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Flashcards in unit 7 Deck (33)
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1

electromagnetic radiation

light

2

Planck's constant

allows us to relate energy and frequency; represented by "h"

3

rods & cones

colles in the eye which detect light

4

spectrometer

scientific instrument that can analyze the light in a star and determine all of the individual wavelengths that make it up-determining its elemental composition. Method known as spectroscopy. Can also be applied to chemicals

5

quantum assumption

electrons can jump orbit but can not be anywhere in between

6

excited

when an electron moves from an orbit close to the nucleus to an orbit far away from the nucleus -- opposite "de-excited"

7

wavelength

the distance between the crests or troughs of a wave

8

amplitude

a measure of the height of the crests or the depths of the troughs of a wave

9

physical constant

a measurable quantity in nature that does not change

10

frequency

the number of wave crests or troughs that pass a given point each second

11

When wavelength is --- frequency is small

large

12

When wavelength is small frequency is

large

13

as a light waves frequency increases, its energy

increases

14

As a light waves wavelength increases its energy

decreases

15

crookes tube

glass tube with a tiny amount of gas, hooked up to a battery, resulting in a faint yellow-grebe glow on the end of the tube. sometimes referred to as a cathode ray tube

16

Every substance on earth has

electrical charges

17

electron

negative element of atom that has common ration of charge to mass

18

proton

positively charged

19

nutron

neutral

20

Atomic number

to number on each box in the periodic table; tells how many protons

21

all atoms have equal numbers of

electrons and protons

22

isotopes

Atoms with the same number of protons but different numbers of neutrons

23

isotopes behave identically in their chemistry; the main difference between them is

their mass

24

Mass number

the total number of neutrons and protons in an atom

25

isotopic enrichment

the process of artificially increasing the amount of 235U in the Uranium (when making a nuclear bomb)

26

Rutherford model

planetary model

27

particle/wave duality theory

the theory that light sometimes behaves as a particle and sometimes as a wave

28

quantum mechanical model

says that, in addition to the bohr model, electrons need energy to go into orbits that are far away from the nucleus and need to release energy in the form of light in order to get back to orbits close to the nucleus

29

orbitals

the 'clouds' in which electrons orbit, according to the quantum mechanical model

30

s orbital

simplest type of orbital; spherically shaped