Before: molecules move around each other, After: molecules move in place

Before, the substance was a liquid and later a solid.

Before, the substance was a solid and later a liquid.

Before,the substance was a gas, and later a liquid.

Before,the substance was a liquid, and later a gas.

If energy is taken out of the substance, and the substance changed into a liquid,

the substance started as a solid

the substance started as a liquid

What happens to molecules when kinetic energy increases?

it depends on the types of molecules

How would you describe the way molecules move when the molecules are solid?

the molecules are moving in place.

the molecules are moving around each other.

the molecules are moving away from each other.

What happens to molecules when energy transfers out of a substance?

The substances's molecules will move slower.

The substance's molecules will move faster.

The substance's molecules will continue to move at the same speed.

The substance's molecules will stop moving.

When the temperature of matter decreases the particles ...

slow down and move closer together

speed up and move farther apart

speed up and move closer together

slow down and move farther apart

Suppose you pour a glass of ice water and set it on the kitchen table. After a few minutes, the outside of the glass will be covered with drops of water. Why did this happen?

Water vapor in the air cooled and condensed onto the cold glass.

Oxygen in the air cooled and condensed onto the cold glass.

Water vapor in the air cooled and evaporated onto the cold glass.

Water seeped through pores in the glass.

Alex noticed that a metal door that sticks on hot days does not stick when it cools off at night. This is because the metal contracts as it cools. The reason for this is that, as the metal cools, the atoms

slow down and move closer together.

become smaller and take up less space.

merge together to form fewer atoms.

speed up and move farther apart.

A student left a sealed jar of water in her freezer. When she returned twelve hours later, the water had changed phase and was a solid. What happened to the water molecules?

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

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

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

Cesar and Ming were investigating a see-through container of water. Water can be a solid, liquid, or gas. At first, Cesar and Ming said the water molecules were moving in place. Later , the water molecules were moving around each other. What change did they observe to the water?

At first, the water was a solid. Later, it was a liquid.

At first, the water was a gas. Later, it was a liquid.

At first, the water was a liquid. Later, it was a solid.

You have decided to start sealing all your letters with glittery wax because you are so "cool". Which answer BEST explains what you must do to make the SOLID wax a LIQUID?

In order to make the SOLID wax a LIQUID you must ADD HEAT ENERGY by putting the wax over a FLAME.

In order to make the SOLID wax a LIQUID you must ADD HEAT ENERGY by putting the wax in the FREEZER.

In order to make the SOLID wax a LIQUID you must REMOVE HEAT ENERGY by putting the wax in an OVEN.

You are relaxing on some grass when you notice LIQUID water droplets have begun to seemingly disappear off the grass leaves. Which answer BEST explains what PHASE CHANGE has occurred AND how the molecule ARRANGEMENT has changed?

The PHASE CHANGE that has occurred is EVAPORATION and the molecule ARRANGEMENT has become FARTHER APART.

The PHASE CHANGE that has occurred is FREEZING and the molecule ARRANGEMENT has become CLOSER.

The PHASE CHANGE that has occurred is MELTING and the molecule MOVEMENT has become FASTER.

You watch your science teacher put a balloon in a bowl of liquid nitrogen and see the balloon has shrunk like a raisin. Which answer BEST explains how you know if HEAT ENERGY been ADDED or REMOVED.

HEAT ENERGY has been REMOVED. I know this because the balloon has become SMALLER meaning the molecule ARRANGEMENT is CLOSER.

HEAT ENERGY has been ADDED. I know this because the balloon has become LARGER meaning the molecule ARRANGEMENT is FARTHER APART.

HEAT ENERGY has actually stayed the SAME. I know this because the balloon has NOT CHANGED meaning the molecule ARRANGEMENT is also NOT CHANGED.

Phase Change

Authored by Jamie Sodorff

Science

7th - 8th Grade

NGSS covered

Used 19+ times

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30 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When a substance melts, the kinetic energy _____________.

decreases

stays the same

increases

decreases then increases

Tags

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When molecules flow around each other, they are in this phase

solid

liquid

gas

plasma

Tags

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Sam had a solid and added energy to it. What did the molecules look like?

The molecules moved in place.

The molecules moved away from each other.

The molecules didn't move.

The molecules moved around each other.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the energy that an object has because it is moving?

kinetic

potential

electric

wind

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What takes place when a liquid changes to a gas?

condensation

melting

vaporization

freezing

Tags

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What takes place when a solid changes to a liquid?

condensation

melting

evaporation

freezing

Tags

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the average kinetic energy of a substance called?

volume

temperature

pressure

movement

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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Phase Change

When a substance melts, the kinetic energy _____________.

When molecules flow around each other, they are in this phase

Sam had a solid and added energy to it. What did the molecules look like?

What is the energy that an object has because it is moving?

What takes place when a liquid changes to a gas?

What takes place when a solid changes to a liquid?

What is the average kinetic energy of a substance called?

What takes place when a liquid changes to a solid?

What takes place when a gas changes to a liquid?

Before: molecules move around each other, After: molecules move in place

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