two potatoes?

The molecules of Jen’s potato are moving and the molecules of Eli’s potato are not moving.

The molecules of Eli’s potato are smaller than the molecules of Jen's potato.

The molecules of Jen's potato are moving faster than the molecules of Eli’s potato.

There is no difference because both potatoes are made of the same type of molecules.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

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Sem 1 Final Exam Review 24-25

Miles pours some iced tea into a glass. When he puts the iced tea in the glass, the energy of the glass decreases. What must be true of the energy of the iced tea?

At room temp, 2 substances are liquid. The same amount of energy is transferred out of both substances. Now, substance 1 changed phase but 2 didn't. How are they different? Substance 1 has a ...

Jasper's bicycle is made of aluminum. When are the aluminum molecules in his bicycle moving? The aluminum molecules are . . .

At room temp, both substances are liquids. The same amount of energy was transferred into both substances. Only the pink one changes phase. How is the pink one different from the green one? The pink substance has a ...

First, the water is a liquid. Then, energy was transferred out of the substance, and the water changed phase. What happened to the movement of the water molecules? After the phase change, the water molecules moved ...

At room temp, both substances are liquid. When the same amount of energy was transferred out of both substances, only one changed phase while the other didn't. Which substance changed phase, and how did it change?

Eli and Jen are camping and have potatoes to eat. Jen put her potato in the campfire for a while, but Eli didn't. Now Jen's potato has a high temperature. What's the difference between the molecules of the two potatoes?

The medicine has molecules that are moving around each other. The doctor needs to slow down the molecules to cause a phase change. How will he do this & how will it affect the medicine? He transfers energy ...

How is the kinetic energy of molecules changing when the molecules move faster? The kinetic energy . . .

At room temperature, both foods are liquids. The same amount of energy was transferred into both substances. Later, one had changed phase while the other hadn't. Which food changed phase, and how did it change?

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