Science 🧪

Question 1

What is force measured in

Answer 1

Newtons (N)

Question 2

What is the Big Bang Theory?

Answer 2

The Big Bang Theory is the leading explanation for the origin of the universe, stating that it began as a singularity approximately 13.8 billion years ago.

Question 3

True or False: The Big Bang was an explosion that created space and time.

Answer 3

True

Question 4

Fill in the blank: The universe has been expanding since the _______.

Answer 4

Big Bang

Question 5

What evidence supports the Big Bang Theory?

Answer 5

Evidence includes the cosmic microwave background radiation, the abundance of light elements, and the redshift of galaxies.

Question 6

Multiple Choice: Which of the following is a consequence of the Big Bang Theory? A) The universe is static B) The universe is expanding C) The universe is contracting

Answer 6

B) The universe is expanding

Question 7

True or False: The Big Bang Theory suggests that the universe will eventually stop expanding.

Answer 7

False

Question 8

What are the three main elements formed during the first few minutes after the Big Bang?

Answer 8

Hydrogen, helium, and lithium

Question 9

What is the Doppler effect?

Answer 9

The doppler effect is the increase or decrease of the frequency in waves as the source of the observer move towards or against eachothed

Question 10

True or False: The Doppler effect only applies to sound waves.

Answer 10

False. The Doppler effect applies to all types of waves, including light waves.

Question 11

Fill in the blank: The Doppler effect causes a _____ in frequency when the source of the wave is moving towards the observer.

Answer 11

increase

Question 12

What happens to the frequency of a wave when the source is moving away from the observer?

Answer 12

The frequency decreases.

Question 13

What is the definition of a rate of reaction

Answer 13

The rate of reaction refers to the speed at which the products are formed from the reactants in a chemical reaction

Question 14

What are some things that can affect a chemical reaction?

Answer 14

Temperature, surface area, use of a catalyst, concentration

Question 15

What does heat do to particles

Answer 15

Increase their kinetic energy

Question 16

What does cold do to particles

Answer 16

Decrease their kinetic energy

Question 17

What is kinetic energy

Answer 17

The source of energy for something moving

Question 18

Do catalysts get used up after a chemical reaction?

Answer 18

No

Question 19

Do catalysts have higher activation energy

Answer 19

No

Question 20

What is meant by the rate if a reaction

Answer 20

How fast the reactants are converted into products

Question 21

What does high concentration do with the collisions of particles?

Answer 21

More collisions

Question 22

What does low concentration do with the collision of particles

Answer 22

Fewer collsions

Question 23

What does decreasing the activation energy do to particles

Answer 23

More particles will have sufficient energy go overcome the energy barrier and react

Question 24

What is the symbol for potassium

Answer 24

K

Question 25

What is the unit for rate of reaction in a reaction involving change in mass

Answer 25

g/s (grams per second)

Question 26

What is the unit for rate of reaction in a reaction involiving change in volume?

Answer 26

cm3/s (centimetres cubed per second)

Question 27

What does increasing the pressure have on rate of reaction

Answer 27

Increases the rate of reaction

Question 28

What does increasing the surface area have on rate of reaction

Answer 28

Increases the rate of reaction

Question 29

What is definition of a catalyst

Answer 29

A substance that increases the rate of reaction but is not used up in the reaction

Question 30

How do catalysts increases the rate of a reaction?

Answer 30

They lower the activation energy of the reaction, so more collisions result in a reaction

Question 31

Where are geostationary satellites placed in space

Answer 31

Above the equator

Question 32

How does increasing the surface area affect rate of reactions

Answer 32

Increase in the number of collisions as more surface is exposed

Question 33

What is the equation for calculating the mean rate of reaction?

Answer 33

Mean rate = change in quantity of product or reactant / time taken

Question 34

What are some uses of satellites

Answer 34

Transmitting TV signals, comminications, monitoring the weather, studying earth and space, navigations and GPS

Question 35

Can some stars become black holes?

Answer 35

Yes

Question 36

What is a supernova?

Answer 36

When a star collapses it creates a mssive showkwave that blows its core apart, called a supernova

Question 37

What is a heliocentric model of the universe?

Answer 37

The planets and moons orbit the sun

Question 38

What is a geocentric model of the universe?

Answer 38

Instead of the sun at the centre, the earth is and everything orbits the earth

Question 39

What is a independent variable

Answer 39

The independent variable is the one that you change

Question 40

What is a control variable

Answer 40

A control variable is the variable you keep the same

Question 41

What is a dependent variable

Answer 41

The dependent variable is the variable that you measure

Question 42

What is an element?

Answer 42

An element is a substance that consists of only one type of atom and it cannot be broken down

Question 43

What is the name of a process when solid turns to gas?

Answer 43

Sublimation

Question 44

What is the name of the process when gas turns to solid?

Answer 44

Deposistion

Question 45

What is evaporation?

Answer 45

When a liquid turns into a gas

Question 46

What is condensation?

Answer 46

When a gas turns into a liquid

Question 47

What is the name of group 0 in the periodic table.

Answer 47

Noble gases