Unit 2

Question 1

a pure substance made from a single type of atom

Answer 1

element

Question 2

a group of two or more atoms held together by chemical bonds

Answer 2

molecule

Question 3

a substance in which the atoms of two or more elements are bonded together

Answer 3

compound

Question 4

Name of element
H

Answer 4

hydrogen

Question 5

Name of element
HE

Answer 5

helium

Question 6

Name of element
Li

Answer 6

lithium

Question 7

Name of element
Be

Answer 7

beryllium

Question 8

Name of element
B

Answer 8

boron

Question 9

Name of element
C

Answer 9

carbon

Question 10

Name of element
N

Answer 10

nitrogen

Question 11

Name of element
O

Answer 11

oxygen

Question 12

Which is a compound? A water molecule or an oxygen molecule

Answer 12

a water molecule

Question 13

True or False

Helium is an inert gas

Answer 13

true

Question 14

True or False

Hydrogen is a metal.

Answer 14

false

Question 15

True or False

Hydrogen is a flammable gas.

Answer 15

true

Question 16

New chemical compounds are formed in a chemical reaction.

Answer 16

true

Question 17

Name of element
F

Answer 17

fluorine

Question 18

Name of element
Ne

Answer 18

neon

Question 19

Name of element
Na

Answer 19

sodium

Question 20

Name of element
Mg

Answer 20

magnesium

Question 21

Name of element
Al

Answer 21

aluminium

Question 22

Name of element
Si

Answer 22

silicon

Question 23

Name of element
P

Answer 23

phosphoruous

Question 24

Name of element
S

Answer 24

sulphur

Question 25

*property of element* Metal that is resistant to corrosion a------------m

Answer 25

aluminum

Question 26

*property of element* black solid

Answer 26

carbon (boron is black/brown)

Question 27

*property of element* flammable metal m------

Answer 27

magnesium

Question 28

*True or false* All chemical reactions need heat to make them take place.

Answer 28

false

Question 29

*True or false* Heat can cause chemical reaction

Answer 29

true

Question 30

*True or false* Rusting is an example of a chemical reaction

Answer 30

false

Question 31

A substance that neutrolised an acid

Answer 31

base

Question 32

A substance produced by the **reaction between an acid and a metal or a base**.

Answer 32

salt

Question 33

A chemical that reacts with metals and bases to produce salts.

Answer 33

acid

Question 34

A substance that changes colour to show if a solution is acid or alkaline.

Answer 34

indicator (e.g. limus paper)

Question 35

A base that dissolves in water.

Answer 35

alkali

Question 36

**Acid or alkali** turns red limus blue

Answer 36

alkali

Question 37

**Acid or alkali** pH less than 7

Answer 37

acid

Question 37

**Acid or alkali** pH less than 7

Answer 37

acid

Question 38

**Acid or alkali** turns blue litmus red

Answer 38

acid

Question 39

**Acid or alkali** pH greater than 7

Answer 39

alkali

Question 40

**Use of acids and alkalis** magnesium hydroxide

Answer 40

treating indigestion

Question 41

**Use of acids and alkalis** sulphuric acid

Answer 41

electrolyte in **car batteries**

Question 42

**Use of acids and alkalis** nitric acid

Answer 42

making fertilisers

Question 43

**Use of acids and alkalis** sodium hydroxide

Answer 43

clearning and soap