Quiz about Chemical Reactions vs Physical Changes

Question 1

What happens in ALL chemical changes?

Accepted Answer

A new product is formed

Answer

Change in state of matter

Answer

Bubbles are produced

Answer

An explosion

Question 2

Is milk going sour a physical or chemical change?

Accepted Answer

Chemical

Answer

Physical

Question 3

Is making orange juice a physical or chemical change?

Accepted Answer

Physical

Answer

Chemical

Question 4

Is sharpening a pencil a physical or chemical change?

Accepted Answer

Physical

Answer

Chemical

Question 5

This image shows what happens when methane gas (CH₄) is burned (reacts with oxygen O₂). Which of the following is a reactant?

Accepted Answer

Methane (CH₄)

Answer

Water (H₂O)

Answer

Carbon dioxide (CO₂)

Answer

none of the above

Question 6

Is bending copper wire a physical or chemical change?

Accepted Answer

Physical

Answer

Chemical

Question 7

Hard-boiled eggs are the a result of a chemical change because

Accepted Answer

the eggs have different properties (smell, taste, color) before vs after.

Answer

the eggs are the same size before vs after.

Answer

the eggs weigh the same before vs after.

Answer

the eggs went through a phase change.

Question 8

Is melting butter a physical or chemical change?

Accepted Answer

Physical

Answer

Chemical

Question 9

Blending together ingredients into a smoothie is what kind of change?

Accepted Answer

physical change

Answer

chemical change

Answer

both types of changes

Answer

none of these

Question 10

Any time something burns, it is going through a

Accepted Answer

chemical change

Answer

physical change

Question 11

A mixture is the result of a physical change because...

Accepted Answer

The parts can be separated

Answer

A new substance is made

Answer

There is a chemical reaction

Answer

One part of the mixture disappears

Question 12

Which of these is true about a chemical change? (Choose all correct answers.)

Accepted Answer

The number of atoms in the reaction stays the same.

Accepted Answer

New materials are formed with different chemical properties.

Accepted Answer

Molecules are broken apart and/or new molecules are formed.

Answer

The reactants are the same as the products.

Question 13

A copper penny turning green after a few years is an example of ...

Accepted Answer

Chemical Change

Answer

Physical Change

Question 14

On a camping trip, Mr. Markowitz roasts a marshmallow in the campfire. He notices that the roasted marshmallow smells and tastes differently than the uncooked marshmallows. What change has taken place AND how does Mr. Markowitz know?

Accepted Answer

A chemical change because the marshmallow changed in taste, color, and smell

Answer

A chemical change because the marshmallow was heated up.

Answer

Only a physical change because the marshmallow changed in size

Answer

No change because the marshmallow is not a new substance

Question 15

The end results of a chemical reaction are called

Accepted Answer

products

Answer

reactants

Answer

explosion

Answer

a pile of goo

Question 16

The substances that go into a chemical reaction are called

Accepted Answer

reactants

Answer

products

Answer

molecules

Answer

mixtures

Question 17

What is a chemical change?

Accepted Answer

When molecules react with each other and form a new molecules

Answer

When you mix two substances

Answer

The change of physical properties

Answer

When a solid turns into a liquid

Question 18

This image shows what happens when methane gas (CH₄) is burned (reacts with oxygen O₂) to produce carbon dioxide and water. Which of the following is a product?

Accepted Answer

carbon dioxide (CO₂)

Answer

methane (CH₄)

Answer

oxygen (O₂)

Answer

none of the above

Question 19

Which of the following is a clue that a chemical change has occurred? (Choose all correct answers.)

Accepted Answer

Formation of a gas (bubbles)

Accepted Answer

Color change

Accepted Answer

Produces light or heat

Answer

Phase change

Question 20

This image shows what happens when methane gas (CH₄) is burned (reacts with oxygen O₂). This represents a chemical change because

Accepted Answer

the atoms have rearranged to form new molecules.

Answer

there is only one carbon atom.

Answer

the products and reactants are made of atoms and molecules.

Answer

there are the same number of atoms before and after.

Chemical Reactions vs Physical Changes

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