specific latent heat

Question 1

latent heat

Answer 1

the amount of energy required to change the state of 1 kilogram (kg) of a material without changing its temperature.

Question 2

specific latent equation

Answer 2

specific latent heat j/kg = energy/mass

Question 3

How to measure the specific latent heat of ice (or of water)

Answer 3

Use a low-voltage heater or melt the ice (or boil the water)

Question 4

the pressure of gas

Answer 4

Caused by the random impacts of gas molecules on surfaces that are in contact with the gas

Question 5

what is specific heat capacity

Answer 5

The specific heat capacity is the amount of heat it takes to change the temperature of one gram of substance by 1°C.

Question 6

If the temperature of a gas in a sealed container is increased, the pressure of the gas increases because:

Answer 6

• the molecules move faster so they hit the surfaces with not force
• the number of impacts per second of gas molecules on the surfaces of a sealed container increases, so the total force of the impacts increases

Question 7

the unpredictable motion of smoke particles

Answer 7

evidence of the random motion of gas molecules

Question 8

What does changing the volume of a gas do to the pressure?

Answer 8

decreasing the volume of a gas will increase its pressure, while increasing the volume will decrease its pressure;

Question 9

For a fixed mass of gas at constant temperature:

Answer 9

-its pressure is increased if its volume is decreased
- reducing the volume of a gas increases the number of molecular impacts per second on the surfaces that are in contact with the gas

Question 10

If the mass and the temperature of the gas do not change

Answer 10

Use the equation p V = constant

Question 11

What are the 3 things that can affect pressure?

Answer 11

temperature, volume, and the number of particles (amount of gas) present in a closed container;

Question 12

What does heating up a gas do to the pressure?

Answer 12

Increasing the temperature of a gas increases the pressure and the energy of the gas particles. These higher energy particles move faster, colliding harder .

Question 13

What does changing the concentration of a gas do to the pressure?

Answer 13

Increasing the concentration of a gas directly increases its pressure, as a higher concentration means more gas molecules are packed into the same volume,

Question 14

how is pressure in gasses caused?

Answer 14

caused by the constant, random collisions of gas particles with the walls of their container