3.4 Atmosphere and Acids

Question 1

How much of the earths dry air contains Nitrogen, Oxygen, Argon and Carbon Dioxide?

Answer 1

N – 78%
O – 21%
Ar – 0.9%
CO2 – 0.04%

Question 2

Define an indicator?

Answer 2

Liquid that changes colour in different pH levels

Question 3

What colours will methyl orange change in: Acid, Alkali; Neutral?

Answer 3

Red, Yellow, Yellow

Question 4

What colours will Phenolphthalein change in: Acid, Alkali; Neutral?

Answer 4

Colourless, Colourless, Pink

Question 5

What colours will Red Litmus change in: Acid, Alkali; Neutral?

Answer 5

Red, Red, Blue

Question 6

What colours will Blue Litmus change in: Acid, Alkali; Neutral?

Answer 6

Red, Blue, Blue

Question 7

Name 2 alkalis?

Answer 7

Sodium hydroxide
Potassium hydroxide

Question 8

Name 2 acids?

Answer 8

Any Metal Oxide (Magnesium oxide)

Question 9

Define an acid?

Answer 9

Gives H+ ions off

Question 10

Define Base?

Answer 10

Will accept the H+ donated by acids

Question 11

Define Alkali?

Answer 11

Will donate OH- ions when dissolved in water

Question 12

Give the Formula for hydroxide?

Answer 12

OH-

Question 13

Give the Formula for Nitrate?

Answer 13

NO -
3

Question 14

Give the Formula for carbonate?

Answer 14

CO 2-
3

Question 15

Give the Formula for sulphate?

Answer 15

SO 2-
4

Question 16

Give the Formula for ammonium?

Answer 16

NH +
4

Question 17

Give the Formula for phosphate?

Answer 17

Po
4

Question 18

Give the Formula for sulfuric acid?

Answer 18

H SO
2 4

Question 19

Give the Formula for hydrochloric acid?

Answer 19

HCL

Question 20

Give the Formula for nitric acid?

Answer 20

HNO
3

Question 21

Give the Formula for phosphoric acid?

Answer 21

H PO
3 4

Question 22

What does an acid and a carbonate make?

Answer 22

Salt + water + CO2

Question 23

What does an acid and metal oxide make?

Answer 23

Salt + water

Question 24

What does an acid and metal hydroxide make?

Answer 24

Salt + Water

Question 25

What does an acid and Ammonia make?

Answer 25

Ammonium salt

Question 26

What does an acid and a metal make?

Answer 26

Salt + Hydrogen

Question 27

What causes things to become insoluble

Answer 27

Oxides, Hydroxides, Carbonates, Lead, Barium and Calcium Sulfates Silver & Lead Halides

Question 28

What causes things to become soluble

Answer 28

All of grp 1 All nitrates Most halides Most sulphates

Question 29

What causes things to become insoluble

Answer 29

Oxides, Hydroxides, Carbonates, Lead, Barium and Calcium Sulphates Silver & Lead Halides

Question 30

Explain how you find a gas product?

Answer 30

Light a splint and put into gas, if makes a squeaky pop sound = Hydrogen

Question 31

Give 2 observations you'd make from Mg metal reacting with sulphuric acid?

Answer 31

A gas is produced and metal disappears

Question 32

Name the first step of the copper sulphate practical?

Answer 32

Measure out 40 cm3 of sulfuric acid into a 100 cm3 beaker

Question 33

Name the second step of the copper sulphate practical?

Answer 33

Weigh out roughly 4 g of copper oxide in a weighing boat.

Question 34

Name the third step of the copper sulphate practical?

Answer 34

Gently heat the acid for 2 minutes

Question 35

Name the fourth step of the copper sulphate practical?

Answer 35

Add the copper oxide to the sulphuric acid, stir with a glass rod. Add the copper oxide until no more will disappear

Question 36

Name the fifth step of the copper sulphate practical?

Answer 36

Wait 5 minutes for the mixture to cool.

Question 37

Name the sixth step of the copper sulphate practical?

Answer 37

Filter the mixture into an evaporating basin.

Question 38

Name the seventh step of the copper sulphate practical?

Answer 38

Heat the filtrate with a bunsan burner until crystals start forming at the edges

Question 39

Name the eighth step of the copper sulphate practical?

Answer 39

Leave to cool for 5 minutes, then place into the tray

Question 40

Name the ninth step of the copper sulphate practical?

Answer 40

Leave crystals to full form over a few days

Question 41

Give the formula of the percentage of O2 in air practical?

Answer 41

% of Air that is O2 = Vol of air/ volume of air before rusting x 100

Question 42

What can change the results to be less in the percentage of O2 in air practical?

Answer 42

The reaction may not have been completed

Question 43

What can change the results to be higher in the percentage of O2 air practical