TOPIC 7 - Kitchen Cupboard Chemicals

Question 1

Balanced chemical equation for the complete combustion of glucose

Answer 1

C₆H₁₂O₆ + 6O₂ -> 6CO₂ + 6H₂O

glucose + oxygen -> carbon dioxide + water

Question 2

when glucose burns it produces

Answer 2

carbon dioxide and water

Question 3

glucose and sucrose when reacted with benedict’s reagent

Answer 3

glucose: blue to red
sucrose: stays blue (no change)

Question 4

what kind of sugar is glucose

Answer 4

monosaccharide

Question 5

what kind of sugar is sucrose

Answer 5

disaccharide

Question 6

chemical formula for glucose

Answer 6

C₆H₁₂O₆

glucose

Question 7

chemical formula for sucrose

Answer 7

C₁₂H₂₂O₁₁

sucrose

Question 8

plants make glucose through

Answer 8

photosynthesis

Question 9

what is a condensation reaction

Answer 9

tgtyyyt

Question 10

what is hydrolysis

Answer 10

gddfgdf

Question 11

conversion of glucose into sucrose is done by

Answer 11

condensation

Question 12

sucrose breaking down into glucose is done by

Answer 12

hydrolysis

Question 13

Balanced chemical equation for the fermentation of glucose

Answer 13

C₆H₁₂O₆ -> 2CO₂ + 2C₂H₅OH

glucose -> carbon dioxide + ethanol

Question 14

Conditions for fermentation to take place

Answer 14

warm conditions but not above 50*C otherwise the enzymes will denature.

Question 15

Distillation is used to achieve ?

Answer 15

an alcohol percentage greater than 15%

Question 16

hydroxyl group

Answer 16

(-OH)

Question 17

if the alcohol is a straight chain alkane with a hydroxyl group then it is a member of which homologous series?

Answer 17

the alkanol homologous series.

Question 18

general formula of alcohols

Answer 18

CₙH₂ₙ₊₁OH

Question 19

most common alcohol

Answer 19

ethanol

Question 20

carboxyl group

Answer 20

(-COOH)

Question 21

all carboxylic acids contain the

Answer 21

carboxyl group

Question 22

if the alcohol is a straight chain hydrocarbon with the carboxyl group then it is known as

Answer 22

an alkanoic acid.

Question 23

general formula of carboxylic acids

Answer 23

CₙH₂ₙ₊₁COOH

Question 24

ethanoic acid is also known as

Answer 24

vinegar

Question 25

propanoic acid is also known as

Answer 25

lactic acid

Question 26

uses of carboxylic acids

Answer 26

cleaning, additives, preservatives.

Question 27

morphine is a drug that is extracted from

Answer 27

poppies

Question 28

isomers have

Answer 28

same molecular formula but different structural formula.

Question 29

homologous series has

Answer 29

same general formula and similar chemical properties

Question 30

carbohydrates are compounds which contain

Answer 30

carbon, hydrogen and oxygen with the hydrogen and oxygen ratio of 2:1

Question 31

starch is a polymer made up of

Answer 31

1000s of glucose molecules joined together

Question 32

starch reaction with iodine solution

Answer 32

brown to blue/black

Question 33

as alcohols and carboxylic acids increase in size

Answer 33

their melting and boiling points increase due to increasing strength of intermolecular forces between molecules

Question 34

alcohols are effective

Answer 34

solvents and they are highly flammable and burn with clean flames.