3.4 - Atmosphere and Acids

Question 1

Methyl Orange acidic colour

Answer 1

Red

Question 2

Methyl Orange neutral colour

Answer 2

yellow

Question 3

Methyl Orange alkaline colour

Answer 3

Yellow

Question 4

Phenolphthalein acidic colour

Answer 4

colourless

Question 5

Phenolphthalein neutral colour

Answer 5

colourless

Question 6

Phenolphthalein alkaline colour

Answer 6

Pink

Question 7

Red Litmus acidic colour

Answer 7

red

Question 8

Red Litmus neutral colour

Answer 8

red

Question 9

Red Litmus alkaline colour

Answer 9

blue

Question 10

Blue Litmus acidic colour

Answer 10

red

Question 11

Blue Litmus neutral colour

Answer 11

blue

Question 12

Blue Litmus alkaline colour

Answer 12

blue

Question 13

pH 0-2 colour

Answer 13

red

Question 14

pH 3-4 colour

Answer 14

orange

Question 15

pH 5-6 colour

Answer 15

yellow

Question 16

pH 7 colour

Answer 16

green

Question 17

pH 8-10 colour

Answer 17

light blue

Question 18

pH 11-13 colour

Answer 18

dark blue

Question 19

pH 14 colour

Answer 19

purple

Question 20

Percentage of nitrogen in air

Answer 20

78

Question 21

Percentage of oxygen in air

Answer 21

21

Question 22

Percentage of argon in air

Answer 22

0.96

Question 23

Percentage of carbon dioxide in air

Answer 23

0.04

Question 24

Equation for the percentage of oxygen in the air?

Answer 24

% O2 = initial vol - final vol / 100 x100

Question 25

Reasons that % of O2 wasn’t 21

Answer 25

• metal not heated for long enough
• leaky apparatus

Question 26

What is element combustion

Answer 26

Element combustion is when an element reacts with oxygen to produce an oxide.

Element + Oxygen → Element oxide

Question 26

What does a metal reacted with oxygen produce?

Answer 26

metal oxide

Question 26

What does a non-metal reacted with oxygen produce?

Answer 26

non-metal dioxide

Question 27

What are the three important combustions

Answer 27

1) 2Mg(s) + O2(g) → 2MgO(s)
2) S(s) + O2(g) → SO2(g)
3) 2H2(g) + O2(g) → 2H2O(l)

Question 28

Observation of the reaction between magnesium and oxygen?

Answer 28

• bright white light
• white powder formed

Question 29

Observation of the reaction between sulfur and oxygen?

Answer 29

blue flame

Question 30

Observation of the reaction between hydrogen and oxygen?

Answer 30

squeaky pop

Question 31

Charge on iron (II)

Answer 31

2+

Question 32

Charge on iron (III)

Answer 32

3+

Question 33

Charge on copper

Answer 33

2+

Question 34

Charge on silver

Answer 34

1+

Question 35

Charge on zinc

Answer 35

2+

Question 36

Charge on lead

Answer 36

2+

Question 37

What type of solution do metal oxides form?

Answer 37

Alkaline

Question 38

What type of solution do non- metal dioxides form?

Answer 38

acidic

Question 39

What steps could you take to find out whether an element was a metal or non-metal?

Answer 39

1. Combust it in oxygen
2. Dissolve the oxide formed
3. Check the pH of the solution with an indicator

Question 40

Definition of an acid

Answer 40

H+ donor

Question 41

Definition of an alkali

Answer 41

OH- donor

Question 42

Definition of a base

Answer 42

H+ acceptor

Question 43

What do have to do when multiplying polyatomic ions in chemical formulae?

Answer 43

USE BRACKETS

Question 44

acid + base equation

Answer 44

Acid + Base → Salt + Water

Question 45

Observation from an acid and base reaction?

Answer 45

The base disappears

Question 46

acid + carbonate equation

Answer 46

Acid + Carbonate → Salt + Water + Carbon dioxide

Question 47

Observations from acid and carbonate reaction?

Answer 47

• the carbonate disappears
• there is fizzing