Questions

Question 1

What’s seven nutrients help the human body

Answer 1

Water, vitamins, carbs, protein, fibre, fats minerals

Question 2

What does fibre do for the body

Answer 2

Move food through the digestive system

Question 3

Products og magnesium + chloride

Answer 3

Magnesium chloride + hydrogen

Question 4

Product of 2na + cl*2

Answer 4

2NaCl

Question 5

Reactants of iron oxide

Answer 5

Iron + oxygen

Question 6

What is an alloy

Answer 6

A mixture of metals or a metal and another element 

Question 7

Examples of alloys

Answer 7

Brass and steel

Question 8

What is a compound?

Answer 8

A compound is a substance made of atoms of two or more elements chemically bonded

Question 9

What is oxygen?

Answer 9

An element

Question 10

What is salt?

Answer 10

A compound

Question 11

What is air?

Answer 11

A mixture

Question 12

What is the chemical reaction?

Answer 12

It is when a substance combines or breaks apart to new substances combustion

Question 13

What is acceleration

Answer 13

Is the change in speed or velocity of an object over a certain time

Question 14

Name a salt

Answer 14

Chloride

Question 15

Describe stationary

Answer 15

When an object is not moving or changing position , the forces are also usually balanced

Question 16

What does a constant speed mean

Answer 16

This is when an object moves at the same rate covering equal distance in equal time intervals

Question 17

Why is it unusual for ice to float in water mixed with food dye

Answer 17

It is unusual as in general solids are denser than liquids meaning their particles are closer together which means they will sink when put in water, but when water is frozen into ices it is less dense than water in ligquid form as when the particles freeze they lose energy and forms a hexagonal structure, because the water molecules are spaced further apart then they are as a liquid which decrease overall density of the ice and allows it to float on water

Question 18

Why does heating cause air pressure to increase in tyres

Answer 18

Becuase heated air molecules move faster as they gain energy and collide more frequently with the inner walls of the tyre which has a fixed volume so pressure cannot be released by volume but the pressure increases

Question 19

Equation for acceleration

Answer 19

Final speed - initial speed / time

Question 20

Equation from pressure

Answer 20

Force / area

Question 21

Namea strong acid

Answer 21

Hydrochloric acid

Question 22

Name a strong alkali

Answer 22

Sodium hydroxide

Question 23

Photosynthesis equation:

Answer 23

carbon dioxide + sunlight + water -> glucose + oxygen

Question 24

Aerobic respiration equation?

Answer 24

Glucose +oxygen -> carbon dioxide +water

Question 25

What do carbs do for the body

Answer 25

Provide a primary source of energy

Question 26

What are proteins used for in the body

Answer 26

Cell growth and repair

Question 27

What are lipids (fats) used for in the body

Answer 27

energy if carbs run out

Question 28

What are vitamins used for

Answer 28

Vital processes in the body

Question 29

What are minerals useful in the body?

Answer 29

Healthy calcium is used for strong teeth and bones Iron for healthy blood They do a variety of things to keep you healthy

Question 30

What is fibre used for in the body

Answer 30

Moving food through the digestive system

Question 31

What is water used for in the body

Answer 31

All chemical reaction

Question 32

Equation for moment

Answer 32

Force x distance

Question 33

What is the test that can be done to see of hydrogen is present

Answer 33

The test that can be done to see if hydrogen is present is the squeaky pop test which is when a lit splint is placed near the mouth of a test tube, if the gas is a present it will ignite with a loud squeaky pop, this happens because hydrogen will rapidly combust with oxygen creating the pop sound

Question 34

How do daffodils create glucose

Answer 34

Daffodils create glucose through photosynthesis which turns sunlight, water and carbon dioxide into glucose which is used for the plants growth and development

Question 35

How are ally’s different from compounds

Answer 35

Alloys are mixtures where elements are physically combined while compounds are chemically combined and form new substances

Question 36

What may species rely on each other for

Answer 36

Shelter, food , seed dispersal , pollination

Question 37

If an object can float in water it is known as what…

Answer 37

Buoyant and its weight will be less or equal to the upthrust of the water

Question 38

What is 1 kcal equal to in joules

Answer 38

4200J