PHYSICS, latent and internal heat, matter, density

Question 1

What is the equation for density?

Answer 1

Mass/volume

Question 2

What happens to a particles of a substance when they are heated up?

Answer 2

They gain kinetic energy.

Question 3

What is the units for pressure?

Answer 3

Pascals

Question 4

What is gas pressure?

Answer 4

The force a gas exerts on a surface per unit area when colliding with the walls of their container.

Question 5

What is the Brownian motion?

Answer 5

The random motion of particles in a liquid or gas.

Question 6

What does potential energy measure?

Answer 6

How arranged the particles are in their container.

Question 7

What is meant by internal energy?

Answer 7

The total potential and kinetic energy stores of all the particles in the substance.

Question 8

What does latent heat tell us?

Answer 8

How much energy is needed to change the state of 1kg of a substance at a constant temperature.

Question 9

What is the equation for latent heat?

Answer 9

Energy needed (J)=mass(Kg) x specific latent heat(J/Kg)

Question 10

What is the latent heat of fusion?

Answer 10

Melting and freezing.

Question 11

What is meant by heat capacity?

Answer 11

The energy needed to raise the temperature of 1kg of a substance by 1degree celsius.

Question 12

How much heat capacity does it take us to heat a litre of water up by 1 degree celsius?

Answer 12

4200 j/kg degree celsius

Question 13

Equation for power?

Answer 13

Power=voltage x current

Question 14

Equation for energy?

Answer 14

Energy=power x time

Question 15

At what temperature does water boil at?

Answer 15

100 degrees celsius

Question 16

What are the two changes of state between a solid to a liquid and a liquid to a gas?

Answer 16

fusion and vapourisation

Question 17

In a gas, why does increasing the volume of the container decrease the pressure?

Answer 17

The particles are colliding with the walls of the container less often because the volume is larger.

Question 18

What is the equation for specific heat capacity?

Answer 18

Change in energy=mass x specific heat capacity x temperature change

Question 19

What is Boyle’s law?

Answer 19

Volume x pressure = constant. Initial pressure and volume = Final pressure and volume.

Question 20

What is the structure of particles in a solid and how do its particles move?

Answer 20

A solid’s particles are arranged in rows and columns and are tightly packed together all touching. They can’t flow and they vibrate in their arrangement. They are in a fixed position.

Question 21

What is the structure of particle’s in a liquid and how do its particles move?

Answer 21

A liquid’s particles can flow easily and can change shape depending on the container they are in. Its volume always stays the same and a some of the particles are touching and some are not. Particles are slightly scattered, can slide over each other and are becoming random.

Question 22

What is the structure of particles in a gas and how do its particles move?

Answer 22

A gases particles are randomly arranged and spaced out. They move around freely and randomly, the particles are not touching and they can flow. The particles move quickly.

Question 23

What is Latent heat?

Answer 23

The heat required to convert a solid into a liquid or vapour, or a liquid into a vapour.