Matter Review 2

Question 1

A particle model shows only identical pairs of oxygen atoms (O₂). How should the sample be classified?

Accepted Answer

Element

Answer

Compound

Answer

Mixture

Answer

It cannot be classified because the particles are molecules.

Question 2

A model contains two different kinds of particles mixed together. What is the best classification of the sample?

Accepted Answer

Mixture

Answer

Element

Answer

Compound

Answer

Pure substance

Question 3

A student says, “Any particle made of two atoms must be a compound.” Which evidence shows the student is incorrect?

Accepted Answer

O₂ contains two atoms but only one type of atom.

Answer

H₂O contains hydrogen and oxygen atoms.

Answer

A mixture can contain more than one substance.

Answer

All matter is made of atoms.

Question 4

Two samples have the same color and state of matter, but one has a different characteristic property. What is the best conclusion?

Accepted Answer

The samples may be different substances.

Answer

The samples must be the same substance.

Answer

A chemical reaction definitely occurred.

Answer

The samples must both be mixtures.

Question 5

A liquid begins bubbling during an investigation. Why is bubbling alone not enough to prove a chemical reaction occurred?

Accepted Answer

Bubbles are a clue, but stronger evidence is that a new substance with different properties formed.

Answer

Bubbles can never occur during a chemical reaction.

Answer

Only temperature changes can show a chemical reaction.

Answer

A reaction can occur only when a solid forms.

Question 6

Which observation provides the strongest evidence that the identity of a substance changed?

Accepted Answer

A new substance formed with different characteristic properties.

Answer

The substance was poured into a new container.

Answer

The substance was broken into smaller pieces.

Answer

The amount of the substance decreased.

Question 7

A student heats a substance and observes that its particles move faster. Which change best explains this observation?

Accepted Answer

The temperature increased.

Answer

The pressure must have decreased.

Answer

New atoms formed.

Answer

The substance became a new substance.

Question 8

A sealed container of gas is heated. Which explanation best predicts what happens to the pressure?

Accepted Answer

Pressure can increase because faster particles collide with the container walls more often and/or harder.

Answer

Pressure decreases because heated particles stop colliding with the walls.

Answer

Pressure stays the same because particle motion never changes.

Answer

Pressure disappears because gases have no mass.

Question 9

The same amount of gas is pushed into a smaller container. Which change best explains an increase in pressure?

Accepted Answer

The particles have less space and collide with the walls more frequently.

Answer

The gas particles become larger.

Answer

New gas particles are created.

Answer

The particles stop moving.

Question 10

A student draws a solid with particles spread very far apart. What is the best correction to the model?

Accepted Answer

Show the particles close together in a fixed arrangement.

Answer

Remove all motion from the particles.

Answer

Draw the particles as different types of atoms.

Answer

Show the particles leaving the container.

Question 11

A substance changes from a liquid to a gas. Which statement best describes what happened?

Accepted Answer

The particles remain the same substance, but their motion and spacing change.

Answer

The particles become different types of atoms.

Answer

Some of the matter is destroyed.

Answer

A chemical reaction must have occurred.

Question 12

A model shows 5 red atoms and 6 blue atoms before a reaction. Which after-reaction model follows conservation of matter?

Accepted Answer

5 red atoms and 6 blue atoms arranged differently

Answer

4 red atoms and 6 blue atoms

Answer

5 red atoms and 7 blue atoms

Answer

11 blue atoms

Question 13

Before a reaction there are 12 total atoms. Afterward, a student's model contains 10 atoms. What should the student do?

Accepted Answer

Revise the model so all 12 original atoms are accounted for.

Answer

Leave the model because reactions destroy some atoms.

Answer

Add any two new types of atoms.

Answer

Change the model to show 12 molecules.

Question 14

A reaction occurs in an open container and the measured mass decreases. Which explanation best supports conservation of matter?

Accepted Answer

Matter may have left the container as a gas.

Answer

Some atoms were destroyed during the reaction.

Answer

Mass is not conserved in open systems.

Answer

The reaction changed matter into nothing.

Question 15

Steel wool is left exposed to air and later has more mass. Which explanation best accounts for the increase?

Accepted Answer

Oxygen from the air combined with the iron.

Answer

The iron created new atoms.

Answer

The balance caused the iron to gain matter.

Answer

The iron atoms became larger.

Question 16

Why is counting each type of atom more useful than counting the number of particles when checking a reaction model?

Accepted Answer

Particles can rearrange into different groupings, but each type of atom must still be accounted for.

Answer

The number of particles must always stay the same.

Answer

Atoms can be created as long as particle number stays constant.

Answer

Only compounds contain atoms.

Question 17

A reaction begins at 18°C and ends at 31°C. Which conclusion is best supported by the data?

Accepted Answer

The reaction released energy and was exothermic.

Answer

The reaction took in energy and was endothermic.

Answer

No energy was transferred.

Answer

The reaction destroyed energy.

Question 18

A reaction begins at 29°C and ends at 21°C. Which conclusion is best supported by the data?

Accepted Answer

The reaction took in energy and was endothermic.

Answer

The reaction released energy and was exothermic.

Answer

The reaction created new energy.

Answer

No energy was transferred.

Question 19

Group 1 records 22°C → 30°C. Group 2 records 24°C → 19°C. Which comparison is correct?

Accepted Answer

Group 1 shows energy released; Group 2 shows energy taken in.

Answer

Both groups show energy released.

Answer

Both groups show energy taken in.

Answer

Group 1 shows energy taken in; Group 2 shows energy released.

Question 20

A student says, “The reaction cooled from 27°C to 20°C, so energy was released.” What is the best correction?

Accepted Answer

The temperature decreased, so the data provides evidence that energy was taken in.

Answer

The temperature decreased, so no energy moved.

Answer

The temperature decreased, so the reaction must have created energy.

Answer

Temperature cannot be used as evidence of energy transfer.

Question 21

Which data provides the strongest evidence for an exothermic reaction?

Accepted Answer

19°C → 33°C

Answer

25°C → 24°C

Answer

28°C → 20°C

Answer

22°C → 17°C

Question 22

Which data provides the strongest evidence for an endothermic reaction?

Accepted Answer

30°C → 18°C

Answer

20°C → 22°C

Answer

21°C → 29°C

Answer

24°C → 31°C

Question 23

Four groups test different reactions. Which group collected evidence that its reaction took in the greatest amount of thermal energy, based only on temperature change?

Accepted Answer

Group D: 30°C → 17°C

Answer

Group A: 20°C → 25°C

Answer

Group B: 26°C → 23°C

Answer

Group C: 19°C → 27°C

Question 24

A reaction changes from 23°C to 35°C. Which student explanation uses the evidence correctly?

Accepted Answer

The reaction released energy because the temperature increased from 23°C to 35°C.

Answer

The reaction took in energy because the temperature increased.

Answer

The reaction was endothermic because it became warmer.

Answer

No energy was transferred because the atoms were conserved.

Question 25

A reaction changes from 32°C to 24°C. Which student explanation uses the evidence correctly?

Accepted Answer

The reaction took in energy because the temperature decreased from 32°C to 24°C.

Answer

The reaction released energy because the temperature decreased.

Answer

The reaction was exothermic because it became cooler.

Answer

No energy was transferred because the temperature changed.

Question 26

A student wants to compare two reactions to determine which one releases more thermal energy. Which data would be most useful?

Accepted Answer

The temperature before and after each reaction

Answer

The color of each container

Answer

The number of letters in each substance's name

Answer

The shape of the lab table

Question 27

Reaction A changes from 21°C to 28°C. Reaction B changes from 20°C to 32°C. What can be concluded from the temperature data?

Accepted Answer

Both released energy, and Reaction B had the larger temperature increase.

Answer

Both took in energy, and Reaction A had the larger change.

Answer

Reaction A was endothermic and Reaction B was exothermic.

Answer

Reaction B took in more energy than Reaction A.

Question 28

A student observes a temperature increase during a chemical reaction. Which chain of reasoning is correct?

Accepted Answer

Temperature increased → energy released → exothermic

Answer

Temperature increased → energy taken in → endothermic

Answer

Temperature increased → no energy transfer → physical change

Answer

Temperature increased → atoms destroyed → exothermic

Question 29

A student observes a temperature decrease during a chemical reaction. Which chain of reasoning is correct?

Accepted Answer

Temperature decreased → energy taken in → endothermic

Answer

Temperature decreased → energy released → exothermic

Answer

Temperature decreased → no energy transfer → endothermic

Answer

Temperature decreased → atoms created → exothermic

Question 30

Which statement best connects chemical reactions, conservation of matter, and energy transfer?

Accepted Answer

Atoms can rearrange to form new substances while matter is conserved, and energy can be released or taken in.

Answer

Atoms disappear when energy is released.

Answer

New atoms form whenever temperature changes.

Answer

Matter is conserved only in reactions that do not transfer energy.

BLASTROOM

BLASTROOM

Matter Review 2

Ways to Play

Device Games: Students play on their phones

BLASTROOM

BLASTROOM

Matter Review 2

Ways to Play

Device Games: Students play on their phones

Blast Go

Zombie Escape

Avalanche

Maze Blast

Cave Climb

Blast Out

Mystery Auction

Tour Guide

Food Truck Rush

Tug of War

Bug Blast

Alien Blast

Glacier Rush

BlastRace

BlastQuiz

Board Games: Teacher-led, projected to the class

BlastBoard

Seek & Destroy

Texas Hold 'Em

Hot Potato

Market Mayhem

Bank Heist

Top Corner

Like what you see?

Mystery Blast

Checkers

Da Bomb

Castle Siege

King of the Hill

Matter Review 2

Ways to Play

Device Games: Students play on their phones

Matter Review 2

Ways to Play

Device Games: Students play on their phones

Blast Go

Zombie Escape

Avalanche

Maze Blast

Cave Climb

Blast Out

Mystery Auction

Tour Guide

Food Truck Rush

Tug of War

Bug Blast

Alien Blast

Glacier Rush

BlastRace

BlastQuiz

Board Games: Teacher-led, projected to the class

BlastBoard

Seek & Destroy

Texas Hold 'Em

Hot Potato

Market Mayhem

Bank Heist

Top Corner

Like what you see?

More like this

Mystery Blast

Checkers

Da Bomb

Castle Siege

King of the Hill