Acids

Question 1

methyl orange in an acid

Answer 1

red

Question 2

methyl orange in a neutral solution (such as distilled water)

Answer 2

yellow

Question 3

methyl orange in an alkali

Answer 3

yellow

Question 4

phenolphthalein in an acid

Answer 4

colourless

Question 5

phenolphthalein in a neutral solution (such as distilled water)

Answer 5

colourless

Question 6

phenolphthalein in an alkali

Answer 6

pink

Question 7

red litmus paper in an acid

Answer 7

red

Question 8

red litmus paper in a neutral solution (such as distilled water)

Answer 8

red

Question 9

red litmus paper in an alkali

Answer 9

blue

Question 10

blue litmus paper in an acid

Answer 10

red

Question 11

blue litmus paper in a neutral solution (such as distilled water)

Answer 11

blue

Question 12

blue litmus paper in an alkali

Answer 12

blue

Question 13

universal indicator in an acid

Answer 13

red

Question 14

universal indicator in a neutral solution (such as distilled water)

Answer 14

green

Question 15

universal indicator in an alkali

Answer 15

blue

Question 16

How do we measure pH?

Answer 16

using indicators or a pH meter

Question 17

pH 0-3 are

Answer 17

strong acids

Question 18

pH 4-6 are

Answer 18

weak acids

Question 19

pH 7 is

Answer 19

neutral

Question 20

pH 8-10 are

Answer 20

weak alkalis

Question 21

pH 11-14 are

Answer 21

strong alkalis

Question 22

What four main gases make up the air?

Answer 22

nitrogen-78%, oxygen-21%, argon-0.96%, carbon dioxide-0.04%

Question 23

Name Method 1 of determining the percentage of oxygen in the air

Answer 23

To place an upside down measuring cylinder into water which contains some damp ron wool at the top of it

Question 24

write a word equation for the reaction that takes place in the iron wool

Answer 24

iron + oxygen + water —> hydrated iron (III) oxide (rust)

Question 25

Fe3+ + Cl-

Answer 25

FeCl3

Question 26

Name method 2 of determining the percentage of oxygen in the air

Answer 26

Using a gas syringe and flask containing wet iron filings

Question 27

name method 3 of determining the percentage of oxygen in the air

Answer 27

Passing air through copper with plungers

Question 28

Silver (I)

Answer 28

Ag+

Question 29

Copper (II)

Answer 29

Cu2+

Question 30

Iron (II)

Answer 30

Fe2+

Question 31

Iron (III)

Answer 31

Fe3+

Question 32

Lead (II)

Answer 32

Pb2+

Question 33

Zinc (II)

Answer 33

Zn2+

Question 34

Nitrate

Answer 34

NO3 -

Question 35

Sulfate

Answer 35

SO4 2-

Question 36

Carbonate

Answer 36

CO3 2-

Question 37

Phosphate

Answer 37

PO4 3-

Question 38

Hydroxide

Answer 38

OH-

Question 39

Ammonium

Answer 39

NH4+

Question 40

Acid

Answer 40

H+ donor

Question 41

Base

Answer 41

H+ acceptor

Question 42

Alkali

Answer 42

OH- donor

Question 43

acid + metal —>

Answer 43

salt + hydrogen

Question 44

hydrochloric acid

Answer 44

HCl

Question 45

Sulphuric acid

Answer 45

H2SO4

Question 46

Nitric acid

Answer 46

HNO3

Question 47

Phosphoric acid

Answer 47

H3PO4

Question 48

acid + base —>

Answer 48

salt + water

Question 49

acid + carbonate —>

Answer 49

salt + water + carbon dioxide

Question 50

test for carbon dioxide

Answer 50

limewater turns cloudy

Question 51

test for oxygen

Answer 51

glowing splint relights

Question 52

test for hydrogen

Answer 52

squeaky pop

Question 53

sodium hydroxide

Answer 53

NaOH

Question 54

Potassium Hydroxide

Answer 54

KOH

Question 55

Ammonium hydroxide

Answer 55

NH4OH

Question 56

soluble elements

Answer 56

sodium potassium ammonium nitrate

Question 57

soluble (except with silver and lead)

Answer 57

chloride

Question 58

soluble (except with calcium, barium and lead)

Answer 58

sulfate

Question 59

insoluble (except with sodium, potassium and ammonium)

Answer 59

carbonate | oxide

Question 60

insoluble ( except with sodium, potassium and calcium)

Answer 60

hydroxide

Question 61

What kind of reaction occurs between an acid and an alkali?

Answer 61

Neutralisation