Y11 Mock Particles of Matter

Question 1

density of a regular object practical

Answer 1

1, use a mass balance to find weight in grams of object and record
2. use a ruler to measure the length height and width
3. multiply these three values for a volume in cm^3

Question 2

density of an irregular object practical

Answer 2

1. use mass balance to measure weight of the object in grams
2. fill a displacement can until the water just starts to leak out of the spout
3. put a measuring cylinder under the spout
4. place the irregular object in the displacement can
5. water will be displaced and come out of the spout into the measuring cylinder
6. read and record value in cm3 of displaced water
7. use density = mass/vol with the values

Question 3

how can substances change state

Answer 3

either transferring more energy to them or by transferring heat energy away

Question 4

how can physical changes be reversed

Answer 4

properties return to original ones

Question 5

why is mass conserved

Answer 5

number of particles does not change but instead their arrangement

Question 6

melting

Answer 6

solid to liquid

Question 7

freezing

Answer 7

liquid to solid

Question 8

evaporation

Answer 8

liquid to gas

Question 9

condensation

Answer 9

gas to liquid

Question 10

sublimation

Answer 10

solid to gas

Question 11

what is internal energy

Answer 11

energy stored by particles of a substance

Question 12

what is internal energy the sum of

Answer 12

kinetic energy of the particles by heating and elastic potential energy due to the bonds between particles (by changing the state)

Question 13

what des the increase of temperature depend on

Answer 13

the increase of temperature depends on the mass of the substance heated , the type of material , and the energy input to the system

Question 14

what is the motion of gas particles

Answer 14

random and spontaneous

Question 15

what is temp of gas particles related to

Answer 15

temperature is related to the average kinetic energy pf the molecules

Question 16

how is pressure in a gas formed (5 points)

Answer 16

when the container is heated
the particles gain kinetic energy
kinetic energy causes the particles to move around and collide with container walls increasing average speed of the gas particles
this increases the force the particles exert on the container
this builds up pressure

Question 17

factors that increase gas pressure

Answer 17

doing work on a gas increases internal energy of the gas and can increase the temp which increases kinetic energy