tests for ions ( paper 2 )

Question 1

sodium colour in a flame test

Answer 1

yellowe

Question 2

lithium colour in flame test?

Answer 2

red

Question 3

calcium colour in a flame test

Answer 3

orange-red

Question 4

potassium flame test colour

Answer 4

lilac

Question 5

copper flame test colour

Answer 5

blue green

Question 6

what colour does iron II turn in hydroxide precipitate tests

Answer 6

green

Question 7

what colour does iron III turn hydroxide precipitate tests

Answer 7

brown

Question 8

what colour does copper turn in hydroxide precipitate tests

Answer 8

blue

Question 9

what colour does calcium turn in hydroxide precipitate tests

Answer 9

white

Question 10

what colour does aluminium turn in hydroxide precipitate tests

Answer 10

white

Question 11

what elements precipitate turns clear when excess sodium hydroxide is added

Answer 11

aluminium

Question 12

what is the test for ammonia and how is the gas detected

Answer 12

.add dilute sodium hydroxide and then warm on a Bunsen
.place damp red litmus paper over the test sample, turns blue if ammonia is present (as it is an alkaline)

Question 13

how do you test for carbonate ions

Answer 13

adding dilute hydrochloric acid
look for bubbles
bubble through lime water, if it turns cloudy carbon dioxide gas is present

Question 14

what is used to test for sulfate ions

Answer 14

dilute hydrochloric acid and barium chloride

Question 15

what will happen in the test if SO4 ions are present

Answer 15

a white precipitate will form

Question 16

what colour will a chloride compound turn if dilute nitric acid and silver nitrate is added to it

Answer 16

white

Question 17

what colour will a compound containing bromine turn if dilute nitric acid and silver nitrate is added to it

Answer 17

cream

Question 18

what colour will a iodide compound turn if dilute nitric acid and silver nitrate is added to it

Answer 18

yellow

Question 19

what is the test for oxygen

Answer 19

a glowing splint will relight

Question 20

what is the tests for ammonia ions

Answer 20

damp red litmus paper will turn blue ( ammonia is an alkaline so indicator will go blue)

Question 21

what is used to test for carbonate (anions)

Answer 21

dilute hydrochloric acid

Question 22

what is the test for presence carbonate ions

Answer 22

.adding hydrochloric acid to the test solution
.look for bubbles to be formed as this means gas is produced
.test the gas by bubbling it through lime water, if it goes cloudy carbon dioxide is present

Question 23

what two substances are used when testing for sulfate ions

Answer 23

dilute HCL and barium chloride

Question 24

what happens when sulfate ions are present after adding dilute HCL and barium chloride

Answer 24

a white precipitate is formed

Question 25

uses of nanoparticles

Answer 25

-used to almost invisible sunscreen as it absorbs harmful ultra violet radiation in sunlight preventing skin cancer