U2-3 - Everyday Consumer Products

Question 1

Carbohydrates

Answer 1

Compounds that contain only C, H and O.

The H and O have a 2:1 ratio.

Question 2

Formula for glucose

Answer 2

C₆H₁₂O₆

Question 3

Chemical test for glucose

Answer 3

Benedict’s solution turns from blue to brick red (when heated with glucose).

Question 4

Chemical test for starch

Answer 4

Iodine turns from brown to blue/black

Question 5

Starch is made up of many ________ units joined together.

Answer 5

glucose

Question 6

Why does starch need to be broken down (into glucose) during digestion?

Answer 6

So that it can pass through the gut wall.

(starch is too big but glucose can pass through)

Question 7

Starch + n H₂O ⟶ n glucose

What is this type of reaction called?

Answer 7

Hydrolysis

Question 8

Enzyme

Answer 8

Biological catalyst

Question 9

Name the enzyme used in the hydrolysis of starch

Answer 9

Amylase

Question 10

Hydrolysis

Answer 10

A type of reaction in which water is used to break up a molecule.

(e.g. the hydrolysis of starch to make glucose)

Question 11

How is glucose used in the body?

Answer 11

Used for respiration

Question 12

Name the process which makes alcohol from sugars

Answer 12

Fermentation

Question 13

Alcohol fond in alcoholic drinks

Answer 13

Ethanol

Question 14

Finish the word equation for fermentation

Answer 14

Question 15

Why is yeast necessary for fermentation?

Answer 15

Provides enzymes (zymase)

Question 16

Why can fermentation only produce low concentrations of alcohol?

Answer 16

Yeast dies past ~12-15% alcohol

Question 17

What can be done to increase alcohol concentration in alcoholic drinks?

Answer 17

Distillation

(or repeated distillation)

Question 18

One unit of alcohol in cm³

Answer 18

10 cm³

Question 19

Name a useful product which we can get from plants

Answer 19

Any of:

Medicines, food, alcohol, cosmetics, dyes

Question 20

Active compound

Answer 20

The compound in a medicine that is being used to treat a condition or illness.