c12 chemical analysis

Question 1

what is purity in chemistry

Answer 1

made up of just one substance or just a single element of compound

Question 2

boiling points of pure substances are

Answer 2

always exact and never varying

Question 3

impurities such as salt do what to the melting and boiling point

Answer 3

lower the melting
raise the boiling

Question 4

what is a formulation

Answer 4

a mixture specifically designed to give a useful product

Question 5

test for hydrogen

Answer 5

two stacked test tubes

Question 6

observation of hydrogen

Answer 6

bubbles and squeaky pop

Question 7

test for oxygen

Answer 7

glowing splint held in test tube

Question 8

observation of oxygen

Answer 8

relight a glowing splint

Question 9

test for carbon dioxide

Answer 9

test t with lime water through delivery tube into dilute hcl + caco3

Question 10

observation of carbon dioxide

Answer 10

vigorous bubbling and milky white lime water

Question 11

test for chlorine

Answer 11

hcl into boiling tube with potassium manganate

Question 12

observation of chlorine

Answer 12

litmus paper bleached to colourless

Question 13

metal ions present in magnesium sulphate

Answer 13

mg

Question 14

metal ions present in calcium chloride

Answer 14

calcium

Question 15

metal ions present in aluminium sulfate

Answer 15

aluminium

Question 16

metal ions present in iron (ii) sulfate and iron (iii) chloride

Answer 16

iron

Question 17

metal ions present in copper (ii) sulfate

Answer 17

copper

Question 18

which sodium hydroxide test disolves in naoh

Answer 18

calcium chloride

Question 19

which sodium hydroxide test has white precipitate

Answer 19

magnesium sulfate, calcium chloride, aluminium sulfate

Question 20

what is the precipitate of iron (ii) sulfate

Answer 20

dirty green

Question 21

what is the precipitate of iron (iii’ chloride

Answer 21

orange brown