What is an independent variable in an experiment?

A. The factor that is changed or controlled by the experimenter

B. The factor that is measured or observed

C. The variable that remains constant

D. The conclusion of the experiment

What is an dependent variable in an experiment?

B. The factor that is measured or observed

A. The factor that is changed or controlled by the experimenter

C. The variable that remains constant

D. The conclusion of the experiment

Which of the following best defines a dependent variable?

B. It is the result or outcome that is measured

A. It is what you change in the experiment

D. It is the variable that is not measured

What is a key difference between an independent and a dependent variable?

B. The independent variable is changed, while the dependent variable is measured

A. The independent variable is measured, while the dependent variable is controlled

C. Both are kept constant during the experiment

D. The dependent variable is manipulated, while the independent variable is observed

Article Question: What happens to chocolate when it's placed near a campfire, and why does it change?

It melts because heat makes the molecules move around more.

It burns because its molecules react with oxygen.

It freezes because the fire removes energy.

It evaporates because the temperature is too high.

Article Question: What is the difference between burning and melting?

Melting is a phase change, and burning is a chemical reaction.

Melting turns something into gas, and burning turns it into liquid.

Burning is a phase change, and melting is a chemical reaction.

Both burning and melting are chemical reactions.

a noticeably different form or state of the same substance

What does it mean to refute something?

to provide evidence that goes against a claim

Article Question: What fills the lakes and seas on Titan?

Tar-like substances like methane and ethane

Article Question: Who was Robert Boyle, and what did he discover about air?

An English scientist who discovered that air is matter.

A French scientist who discovered gravity.

An Italian explorer who found new continents.

A German philosopher who studied the stars.

Article Question: How did Boyle’s experiments change how scientists study gases today?

He based his discoveries on physical evidence that could be tested.

He relied on theories from old philosophers.

He used ideas without testing them.

He guessed the properties of air.

Article Question: How do water molecules behave in the liquid phase compared to the solid phase?

They move freely in the liquid phase but are locked in place in the solid phase

They are locked in place in both phases

They flow past each other in both phases

Article Question: What causes a flash flood in a desert, like Antelope Canyon?

Quick rainfall on dry, hard ground

Article Question: Why do the walls of glacier caves in Iceland sparkle in the light?

The solid ice reflects light due to its rigid structure

The ice is covered in reflective minerals

Phase Change Final Study Guide

Authored by Anthony Dake

Science

7th Grade

NGSS covered

Used 5+ times

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67 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When you transfer energy into a substance, what happens to the temperature?

It stays the same

It decreases

It becomes negative

It increases

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When you transfer energy into a substance, what happens to the molecules’ kinetic energy?

It decreases

It increases

It stays the same

It disappears

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Is burning a phase change?

Yes

Trick question none of these are right

It is a chemical reaction

Tags

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When energy is transferred to or from a substance, it can change the molecules’ freedom of movement.

True

Neither true nor false

False

Not enough information

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to the kinetic energy of a substance when it transfers that energy to another substance?

It is converted to potential energy

It stays the same

It loses kinetic energy

It increases its kinetic energy

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is kinetic energy?

a pull between two molecules that is always the same for a substance

the way molecules in a substance move around relative to each other

a group of atoms joined together in a particular way

the energy that an object has because it is moving

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Scenario 1: A student wants to test how different amounts of water affect plant growth. Is this the Independent or Dependent variable? A student adds different amounts of water to each plant to see how it grows.

Independent Variable

Dependent Variable

Tags

NGSS.MS-ETS1-1

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Phase Change Final Study Guide

When you transfer energy into a substance, what happens to the temperature?

When you transfer energy into a substance, what happens to the molecules’ kinetic energy?

Is burning a phase change?

When energy is transferred to or from a substance, it can change the molecules’ freedom of movement.

What happens to the kinetic energy of a substance when it transfers that energy to another substance?

What is kinetic energy?

Scenario 1: A student wants to test how different amounts of water affect plant growth. Is this the Independent or Dependent variable? A student adds different amounts of water to each plant to see how it grows.

Scenario 2: A researcher investigates if the temperature of water affects how fast sugar dissolves. Is this the Independent or Dependent variable? A researcher records how quickly the sugar dissolves.

Scenario 3: A teacher wants to know if study time affects students' test scores. Is this the Independent or Dependent variable? The teacher has students study for different amounts of time.

Scenario 4: An experiment is conducted to determine whether the type of exercise affects heart rate. Is this the Independent or Dependent variable? The researcher measures the heart rate of each participant.

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