End of year exam

Question 1

In a periodic table, where are groups and periods

Answer 1

Groups are down and periods are across

Question 2

What is an element?

Answer 2

Pure substances that consist of only one type of atom

Question 3

What is a compound?

Answer 3

A pure substance made of 2 or more elements strongly joined together

Question 4

What is a mixture?

Answer 4

Two or more substances mixed together but not chemically joined.

Question 5

If a compound is made of 2 elements, what does its name end with?

Answer 5

ide

Question 6

If a compound is made of 3 elements and one is oxygen, what does it end with?

Answer 6

ate

Question 7

How do you find the % of oxygen in air?

Answer 7

Heat copper in air. It will form copper oxide. Measure the original volume of air, and then the final volume. The difference between them is the oxygen content.

Question 8

Name the gases in air and their percentages

Answer 8

Nitrogen: 78% Oxygen 21% Argon 0.94% Carabon dioxide 0.04%

Question 9

Name 3 examples of every day alkalis

Answer 9

Milk, washing up liquid, baking soda

Question 10

Name 3 examples of every day acids

Answer 10

Lemon juice, battery acid, limes

Question 11

What colour is universal indicator in acid, alkali and neutral

Answer 11

Red to yellow= acid
Green = Neutral
Blue to Purple = alkali

Question 12

What colour is methyl orange in acid and alkali?

Answer 12

Red in acid, Orange in alkali

Question 13

What colour is phenolphthalein in acid and alkali?

Answer 13

Colourless in acid, Pink in alkali

Question 14

What colour is red cabbage in acid and alkali?

Answer 14

Red in acid, green in alkali

Question 15

What colour is litmus in acid and alkali?

Answer 15

Red in acid, Blue in alkali

Question 16

What is the PH of a strong and weak acid?

Answer 16

1 and 6

Question 17

What is the pH of a weak and strong alkali

Answer 17

8 and 14

Question 18

Acid + Alkali =

Answer 18

Salt + Water

Question 19

Hydrochloric Acid + Sodium Hydroxide =

Answer 19

Sodium Chloride + Water

Question 20

Nitric Acid + Sodium Hydroxide =

Answer 20

Sodium Nitrate + Water

Question 21

Sulfuric Acid + Sodium Hydroxide =

Answer 21

Sodium Sulfate + Water

Question 22

Calcium Hydroxide + Hydrochloric acid =

Answer 22

Calcium Chloride + Water

Question 23

Iron Hydroxide + Sulfuric acid =

Answer 23

Iron Sulfate + Water

Question 24

Metal + Acid =

Answer 24

Salt + Hydrogen

Question 25

Magnesium + Hydrochloric acid

Answer 25

Magnesium chloride + Hydrogen

Question 26

Copper + Ntiric Acid =

Answer 26

Copper Nitrate + Hydrogen

Question 27

Metal Carbonate + Acid

Answer 27

Salt + Carbon dioxide + Water

Question 28

Sodium Carbonate + Hydrochloric Acid =

Answer 28

Sodium Chloride + Water + Carbon dioxide

Question 29

Give 2 every-day examples of neutralisation reactions

Answer 29

Indigestion tables are alkali used to treat stomach acid. Vinegar used to treat wasp stings

Question 30

What is a physical change?

Answer 30

One that can be reversed.

Question 31

What is a chemical reaction?

Answer 31

Chemical reactions make new chemicals. Atoms are rearranged during a chemical reaction, but the number of atoms does not change.

Question 32

How do you know a chemical reaction has taken place?

Answer 32

Fizzing due to gas being released, change in colour, give out heat or feel colder.

Question 33

What is thermal decomposition?

Answer 33

A compound breaks into simpler substances by heat

Question 34

What is combustion?

Answer 34

Burning in oxygen

Question 35

What is a precipitation reaction?

Answer 35

A chemical reaction forms a solid product

Question 36

What is an exothermic reaction?

Answer 36

A chemical reaction that releases heat and gets hotter

Question 37

In combustion, Fuel + Oxygen =

Answer 37

Carbon dioxide + Water

Question 38

What is the test for oxygen?

Answer 38

Lit splint glows brighter

Question 39

What is an endothermic reaction?

Answer 39

Gets cooler

Question 40

What is an oxidation reaction?

Answer 40

when a substance reacts and combines with oxygen e.g. Iron + oxygen = Iron Oxide

Question 41

What is a reduction reaction?

Answer 41

When oxygen is lost e.g. Copper oxide is reduced to copper when it reacts with magnesium to form magnesium oxide + copper