Island survival

Question 1

What kind of heat transfer occurs in fluids where particles are free to move?

Answer 1

Convection

Question 2

Explain where plants get their mass from.

Answer 2

The carbon and water they get in the air - through photosynthesis.

Question 3

Define mixture

Answer 3

A combination of two or more substances that are not chemically combined

Question 4

What is used to test for starch?

Answer 4

Iodine solution. If starch is present, it will turn from orange to blue/black.

Question 5

Produces solid crystal form a solution

Answer 5

Crystallisation

Question 6

What does putting a coat on a snowman do and why?

Answer 6

Slows down the speed at which it melts. The coat is a thermal insulator which reduces thermal energy transferring from the warmer air into the snowman.

Question 7

Why do cricketers wear white clothing on a sunny day?

Answer 7

To keep them cooler at the white clothing absorbs less raadiation from the sun compared to darker clothing.

Question 8

What is the name given to liquid that is collected after passing through filter paper?

Answer 8

Flitrate

Question 9

What is the name for a solution with the maximum amount of solute dissolved inside?

Answer 9

Saturated solution

Question 10

What kind of surface is most likely to absorb radiation?

Answer 10

Dark and matt. In opposition to this, a surface that is likely to reflect radiation is something shiny, like a mirror.

Question 11

What process involves heating water up, condensing the vapour back into liquid to seperate the solution?

Answer 11

Distillation

Question 12

What technique could be used to abtain clean drinking warter from a salt water solution?

Answer 12

Distillation

Question 13

A substance that has dissolved in a solvent

Answer 13

Solute

Question 14

Technique that seperates insoluble solds from a mixture

Answer 14

Filtration

Question 15

Heat transferred due to particle to particle collisions?

Answer 15

Convection

Question 16

When you are studying a system, what is meant by the surroundings?

Answer 16

Everything that surrounds the system and could potentially interact with the system.

Question 17

A mixture not uniform in composition

Answer 17

Heterogeneous mixture

Question 18

A mixture uniform in composition

Answer 18

Homogenous mixture

Question 19

Air is a mixture of gases; sea water is a mixture of water and salt. Are these examples of homogenous or heterogenous mixtures?

Answer 19

Homogenous

Question 20

What is the name given to the material left behind in the filter paper after filtration?

Answer 20

Residue

Question 21

Heat energy transfers due to waves by what method?

Answer 21

Radiation

Question 22

What reactants are needed for photosynthesis?

Answer 22

Light energy converts carbon dioxide and water (the reactants) into glucose and oxygen (the products).

Question 23

Photosynthesis is the function of…

Answer 23

Plants converting light energy from the sun into chemical energy for food.

Question 24

Word equation for photosynthesis

Answer 24

Carbon dioxide + water -> glucose + oxygen

Question 25

Define element

Answer 25

A substance made of only one type of atom (A pure substance)

Question 26

Define compound

Answer 26

A substance consisting of two or more elements that are chemically combined.

Question 27

Define filtrate

Answer 27

Liquid that has passed through a filter

Question 28

Define residue

Answer 28

The undissolved solid after filtering.

Question 29

What is the name of the green pigment in leaves plants need to photosynthesise

Answer 29

Chlorophyll

Question 30

Glucose is stored by plants as what substance?

Answer 30

Starch

Question 31

How does distillation work?

Answer 31

As liquids have different boiling points

Question 32

Filtration is able to separate things because…

Answer 32

Of different particle size.

Question 33

What is photosynthesis?

Answer 33

The process by which green plants containing chlorophyll use light to make sugars from carbon dioxide and water and that oxygen is produced as a by-product.