Science Test Chemistry

Question 1

What elements are in zinc hydroxide?

Answer 1

Zinc, hydrogen and oxygen

Question 2

What elements are in zinc carbonate?

Answer 2

Zinc, Carbon and Oxygen

Question 3

If a compounds name ends in “-ide”, what does this tell us?

Answer 3

That there are two elements in the compound.

Question 4

If a compounds name ends in “-ate”, what does this tell us?

Answer 4

That there are two elements plus oxygen.

Question 5

What elements are in iron sulfide?

Answer 5

Iron and Sulfur.

Question 6

What elements are in copper chlorate?

Answer 6

Copper, Chlorine and Oxygen.

Question 7

How do you identify a chemical change?

Answer 7

A new substance is made, fizzing, a colour change or a new chemical is produced.

Question 8

How do you identify a physical change?

Answer 8

If you can reverse what has happened.

Question 9

Give two examples of chemical changes

Answer 9

Baking a cake, fireworks going off

Question 10

Give 4 examples of physical changes

Answer 10

Boiling, melting, dissolving, condensing

Question 11

State 4 signs of a chemical reaction

Answer 11

Fizzing, colour change, new substance, new chemical produces

Question 12

If you see bubbles form
in a chemical reaction, what
does this tell you?

Answer 12

A new gas has been formed

Question 13

If you see cloudiness form in a chemical reaction, what does this tell you?

Answer 13

A solid has been made

Question 14

What is meant by the
words “reactant” and
“product”?

Answer 14

Reactant is the chemicals that have been reacted together and the product is the chemical that has been made

Question 15

What is a word
equation?

Answer 15

A summary of a chemical reaction

Question 16

1 example of a word
equation.

Answer 16

Hydrochloric+Sodium-sodium+H2O
Acid Hydroxide Chloride

Question 17

Name an indicator used
to find the pH of solutions.

Answer 17

Universal indicator

Question 18

Describe how to find the
pH of a solution (2 points)

Answer 18

Add universal indicator or pH paper

Question 19

What are the pH values
of neutral, acid and alkali?

Answer 19

Acid-pH 0-6. Neutral-pH7 Alkali-pH8-14

Question 20

What happens to how
acidic a solution is as the pH
decreases below 7?

Answer 20

It becomes more acidic the closer to pH 0 it gets

Question 21

What happens to how
alkaline a solution is as the
pH increases above 7?

Answer 21

It gets more alkaline the closer it gets to pH14

Question 22

What is a neutralisation
reaction?

Answer 22

When an acid and alkali mix until it is a pH 7

Question 23

Name the products of
neutralisation

Answer 23

A salt and water

Question 24

Write a word equation for neutralisation

Answer 24

Hydrochloricacid+sodiumhydroxide—sodiumchloride+water