P6 molecules and matter

Question 1

density

Answer 1

mass / volume
objects w density lower than water float

Question 2

solid

Answer 2

held next to each other in fixed positions
least energetic
vibrate around fixed point

Question 3

liquid

Answer 3

in contact
move at random
can move other each other
more energetic than solid, less that gas

Question 4

gas

Answer 4

move randomly
far apart
less dense than solids + liquids
most energetic

Question 5

boiling vs evaporation

Answer 5

evaporation occurs at surface below substance boiling point
boiling happens throughout liquid at boiling point

Question 6

BP off graph

Answer 6

flat section of temp - time graph

Question 7

heating a substance

Answer 7

temp rises- kinetic energy increases
if it melts/ boils- potential energy of particles increases

Question 8

cause of pressure

Answer 8

particles of gas repeatedly hitting surface

Question 9

latent heat

Answer 9

energy needed for substance to change state w/o changing temp of substance

Question 10

specific latent heat of fusion (or vaporisation)

Answer 10

energy needed to melt ( or boil) 1kg of a substance without changing its temp

Question 11

temp and pressure

Answer 11

molecules move faster
hit surface w more force
number of impacts in given time increases
so total force increases

Question 12

fixed mass of gas at constant temp

Answer 12

pressure increased if volume decreased
increases no. of molecular impacts per second non surfaces in contact with the gas

Question 13

constant eq

Answer 13

pressure x volume