General Chemistry Unit #1 Flashcards
What is the Wavelength (upside down y) unit?
meters (m)
What is the Frequency (v) unit?
Hz (1/s or s^-1)
As wavelength increases, frequency…? Why?
Decreases, because the energy decreases which means the frequency isn’t as high
Longer waves = lower frequency
As frequency increases, wavelength…? Why?
Decreases, because the energy increases which makes the waves of wavelength smaller so it decreases
Shorter waves = higher energy/frequency
What happens to the energy of a photon if the Wavelength is doubled?
Energy is reduced by one-half (1/2)
Red light has a _____ frequency and a _____ wavelength than ultraviolet rays.
lower, longer
Energy of a photon is ______ proportional to frequency, and _______ proportional to wavelength.
Directly, inversely
If the frequency of an electromagnetic wave increases, the wavelength will _____.
Decrease
What is Planck’s constant?
(h)
Wavelength to Energy
h x c/wavelength
Frequency to energy
E = hv
Wavelength to Frequency
v = c/wavelength
Frequency to Wavelength
Wavelength = c/v
Isotope
Equal numbers of protons, but different number of neutrons
Neutral atoms of all isotopes of a given element have the same…
number electrons
Which two particles of the atom have nearly identical masses?
Proton and Neutron
The net charge on an atom of a given element changes as ______ are added or removed.
Electrons
Mass Number
Protons + Neutrons
Atomic Number
Protons
Neutron amount
Isotope/Mass # - Protons
Elements of which of the following groups on the periodic table always occur naturally as monatomic elements?
Noble gases
Monatomic
A charged particle made up of a single atom
Halogens
Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), and Astatine (At)
Protons
a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
Neutrons
a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
Electrons
a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
Ions
an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
Rutherford’s gold foil experiment determined that
Most of the space in an atom is empty except for a concentrated area called the nucleus.
Which of the following statements about subatomic particles are true?
I. Protons and neutrons have charges of opposite signs but the same magnitude.
II. Protons and neutrons have about the same mass.
III. A neutral atom always has the same number of neutrons and electrons.
II.
I. Protons and neutrons have charges of opposite signs but the same magnitude.
II. Protons and neutrons have about the same mass.
III. A neutral atom always has the same number of neutrons and electrons.
I. and III.
Same column =
Chemically similar
Ionic Bond
Between a metal and a nonmetal
All halogens form ions with a -1 charge, true or false?
True
