Exam 1 Flashcards
2) How much energy is contained in 1 mole of 552 nm photons.
What equation would you use for this example
E= h (c/lambda) E being energy h being constant c being speed of light lambda being wavelength = given usually within problemm
When you lose an electron you get
When you gain an electron you get
lose = cation
gain = anion
out of proton, neutron, and electron, which has the smallest mass
electron has the smallest mass
proton and neutron = same
What is an isotope
atoms with same number of protons but dif number of neutrons
What is an ion
when atom gains or loses electrons to become charged particles (cation, anion)
Calculate the wavelength (in nm) of the blue light emitted by a mercury lamp with a frequency of 6.88 × 1014 Hz.
what is the equation would you use to start this problem
lambda = c/v
v being the frequency provided
Calculate the energy of the red light emitted by a neon atom with a wavelength of 703.2 nm
what equation would you use to start this problem
E= h (c/lambda)
Calculate the wavelength of an electron (m = 9.11 × 10-31 kg) moving at 3.66 × 106 m/s
what equation would you use to start this problem
lambda = h/ (m * v)
Determine the energy change associated with the transition from n=2to n=5 in the hydrogen atom.
what is the equation that starts this problem
ΔE=-2.18 times 10 to the -18 J ((1/n squared (final)) - (1/n squared (initial))
how do you convert nm to m
1 nm = 10 to the -9 m
In regards to atomic radius what two directions indicate that the radius is increasing
down the graph and to the left = increasing
What has the smallest radius between a cation, anion, or neutral
cation
valance electrons refer to…..
to the electrons in the outermost energy cloud
describe an atom
neutrons and protons in the nucleus with electrons surrounding in the electron cloud
ions differ from atoms by the number of __________
electrons
What are the possible orbitals for n=4
s,p,d,f
what does the law of conservation of mass state
when a chemical reaction occurs, the total mass substances involved in the reaction does not change
What does the law of definite proportions state
all samples of a given compound have the same proportions of their constituent elements
example = water breaks down into an 8:1 ration
What are the 4 postulates of the atomic theory
- each element is composed of tiny, indestructible particles called atoms
- all atoms of a given element have the same mass and other properteries that distinguish them from the atoms of other elements
- atoms combine In simple, whole number tatios to form compounds
- atoms of one element cannot change into atoms of another element
What did the gold foil experiment prove
the majority of space in atom = empty space
the atoms contains positively charged nucleus
the mass of atom is concentrated in nucleus
positive charge is considered in one location
what is the amplitude
what is the wavelength
a= vertical height of crest
w= deistance between adjacent crests
what is diffeaction
when wave encounters an obstacle that is comparable in size to its wavelength it bends around it
what is mj to J
10 ot the -3
how is the periodic table organized
atomic number
