acids bases and salts

Question 1

define acid

Answer 1

an acid is a substance which produces hydrogen ions, when it is dissolved water

Question 2

define alkali

Answer 2

an alkali is a substance which produces hydroxide ions, when it is dissolved in water

Question 3

physical properties of acids

Answer 3

1) taste sour
2) conduct electricity in aqueous state

Question 4

physical properties of alkalis

Answer 4

1) taste bitter
2) conduct electricity in aqueous state
3) feels soapy

Question 5

can acid and alkalis conduct electricity?

Answer 5

acid and alkalis can conduct electricity as the ions are able to move and carry electric current

Question 6

colour changes in universal indicator for acid

Answer 6

green to red

Question 7

colour changes in litmus paper for acid

Answer 7

blue to red

Question 8

colour changes for alkali in universal indicator

Answer 8

green to violet

Question 9

colour changes for alkali in litmus paper

Answer 9

red to blue

Question 10

acid + reactive metal (except copper, silver, gold) –> ?

Answer 10

salt + hydrogen gas (H2)

Question 11

acid + metal carbonate —-> ?

Answer 11

salt + water + CO2

Question 12

acid + metal oxide —-> ?

Answer 12

salt + water

Question 13

acid + alkali —> ?

Answer 13

salt + water

Question 14

ionic eqn for neutralisation

Answer 14

H+ (aq) + OH- (aq) —> H20 (L)

Question 15

alkali + ammonium salt —> ?

Answer 15

salt + water + ammonia gas (NH3)

Question 16

what is used to neutralise acidic soil?

Answer 16

calcium oxide or calcium hydroxide

Question 17

ph value and colour in universal indicator for hydrochloric, nitric and sulfuric acid

Answer 17

ph 1, red

Question 18

ph value and colour in universal indicator for ethanoic acid and CO2 in water

Answer 18

ph 3, orange

Question 19

ph value and colour in universal indicator for pure water

Answer 19

ph 7, green

Question 20

ph value and colour in universal indicator for aqueous ammonia

Answer 20

ph 12, blue

Question 21

ph value and colour in universal indicator for sodium/ potassium hydroxide

Answer 21

ph 14, purple

Question 22

test for sulfur dioxide gas

Answer 22

Bring a filter paper dipped in
acidified potassium manganate (VII)
the acidified potassium manganate
(VII) will turn from purple to
colourless

Question 23

test for chlorine gas

Answer 23

Bring a damp blue litmus near
the gas
Damp blue litmus will be bleached

Question 24

most metal oxides are?

Answer 24

basic oxides

Question 25

lead oxide, aluminium oxide and zinc oxides are what oxides?

Answer 25

amphoteric

Question 26

can amphoteric oxides react with only acid, only alkali or both?

Answer 26

amphoteric oxides can react with both acid and alkali

Question 27

can basic oxides react with only acid, only alkali or both?

Answer 27

basic oxides can only react with acid

Question 28

most non metal oxides are?

Answer 28

acidic oxides

Question 29

water, carbon monoxide and nitrogen monoxide are what kind of oxides?

Answer 29

neutral oxides

Question 30

can neutral oxides react with only acid, only alkali or both?

Answer 30

neutral oxides CANNOT react with acid or alkali

Question 31

can acidic oxides react with only acid, only alkali or both?

Answer 31

acidic oxides can only react with alkali

Question 32

are basic oxides insoluble or soluble in water?

Answer 32

most are insoluble in water. a few of them such as sodium oxide and calcium oxide can dissolve in water to form alkalis

Question 33

acidic oxides dissolves in water to form?

Answer 33

acid

Question 34

are neutral oxides soluble or insoluble in water?

Answer 34

insoluble in water

Question 35

which chlorides salts are insoluble in water?

Answer 35

lead (II) chloride and silver chloride

Question 36

which sulfate salts are insoluble in water?

Answer 36

barium sulfate, lead (II) sulfate and calcium sulfate

Question 37

which carbonate salts are soluble?

Answer 37

sodium carbonate, potassium carbonate, ammonium carbonate

Question 38

if the salt is insoluble, which method is used to prepare the salt?

Answer 38

precipitation

Question 39

if the salt is soluble, what methods are used to prepare the salt?

Answer 39

https://drive.google.com/file/d/1GoVgzn8XP5nAZdez3-U3-igBsvvkjOlC/view?usp=drivesdk