Science

Question 1

Where are chromosomes located?

Answer 1

In nucleus

Question 2

How many chromosomes does human body cell have

Answer 2

46

Question 3

How many chromosomes does a sperm cell have

Answer 3

23

Question 4

If 2 parents do not have cystic fibrosis what are the parents but have the allele

Answer 4

Carriers

Question 5

Is cystic fibrosis a dominant allele or recessive allele

Answer 5

Recessive allele

Question 6

A zebra fish have a gene transferred from a jellyfish.the gene allows the stripes of the zebra fish to change colour.Write 3 bullet points to describe how the scientists produced the genetically modified fish.

Answer 6

Gene taken from the jellyfish that has the desired characteristic
Gene is inserted into a bacterium and they replicate
They insert it into the fish in an early stage

Question 7

Why would scientists be worried about the genetically modified fish

Answer 7

Environmental impact
Can affect fish lifespan
Could affect population of normal zebra fish

Question 8

What particle has smallest mass

Answer 8

Electron

Question 9

Which particle has a negative charge

Answer 9

Electron

Question 10

What 2 particle in nucleus of boron there are

Answer 10

Proton and neutron

Question 11

In a boron element there is an equal number of

Answer 11

Neutrons and protons

Question 12

What are elements

Answer 12

Substances only made up of only 1 type of atom

Question 13

What are the states of matter

Answer 13

Melting
Boiling
Freezing
Condensing

Question 14

Name 1 use of a satellite

Answer 14

Satellite television,gps

Question 15

Which force keeps a satellite around the earth

Answer 15

Gravitational pull

Question 16

Give the name of the star in our solar system

Answer 16

Sun

Question 17

What is our galaxy

Answer 17

Milky way

Question 18

What is the life cycle of a star that becomes a black dwarf

Answer 18

Main sequence star-red giant-white dwarf-black dwarf

Question 19

Finish the sentence.
When scientists observe the light from distant galaxies,they observe an increase in the___________ of light from those galaxies

Answer 19

Wavelength

Question 20

How does big bang theory describe the beginning of the universe

Answer 20

Very dense and hot

Question 21

What can scientists not know about the universe

Answer 21

Why it was created

Question 22

Name renewable fuels

Answer 22

Solar,tidal,wind,bio fuels

Question 23

Name non renewable fuels

Answer 23

Oil,gas,coal

Question 24

Why does it mean that biofuels are carbon neutral

Answer 24

Biofuels are considered carbon neutral because the carbon dioxide they release when burned is roughly equal to the carbon dioxide plants absorb from the atmosphere while photosynthesis occurs

Question 25

How does a fossil fuel power station work

Answer 25

by burning fossil fuels, such as coal, oil, or natural gas, to produce heat. This heat is then used to boil water and create steam, which drives turbines connected to electric generators These generators convert the mechanical energy of the spinning turbines into electrical energy.

Question 26

compare fossil fuels and nuclear fuels in terms of energy provided, waste, and pollution.

Answer 26

Fossil fuels produce carbon emissions,harming the environment however nuclear energy Roduce small amounts of nuclear waste that is kept underground as it stays radioactive for a long time

Question 27

discuss some of the problems associated with biofuel use and production.

Answer 27

The production of biofuels causes emissions and green house gases to be emitted

Question 29

How does a wind turbine work

Answer 29

Wind turns a propeller blade which then turns a generator via cranks and gears,generating electricity

Question 30

How does a geothermal power plant work

Answer 30

They drill a well into the earth and extract hot steam,this steam powers a generator and energy is created,steam is then put back for later use

Question 31

Usually how much bigger is a black dwarf compared to the sun

Answer 31

0.9x bigger

Question 32

In which stage of the life cycle of a star are elements heavier than iron produced

Answer 32

Supernova

Question 33

Name the 3 satellite

Answer 33

Low earth orbit Geostationary orbit Medium earth orbit Polar orbit

Question 34

How do refracting telescope work

Answer 34

Light goes in and bounces of a mirror,it then goes through lens and provides your image

Question 35

What is the rate of reaction

Answer 35

The speed of which a reaction takes place

Question 36

Why when water os heated,a chemical reaction increases

Answer 36

Because the particles have more kinetic energy,thus more frequent collisions and a faster reaction

Question 37

What is the formula for mean rate or reaction

Answer 37

Product formed or reactant used up DIVIDED by time in seconds

Question 38

What is activation energy

Answer 38

Minimum amount of energy needed for a reaction to take place

Question 39

What is a catalyst

Answer 39

A substance that increases rate of reaction without being used up

Question 40

What is a reactant

Answer 40

Chemical substance that is used up during a reaction

Question 41

What is a product

Answer 41

A product is a substance that is made during a reaction

Question 42

What is retrograde motion

Answer 42

Where planets seem to move backwards