3.1 and 3.2

Question 1

the law of conservation of mass

Answer 1

the weight of the reagents equals the mass of the products

Question 2

Dalton’s theory of the atom

Answer 2

atoms are the smallest solid indivisible units of matter which explain conservation of mass

Question 3

what was the first subatomic particle to be invented

Answer 3

the electron

Question 4

what experiment was used to find the electron

Answer 4

passing a high voltage electric current through a gas electrons pass between electrodes

Question 5

who found the mass/charge ratio of the electron

Answer 5

J.J. Thompson

Question 6

how was the charge of an electron found

Answer 6

X-rays ionise the air

the electrons released are attracted to positive plate and slows the rate of fall

Question 7

how was the charge/mass ratio of the electron found

Answer 7

applying electric and magnetic fields to a beam of electrons and use the deviation

Question 8

who found the neutron and when

Answer 8

James Chadwick 1932

Question 9

how was the orbital structure of the atom found

Answer 9

shoot alpha particles at gold sheet

some deflected some bounce back

Question 10

who found the orbital structure of the atom

Answer 10

Rutherford

Question 11

equation for speed of light and wavelength

Answer 11

c = lamda v

speed of light = wavelength x frequency

Question 12

what is wavelength

Answer 12

the distance between two wave crests

Question 13

define amplitude

Answer 13

the high of the wave crest

Question 14

define frequency

Answer 14

the number of wave crests which pass through the origin every second

Question 15

units for frequency

Answer 15

hertz

Question 16

does red light have a higher or lower frequency than violet light

Answer 16

lower

Question 17

equation for energy of a photon

Answer 17

E = hv
energy = plancks constant x frequency

Question 18

what is the photoelectric affect

Answer 18

when ultraviolet radiation over a certain frequency threshold hits a metal electrons are ejected

Question 19

how does the photoelectric affect provide evidence for light as a particle

Answer 19

the electrons are only ejected if each individual particle has enough energy to eject it you can’t keep adding the energy and eventually the electrons come off

Question 20

define wave particle duality of light

Answer 20

light is considered both a wave and a particle

Question 21

does diffraction give evidence for light as a particle or a wave

Answer 21

a wave

Question 22

does destructive and constructive interference give evidence for light as a particle or a wave

Answer 22

a wave

Question 23

Thomas Young’s experiment on light as a wave

Answer 23

cut two slit
send light through
it has light and dark strips
showing constructive and destructive interference