Quiz about Chemical Change

Question 1

Carbon dioxide ( $$CO_2$$ ) forms when coal burns in the presence of oxygen. Which of these is the BEST evidence that a chemical reaction occurs when coal burns?

Accepted Answer

A new substance is produced

Answer

The shape of the coal changes

Answer

Oxygen is present

Answer

Coal is made up of more than one element

Question 2

Which of the following could indicate that a chemical change took place?

Accepted Answer

All are correct

Answer

Change in color

Answer

Production of Energy

Answer

Formation of Gas

Question 3

Which scientific observation, shown in the chart, indicates that a chemical reaction has NOT occurred?

Accepted Answer

Number 3

Answer

Number 1

Answer

Number 2

Answer

Number 4

Question 4

The formation of a solid when two liquids combine is called?

Accepted Answer

Precipitate

Answer

Solidification

Answer

Freezing

Answer

Solubility

Question 5

a rusting bicycle

Accepted Answer

chemical change

Answer

physical change

Question 6

corroding metal

Accepted Answer

chemical change

Answer

physical change

Question 7

fireworks exploding

Accepted Answer

chemical change

Answer

physical change

Question 8

frying an egg

Accepted Answer

chemical change

Answer

physical change

Question 9

A change where one or more new substances are created.

Accepted Answer

Chemical Change

Answer

Physical Change

Question 10

Fizzing, foaming, and burning are all examples of

Accepted Answer

Chemical change

Answer

Physical change

Question 11

Which of the following is a clear indication of a chemical change?

Accepted Answer

The formation of a new substance with different properties

Answer

A change in state from solid to liquid

Answer

A change in temperature without external heating

Answer

The melting of ice

Question 12

When vinegar is added to baking soda, a gas is produced. What type of change does this represent?

Accepted Answer

Chemical change

Answer

Physical change

Answer

No change

Answer

Phase change

Question 13

Which of the following processes is an example of a chemical change?

Accepted Answer

Rusting of iron

Answer

Boiling water

Answer

Melting of wax

Answer

Breaking a glass

Question 14

In a chemical reaction, the mass of the reactants is equal to the mass of the products. This is an example of which scientific law?

Accepted Answer

Law of Conservation of Mass

Answer

Law of Definite Proportions

Answer

Law of Multiple Proportions

Answer

Law of Conservation of Energy

Question 15

Which observation would most likely indicate that a chemical change has occurred during an experiment?

Accepted Answer

The substance changes color

Answer

The substance dissolves in water

Answer

The substance is cut into smaller pieces

Answer

The substance is heated and melts

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