electromagnetic and atomic spectrum 1.1

Question 1

avogadros constant

Answer 1

6.02 x 10^23

Question 2

what is avogadros constant

Answer 2

the amount of molecules in a mole

Question 3

what is electromagnetic radiation

Answer 3

a form of energy and consists of waves that can travel in a vacuum at a constant velocity (c)

Question 4

high frequency =

Answer 4

short wavelength

Question 5

low frequency =

Answer 5

long wavelength

Question 6

velocity

Answer 6

speed of light 3 x 10^8

Question 7

wavelength

Answer 7

the distance between adjacent crests or troughs of a wave

Question 8

frequency

Answer 8

the number of wavelengths that pass a fixed point in one second

Question 9

electromagnetic spectrum

Answer 9

the range of frequencies or wavelengths of electromagnetic radiation

Question 10

wave particles duality theory

Answer 10

when EM radiation energy can be described as a wave but also behave as a particle when it is emitted or absorbed

Question 11

photons

Answer 11

particles of energy that have a definite size and a definite energy value (quanta)

Question 12

excited state

Answer 12

when an electron absorbs energy it can move to a higher energy level

Question 13

ground state

Answer 13

this is the lowest possible electronic configuration the electrons in an atom can adopt

Question 14

what happens when electrons move down to ground state

Answer 14

energy is given out

Question 15

what does the photons energy depend on

Answer 15

where it is falling from or to

Question 16

when the photon energy changes what else changes

Answer 16

frequency, wavelength and colour

Question 17

what proves the existence of different energy levels in an atom

Answer 17

different elements having their own unique spectra

Question 18

what’s used to split white light

Answer 18

prisms which split the light into a rainbow

Question 19

when are emissions a series of discrete wavelengths

Answer 19

when the light source is from a chemical being heated

Question 20

atomic emission spectra

Answer 20

when energy is given out from elements

Question 21

atomic absorption spectra

Answer 21

when white light is directed through a gaseous sample of an element, some of the energy is absorbed by the element’s electrons, the radiation that emerges have certain wavelengths missing and this shows up as dark lines on a continuous spectrum

Question 22

what’s used to quantify a sample

Answer 22

spectra

Question 23

what is concentration related to

Answer 23

the absorption/ emission intensity

Question 24

what to use to work out an unknown concentration

Answer 24

use a calibration curve with a known concentration and is useful for metal concentrations in drinking water and food

Question 25

increase of energy in order of decreasing wavelength

Answer 25

radio waves, microwaves, infrared, visible, ultraviolet, x rays and gamma rays