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Chem-Module 7

Crookes tube The experimental instrument that William Crookes used to identify cathode rays (also called cathode ray tube)
Cathode ray tube The experimental instrument that William Crookes used to identify cathode rays (also called Crookes tube)
Like charges _____ one another repel
Opposite charges _____ each other attract
What are the particles in an atom? Proton, neutron, electron
An atom's atomic number tells you how many _____ it contains. protons
All atoms have an _______ number of electrons and protons equal
Protons are _______ charged positively
Electrons are ________ charged negatively
Neutrons are _______ charged neutrally
Isotopes Atoms with the same number of protons but different numbers of neutrons
Isotopes behave ______ in the their chemistry; the main difference between them is their _______ identically, mass
Mass number The total number of neutrons and protons in an atom
The planetary model of an atoms is also called the Rutherford model
The protons and neutrons in an atom are called the nucleus
Light is made up of _____ and small particles called ______ waves, photons
Particle/Wave Duality Theory The theory that light sometimes behaves as a particle and sometimes behaves as a wave
The high point of a light wave is called the crest
The low point of a light wave is called the trough
Wavelength The distance between crests (or troughs) of a wave
Amplitude A measure of the eight of the crests or the depths of the troughs on a wave
nano means 10^-9
The range of light we can see (the rainbow) is called the visible spectrum
How do you remember which light has the longest wavelength, and the descending order? ROY G. BIV
Physical constant A measurable quantity in nature that does not change
Frequency The number of wave crests (or troughs) that pass a given point each second
Hertz (Hz) means 1/second
When wavelength is ______, frequency is ______. When wavelength is ______, frequency is _____. large, small; small large
All expanses of light are called the electromagnetic spectrum
As a light wave's frequency _______, its energy _______. As its frequency ______ its energy _______. increases, increases; decreases, decreases
As a light wave's wavelength _______, its energy ______. As its wavelength _______, its energy _______. increases, decreases; decreases, increases
Planck's constant is 6.63 x 10^-34 Hz
A scientific instrument that can analyze light and determine individual wavelengths that make it up is called a spectrometer
A spectrometer uses ________ to analyze light spectroscopy
When an electron gets energy, it is excited
When an electron releases energy, it is de-excited
All forms of matter try to stay in their ______ possible energy state lowest
Ground state The lowest possible energy state for a given substance
An atom is mostly made up of nothing
Who discovered protons? Ernest Rutherford
Created by: akikoandpoog



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