Harder

Question 1

Newtons 1st law

Answer 1

A
An object will not change its motion unless a force acts on it.
eg
something that isnt moveing wont move unless a force acts on it
something that is moving will stay moving unless a force acts on it

Question 2

Newtons 2nd law

Answer 2

Force = Mass x acceleration

Question 3

Newtons 3rd law

Answer 3

For every action there is an opposite reaction

Question 4

How to calculate accelration

Answer 4

A
change in velocity/ time
eg 0-60 kph in 3 seconds
(60-0) /3 = 20kph faster per second

Question 5

how to calculator velocity

Answer 5

V = distance/time

Question 6

balanced forces means the object will ___

Answer 6

constant speed if its moving
not move if its not moving

Question 7

Downwards force

Answer 7

Gravity

Question 8

how does resistor work

Answer 8

slows down electrons by putting obstacles in the way which converts the lost energy into heat energy

Question 9

series circuit current/amps is the ___

Answer 9

Same through whole ciruit

Question 10

Voltage in parrallel circuit is the __

Answer 10

is the same at each bulb

Question 11

Ohms law

Answer 11

R= V÷I
Resistance
Voltage
I= Current (A)

Question 12

List all types of energy

Answer 12

Electrical
Kinetic
Sound
Light
Heat
Gravitational Potential
Chemical Potential
Elastic Potential
Nuclear

Question 13

How was coal formed?

Answer 13

Plants and animals who died in swamps over millions of years got covered by layers of dirt and rock. The resulting pressure and heat turned the plants into coal.

Question 14

How was natural gas and oil formed?

Answer 14

Plants and animals who died in the sea over millions of years got covered by layers of dirt and rock. The resulting pressure and heat turned the plants into natural gas and oil.
Natural gas is same as oil formation but more pressure and heat.

Question 15

Why is carbon used for fuels and energy?

Answer 15

They burn with a clean flame and no smoke is produced.
Carbon and their compounds give out a lot of heat, energy and light when they are burnt in air
Carbon compounds have higher maximum ignition temperatures and their combustion can be restrained.

Question 16

Atomic number

Answer 16

Number of electrons/protons

Question 17

Atomic mass

Answer 17

Total number of protons and neutrons in the nucleus

Question 18

How to find number of neutrons

Answer 18

Mass Number – Atomic Number = Number of Neutrons

Question 19

What happens when you burn a non-metal?

Answer 19

Fuel -> Non Metal + oxygen -> Carbon Dioxide + Water

Question 20

Ocean acidification

Answer 20

CO₂ + H₂O -> H₂CO₃ (carbonic acid)
Ocean acidification is the reduction in the pH of the ocean over an extended period of time, caused by more carbon dioxide (CO2) from the atmosphere.

Question 21

Crystalization

Answer 21

Used to obtain pure crystals of a substance from an impure mixture.

Solid is disolved in an solvent
Mixture is heated to evaporate solvent
Solution is allowed to cool and solid appears as crystals

Question 22

3 Sustainable fishing methods

Answer 22

Traps, Harpoons, Hook

Question 23

How are microplastics made?

Answer 23

Weathering, through exposure to, for example, wave action, wind abrasion, and ultraviolet radiation from sunlight.

Question 24

What plastic cant be recycled?

Answer 24

Thermosetting plastics

Question 25

What plastic can be recycled?

Answer 25

Thermoplastics

Question 26

How is plastic made?

Answer 26

Lots of small monomers combined by polymerization to create long chains of polymers.

Question 27

4 Spheres of the earth

Answer 27

Lithosphere (land), hydrosphere (water), biosphere (living things), and atmosphere (air)

Question 28

Red cabbage experiment

Answer 28

Red cabbage juice is purple
Neutral= purple
acid= Red
Base= Blue

Question 29

How does static electricity work

Answer 29

Balloon rubs hair
Balloon collects electrons on the hair
Hair repels because of same charge

Question 30

How is energy lost at each level

Answer 30

Energy is lost due to movement, respiration, heat loss in penguin etc.

Question 31

Coal and oil produce carbon dioxide and sulphur dioxide when they burn. What elements must they contain?

Answer 31

Carbon and sulfur