Science

Question 1

Write the equation for aerobic respiration.

Answer 1

Glucose + Oxygen -> Carbon dioxide + Water.

Question 2

Write equation for anaerobic respiration.

Answer 2

Glucose -> Acid.

Question 3

Does the air we breathe in have more or less oxygen than the air we breathe out?

Answer 3

More.

Question 4

Does the air we breathe in have more or less carbon dioxide than the air we breathe out?

Answer 4

Less.

Question 5

What are the problems associated to the tar in cigarettes?

Answer 5

The tar can cause cancer.

Question 6

What are the problems associated to the nicotine in cigarettes?

Answer 6

Nicotine is addictive.

Question 7

What are the problems associated to the carbon monoxide in cigarettes?

Answer 7

The carbon monoxide can block the airways.

Question 8

If the bicep contracts, what does the tricep do?

Answer 8

The tricep retracts.

Question 9

What do red blood cells carry?

Answer 9

They carry Oxygen.

Question 10

What do vaccinations contain?

Answer 10

Vaccinations contain a dead or weakened version of the main virus.

Question 11

What do vaccinations cause white blood cells to produce?

Answer 11

They contain antibodies to neutralise the virus.

Question 12

What do some of these white blood cells then become to remember the infection?

Answer 12

They become memory cells.

Question 13

What is the difference between a chemical and a physical reaction?

Answer 13

A chemical reaction is irreversible and a physical reaction is reversible.

Question 14

Universal indicator will turn which colours in acid, alkali and neutral solutions?

Answer 14

Acid = Red
Neutral = Green
Alkali = Purple

Question 15

What are the pH’s of the strongest acid and the strongest alkali?

Answer 15

Strongest acid = pH 1

Strongest alkali = pH 14

Question 16

Why would you add an alkali to a pond after acid rain has fallen there?

Answer 16

The alkali would neutralise it and make it normal water again.

Question 17

Magnesium + oxygen →

Answer 17

Magnesium Oxide

Question 18

Magnesium + chlorine →

Answer 18

Magnesium Chloride

Question 19

What is the useful energy transferred in a light bulb?

Answer 19

The useful energy is light energy.

Question 20

What is the wasted energy transferred in a light bulb?

Answer 20

The waste energy is sound and heat energy.

Question 21

List the four energy transfers in a power station.

Answer 21

Chemical, Heat, Kinetic, Electric

Question 22

When a diver jumps off the high board, which force is pulling him downwards?

Answer 22

Gravitational Force.

Question 23

When a diver jumps off the high board, which force is pushing up against him?

Answer 23

Upthrust Force.

Question 24

Which two forces act in the opposite direction to the forward movement of a car on the road?

Answer 24

Friction and drag.