Term 2

Question 1

Describe the plum pudding model

Answer 1

Sphere of positive charge with electrons embedded

Question 2

What are group 0 elements called?

Answer 2

Noble gases

Question 3

What are the properties of noble gases?

Answer 3

Non-metals ynteactive colourless exist as single atoms

Question 4

Explain what happens to the boiling point of noble gases as you move down the group

Answer 4

boiling point increases
because the atoms increase in size as they have more electron shells
the intermolecular forces become stronger
so more energy is required to break these forces

Question 5

What are the properties of metals

Answer 5

good conductor of heat and electricity shiny high density malleable and ductile

Question 6

What are the properties of non metals

Answer 6

poor conductor of heat and electricity dull low density and brittle(break down easily)

Question 7

What subatomic particles are in the nucleus of the atom

Answer 7

proton and neutron

Question 8

what are the group one elements called

Answer 8

alkali metals

Question 9

what are the physical properties of group 1

Answer 9

low melting point soft and low density

Question 10

why does the reactivity of group one elements increase down the group

Answer 10

the number of shells increase
so the outermost elctron gets further from nucleus decreasing the forces of attraction between nucleus and outer electron
therefore easier to lose electrons

Question 11

what property was used to arrange elements in early periodic table

Answer 11

atomic weight

Question 12

Explain why lithium sodium and potassium are all in group 1 of the modern periodic table

Answer 12

all have one electron in outer shell so they have similar properties

Question 13

number of protons electron neutrons in chlorine 35/17

Answer 13

P 17
E 17
N 35-17 18

Question 14

what is the formula for gravitational potential energy

Answer 14

GPE= mass x gravitational field strength x height Ep = mgh

Question 15

what is the formula for kinetic energy

Answer 15

KE = 0.5 x mass x Velocity squared
Ek=0.5mv(sq)

Question 16

what is the formula for elastic potential

Answer 16

EPE = 0.5 x spring constant x extension squared l
Ee= 0.5ke(sq)

Question 17

how to calculate extension

Answer 17

e = final length - original length

Question 18

Formula for work done

Answer 18

work done = force x distance

Question 19

formula for power

Answer 19

power = energy transfer/time taken

Question 20

power

Answer 20

rate of energy transfer

Question 21

define work done

Answer 21

measure of energy transfer

Question 22

internal energy

Answer 22

total kinetic and potential energy of particle

Question 23

specific heat capacity

Answer 23

energy required to raise 1 kg of the material by 1 degrees celsius

Question 24

fórmula for specific heat capatuity

Answer 24

thermal energy= mass x shc x change in t

Question 25

specific latent heat

Answer 25

energy required to change the state of 1kg of a material without changing temperature

Question 26

two latent heats that each material has

Answer 26

latent heat of fusion= melt or freeze
latent hear of vapourisation(boil or condense)

Question 27

specific latent heat

Answer 27

thermal energy = mass x specific latent hear