particle model of matter questions i struggled on

Question 1

why might we use a vernier calliper or micrometre screw gauge to measure the length rather than a ruler?

Answer 1

they have higher resolution so measurements would be more precise

Question 2

what does heating a system do to its internal energy?

Answer 2

increase internal energy by increasing the average kinetic energy of particles

Question 3

what happens when a substance changes state?

Answer 3

there is an increase in the potential energy of particles in order to change the arrangement of particles

Question 4

define ‘specific latent heat’

Answer 4

the energy required to change the state of 1kg of the substance at a constant temperature

Question 5

define ‘specific latent heat of fusion’

Answer 5

the energy required to change the state of 1kg of the substance from solid to liquid at a constant temperature

Question 6

define ‘specific latent heat of vaporisation’

Answer 6

the energy required to change the state of 1kg of the substance from liquid to gas at a constant temperature