gen chem Flashcards
How is the atomic weight of an element calculated?
It is a weighted average of its isotopes. (% isotope A)(isotope A amu) + (% isotope B)(isotope B amu) = atomic weight in amu
Alpha decay equation
A/Z X -> A-4/Z-2 Y + 4/2 alpha
Beta - decay equation
A/Z X -> A/Z+1 Y + 0/-1 beta
When the mcat says “beta decay”, which type do they mean?
Beta -
Positron emission equation
A/Z X -> A/Z-1 Y + 0/+1 beta
Electron capture equation
A/Z X + 0/-1 e- -> A/Z-1 Y
Gamma decay equation
A/Z X* -> A/Z X + 0/0 gamma
Half life eq
N=N0 (1/2) ^ (T/half life)
What is the order of the nine most electronegative elements?`
F > O > N = Cl > Br > I > S > C = H (Remember hopscotch pattern)
What is the tell-tale sign of a combustion reaction?
Produces CO2 and H2O
General idea behind a neutralization reaction
Acid and base combine to produce a salt and usually water
nano
n, 10^-9
micro
u, 10^-6
milli
m, 10^-3
centi
c, 10^-2
kilo
k, 10^3
mega
M, 10^6
angstrom
A with dot above it, 10^-10 m
density of water
1 g / cm^3 aka 1 g / mL
ammonium
NH4+
hydronium
H3O+
acetate
CH3CO2-
bicarbonate
HCO3-
cyanide
CN-
