Chemistry EOY

Question 1

What does a chemical formulae tell us?

Answer 1

Which elements are in a compound and how many atoms of each element there are

Question 2

What is an indicator?

Answer 2

A substance that changes colour in acid, alkaline or neutral solutions

Question 3

What will turn red in universal indicator?

Answer 3

Acids

Question 4

What will turn green in universal indicator?

Answer 4

Neutral substances

Question 5

What will turn blue/purple in universal indicator?

Answer 5

Alkalis

Question 6

Give an example of a weak acid

Answer 6

Vinegar

Question 7

Give an example of a weak alkali

Answer 7

Toothpaste

Question 8

Give an example of a strong acid

Answer 8

Hydrochloric acid

Question 9

Give an example of a strong alkali

Answer 9

Oven cleaner

Question 10

Give an example of a neutral substance

Answer 10

Water

Question 11

What are acids on the pH scale?

Answer 11

0-6

Question 12

What are alkalis on the pH scale?

Answer 12

8-14

Question 13

What is neutral on the pH scale?

Answer 13

7

Question 14

What occurs when an acid and an alkali mix?

Answer 14

A neutralisation reaction

Question 15

Are all bases alkalis?

Answer 15

No. Alkalis are soluble bases

Question 16

What is a base?

Answer 16

Something that neutralises an acid

Question 17

Is a neutralisation reaction exothermic or endothermic?

Answer 17

Endothermic

Question 18

What does exothermic mean?

Answer 18

Takes in heat- cools down

Question 19

What does endothermic mean?

Answer 19

Gives off heat- warms up

Question 20

Finish the word equation:
Acid + Alkali/Base —>

Answer 20

a salt + water

Question 21

Finish the word equation:
Sodium hydroxide + Nitric acid —>

Answer 21

Sodium nitrate + water

Question 22

What does concentrated mean?

Answer 22

Lots of acid/alkali particles

Question 23

What does dilute mean?

Answer 23

Not many acid/alkali particles

Question 24

What indicator shows acids, alkalis and neutral?

Answer 24

Universal indicator

Question 25

Finish the word equation: Metal + Oxygen --->

Answer 25

Metal oxide

Question 26

What is it called when a more reactive element takes the place of a less reactive element?

Answer 26

A displacement reaction

Question 27

Name three metals

Answer 27

Any metal. e.g. magnesium, tin, copper

Question 28

Name three metal compounds

Answer 28

Any metal compounds. e.g. Magnesium oxide, zinc nitrate, copper sulphate

Question 29

Why is it not necessary to react a metal to its own metal compound?

Answer 29

There will be no change as it cannot displace itself

Question 30

Why is copper used for water pipes?

Answer 30

It doesn't react with water

Question 31

Why is copper used in electrical wires?

Answer 31

It is flexible and can conduct electricity

Question 32

What are ores?

Answer 32

Ores are compound that contain metals combined with other elements

Question 33

Finish the word equation: Iron ore + carbon --->

Answer 33

Carbon dioxide + iron

Question 34

What are metal that are pure metal in the ground called?

Answer 34

Native state

Question 35

What is the process of removing a metal from it's ore called?

Answer 35

Smelting

Question 36

What element does smelting use in a displacement reaction?

Answer 36

Carbon

Question 37

What is a period (in chemistry)?

Answer 37

A row going across

Question 38

What is a group?

Answer 38

A column going down

Question 39

What is group 1 called?

Answer 39

Alkaline metals

Question 40

What is group 2 called?

Answer 40

Alkaline earth metals

Question 41

What is the bit in the middle called? (periodic table)

Answer 41

Transition metals

Question 42

What is group 7 called?

Answer 42

Halogens

Question 43

What is group 8/0 called?

Answer 43

Noble gases

Question 44

What might be similar about elements in the same group?

Answer 44

They have the same amount of electrons in the outer shell

Question 45

Which side of the periodic table are the metals on?

Answer 45

The left

Question 46

How do group 1 react with water? What are the products?

Answer 46

As the period gets higher, they become more rigorous. It creates hydrogen

Question 47

Name 3 possible observations during any chemical reaction

Answer 47

1. A change in colour 2. A change in temperature 3. Something is made

Question 48

Where are halogens more reactive?

Answer 48

At the top

Question 49

Are halogens metals or non-metals?

Answer 49

Non-metals

Question 50

What percentage of the air is nitrogen?

Answer 50

78%