Chapter 7 - Food Chemistry

Question 1

what is a mixture

Answer 1

a mixture is when 2 substances are not chemically combined together

Question 2

what are the seperating techniques

Answer 2

dissloving, filtration, evaporation, distillation & chromatography

Question 3

what is dissolving

Answer 3

dissolving is seperating solids by adding water into the mixture

Question 4

what is filtration

Answer 4

filtration is used to seperate an insoluble soild from a liquid

Question 5

what is the soild collected in the filter paper

Answer 5

residue

Question 6

what is the liquid collected in the beaker ( filtration )

Answer 6

filtrate

Question 7

what is evaporation

Answer 7

evaporation is used to seperate a dissolved solid from a liquid ( eg. salt water )

Question 8

what is distillation

Answer 8

it is used to seperate a liquid from a solution

Question 9

what is chromatography

Answer 9

it is used to seperate a mixture into it’s coloured components

Question 10

if the dye’s position is further up

Answer 10

it is more soluble

Question 11

if the dye’s position is at the lower point of the paper

Answer 11

it is less soluble

Question 12

what is chemical reaction

Answer 12

it happens around us. it must have a new product once the chemical reaction has happened

Question 13

examples of chemical reactions

Answer 13

rusting of nails, cooking of food, burning paper and food decay

Question 14

what is an acid

Answer 14

an acid gives off hydrogen and ion in an aqueas state.

Question 15

we can identify an acid by…

Answer 15

its sour taste , the color change in the universal indicator , the blur litmus paper turns red

Question 16

what is the pH value of lime water

Answer 16

4 ( acidic )

Question 17

what is the pH value of vinegar

Answer 17

3 ( acidic )

Question 18

what is the pH value of car battery

Answer 18

0 ( very acidic )

Question 19

what is the word equation for the reaction with acid and metal

Answer 19

acid + metal = salt + hydrogen gas

Question 20

what is the word equation for the reaction with acid and carbonate

Answer 20

acid + carbonate = salt + carbon dioxide + water

Question 21

if we do not have our regular meals, we will get gastric. what do we take in order for us to get better

Answer 21

antacids

Question 22

what is the word equation for neutralisation

Answer 22

acid + base = salt + water

Question 23

what is neutralisation

Answer 23

neutralisation is when an acid reacts with a base ( like antacids )

Question 24

examples of neutralisation

Answer 24

1. hair conditioner
2. fabric softener
3. tooth decay

Question 25

what are microbes

Answer 25

microbes are nature’s recyclers.

Question 26

how do microbes treat sewage water

Answer 26

the microbes produce enzymes and they use it to break the substances into smaller substances.