Chemistry equations Flashcards
Formula used to find fingerprint of gaseous elements
f= frequency lambda=wavelength c= speed of light h= plank’s constant (6.63 x 10-34 J•s)
**Can only predict E of atoms or ions with one electron (Bohr atom)
Change in E predicts wavelength of photons emitted when electron fall to lower E level (emission) or jump to higher E level (absorption)
Name the type of radioactive decaythat can be stopped by skin or paper
Alpha Decay
Type of radioactive decay that emits 2 protons and 2 neutrons
Alpha Decay
21084PO ►20682PO
Alpha Decay
Too many neutrons, so neutron is converted to proton + electron
Beta Neg. decay
Atomic Number + 1
Beta Neg Decay
146C►147C
Beta Neg Decay
Too few neutrons, proton ocnverted to neutron and poistron
Beta Pos. Decay
Atomic # = -1
Beta Pos. Decay or Electron Capture
189C►188C
Beta Pos Decay
What is the difference b/w Electron Capture and Beta Pos. Decay?
both have too few neutrons, but electron capture captures electron from closest shell to convert proton into neutron. Beta pos. decay converts proton into neutron without capturing electron.
What type of radioactive decay needs concrete or Lead to stop?
Gamma Decay
Atomic # and mass stay the same in what radioactive decay?
Gamma
What does Gamma Decay emmit?
gamma photons
Nuclear Binding Energy
c=3x108m/s
1ev= 1.6x10-19J
1amu= 1.66x10-27kg
EBin ev for equation
m in amu
The greater the binding energy, the more ______ the nucleus
stable
Formal Charge Equation
FC=V-1/2B-L
FC= formal charge
V=#valence electrons
B=#bonding electrons
L=#lone-paired electrons
Amount of E required to complete transition ___
heat of transition (Delta H)
what is formula for calculating energy required to complete phase transition/change
q=nXΔH
q=heat
n= #of moles
H=change of phase change
q=nXΔH
q and H are +, heat is _____
absorbed
q=nXΔH
q and H are -, heat is _______________
released
To calculate temperature change in a reaction
q=mcΔT
q=heat added or released
m=mass of sample
c=specific heat of substance