Quiz about Compounds and Chemical Reactions

Question 1

Which of the following is a sign that a chemical reaction has occurred?

Accepted Answer

formation of a gas

Answer

change in shape

Answer

melting

Answer

dissolving

Question 2

Which row shown represents compounds?

Accepted Answer

Bottom row

Answer

Top row

Question 3

Which choice would be a molecule?

Accepted Answer

H2

Answer

O

Answer

H

Answer

Au

Question 4

Which of the following is a chemical change?

Accepted Answer

A rusted can

Answer

A crushed can

Answer

A chopped piece of wood

Answer

Water evaporating

Question 5

How many atoms of Hydrogen are in this compound?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 6

This picture represents which of the following?

Accepted Answer

compound

Answer

element

Question 7

What is the molecular structure of table salt?

Accepted Answer

NaCl

Answer

Sandwich

Answer

Molecular who?

Answer

H2O

Question 8

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

Accepted Answer

Chemical Change

Answer

Physical Change

Question 9

How many different elements are in this chemical formula: C₂H₂ClK₃

Accepted Answer

4

Answer

6

Answer

8

Answer

2

Question 10

Which of the following is a pure substance?

Accepted Answer

O2

Answer

Al2CO5

Answer

C₆H₁₂O₆

Answer

SiO2

Question 11

Is wood burning a physical or chemical change?

Accepted Answer

Chemical

Answer

Physical

Question 12

Is milk going sour a physical or chemical change?

Accepted Answer

Chemical

Answer

Physical

Question 13

Is copper tarnishing a physical or chemical change?

Accepted Answer

Chemical

Answer

Physical

Question 14

Is mold growing on cheese a physical or chemical change?

Accepted Answer

Chemical

Answer

Physical

Question 15

Which observation(s) might be used as evidence that a chemical reaction occurred?

Accepted Answer

All of the above

Answer

Color change

Answer

Odor change

Answer

Properties change

Question 16

CH₂Cu₈ - How many Copper atoms are in this formula?

Accepted Answer

8

Answer

1

Answer

2

Answer

16

Question 17

This tells you how many atoms of an element you have in a chemical formula

Accepted Answer

subscript

Answer

coefficient

Answer

chemical symbol

Answer

atomic number

Question 18

Most atoms join with different types of atoms in a process called a chemical change or a chemical

Accepted Answer

reaction

Answer

compound

Answer

molecule

Question 19

What kind of molecule is produced as a result of a chemical change?

Accepted Answer

compound

Answer

diatomic molecule

Answer

chemical reaction

Question 20

Salt is an example of a

Accepted Answer

compound

Answer

diatomic molecule

Answer

molecule

Question 21

Which of the following is a result of a chemical reaction?

Accepted Answer

C) A change in color

Answer

A) A change in temperature

Answer

B) A change in state

Answer

D) A change in size

Question 22

What is the product of the chemical reaction: $$\ce{2H2 + O2 -> 2H2O}$$ ?

Accepted Answer

C) Water

Answer

A) Hydrogen gas

Answer

B) Oxygen gas

Answer

D) Hydrogen peroxide

Question 23

Which of the following represents a compound?

Accepted Answer

B) $$H_2O$$

Answer

A) $$O_2$$

Answer

C) $$N_2$$

Answer

D) $$He$$

Question 24

In a chemical reaction, what does the arrow (->) signify?

Accepted Answer

A) The direction of the reaction

Answer

B) The equality of reactants and products

Answer

C) The presence of a catalyst

Answer

D) The temperature change

Question 25

Which of the following is an example of a chemical reaction?

Accepted Answer

C) Iron rusting

Answer

A) Ice melting

Answer

B) Salt dissolving in water

Answer

D) Sugar mixing with tea

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