3.3.6 Organic Analysis

Question 1

what do we use to test for the presence of alkenes

Answer 1

bromine water

Question 2

what is the positive results for the test of alkenes using bromine water?

Answer 2

orange to colourless

Question 3

what do we use to test for the presence of alcohols?

Answer 3

acidifed potassium dichromate

Question 4

what is the colour change for thee positive results of primary and secondary alcohols

Answer 4

orange to green

Question 5

what is the colour change when tertiary alcohols are oxidisedd by acidified potassium dichromate

Answer 5

remains orange

Question 6

what reagent do we use to distinguish between primary and secondary alcohols

Answer 6

tollens reagent

Question 7

what is observed when we add tollens reagent to an aldehyde

Answer 7

silver mirror

Question 8

what is observed when we add tollens reagent to a ketone

Answer 8

no colour change

Question 9

what is observed when we add fehlings solution to an aldehyde

Answer 9

colour change from blue to red

Question 10

what is the percipitate formed from fehlings solution

Answer 10

red percipitate
which is copper oxide

Question 11

what is observed when we add fehlings solution to a ketone

Answer 11

stays blue

Question 12

what can we use to test for carboxylic acids

Answer 12

sodium hydrogen carbonate

Question 13

what is observed when we test for carboxylic acids

Answer 13

bubbles and fizzing

Question 14

what does the bubbles and fizzing represent when we test for carboxylic acids

Answer 14

the production of carbon dioxide

Question 15

how we can we test for carbon dioxide

Answer 15

lime water

Question 16

what happens when limewater when its used to test for carbon dioxide

Answer 16

turns milky

Question 17

what is meant by the term effervesence

Answer 17

bubble and fizzing