3.1.1 - chemicals and observations

Question 1

formula for water

Answer 1

H2O

Question 2

formula for ammonia

Answer 2

NH3

Question 3

formula for hydrochloric acid

Answer 3

HCl

Question 4

formula for nitric acid

Answer 4

HNO3

Question 5

formula for sulphuric acid

Answer 5

H2SO4

Question 6

formula for methane

Answer 6

CH4

Question 7

formula for sodium hydroxide

Answer 7

NaOH

Question 8

formula for potassium hydroxide

Answer 8

KOH

Question 9

formula for ammonium hydroxide

Answer 9

NH4OH

Question 10

formula for carbon dioxide

Answer 10

CO2

Question 11

formula for carbon monoxide

Answer 11

CO

Question 12

formula for sulphur dioxide

Answer 12

SO2

Question 13

what are the diatomic elements

Answer 13

• bromine
• oxygen
• chlorine
• iodine
• hydrogen
• nitrogen
• fluorine

Question 14

what pH is acid when using universal indicator and what colours could it be?

Answer 14

1 - 6
weak acid (3-6) - YELLOW
strong acid (1-3) - RED

Question 15

what pH is neutral when using universal indicator and what colour would it be?

Answer 15

7
would be GREEN

Question 16

what pH is alkali when using universal indicator and what colours could it be?

Answer 16

8 - 14
weak alkali (8-11) - LIGHT BLUE
strong alkali (11-14) - DARK BLUE/PURPLE

Question 17

what colour would methyl orange turn in an acid?

Answer 17

red

Question 18

what colour would methyl orange turn in a neutral substance?

Answer 18

yellow

Question 19

what colour would methyl orange turn in an alkali?

Answer 19

yellow

Question 20

what colour would phenolphthalein turn in an acid?

Answer 20

colourless

Question 21

what colour would phenolphthalein turn in a neutral substance?

Answer 21

colourless

Question 22

what colour would phenolphthalein turn in an alkali?

Answer 22

pink

Question 23

what would happen if you added an acid to an alkali in methyl orange?

Answer 23

yellow -> orange

Question 24

what would happen if you added an alkali to an acid in methyl orange?

Answer 24

red -> orange

Question 25

what would happen if you added an acid to an alkali in phenolphthalein ?

Answer 25

pink -> colourless

Question 26

what would happen if you added an alkali to an acid in phenolphthalein ?

Answer 26

colourless -> pale pink

Question 27

what colour would red litmus turn in an acid?

Answer 27

red

Question 28

what colour would red litmus turn in a neutral solution?

Answer 28

stays red

Question 29

what colour would red litmus turn in an alkali?

Answer 29

blue

Question 30

what colour would blue litmus turn in an acid?

Answer 30

red

Question 31

what colour would blue litmus turn in a neutral substance?

Answer 31

stays blue

Question 32

what colour would blue litmus turn in an alkali?

Answer 32

blue