Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size Small Size show me how

Normal Size Small Size show me how

# MCAT Equations

Question | Answer |
---|---|

What is the Atomic number? | (Z) the number of protons |

What is the Mass number? | (A) the number of protons plus neutrons |

What is the Atomic mass unit? | 1.66* 10^23 |

What is the equation for energy (E)? | E = hf (h=Planck's constant) (f=frequency) |

What is Planck's constant? | 6.626 * 10 ^ -34 J*s |

What is the equation for the angular momentum of an electron? | L=nh / 2pi (n=quantum number) |

What is the equation for the energy of an electron? | E= -Rh / N^2 (Rh = Rydberg constant=2.18 *10^-18 J/electron) |

What is Rydbergs constant? | 2.18*10^-18 J/electron |

What is the equation for electromagnetic energy? | E=hc / (wavelength) c=speed of light in vacuum(3*10^8 m/s) =wavelength of the radiation |

What is the equation for the energy of an emitted photon? | E=hc = -Rh [(1/n^2initial) - (1/n^2final) |

What is the Heisenberg uncertainty principle? | It is impossible to simultaneously determine momentum and position of an electron |

What is the principle Quantum number? | (n) is the energy level and radius of an electrons orbilal |

What is the Azmuthal Quantum number? | (l) is the shape and number of subshells l=0-(n-1) 0=s 1=p 2=d 3=f |

What is the Magnetic Quantum number? | (m1) is the orbital within a subunit where an electron is likely to be found at a given moment in time m1= -l -> +l cant be l |

What is the spin quantum number? | (ms) is the spin orientation; can be -1/2 or +1/2 |

What is the atomic radius? | 1/2 the distance between the centers of two atoms of that element touching each other |

What is ionization energy | (IE) energy required to remove an electron from a gaseous atom or ion |

What is electronegativity? | the attractive force taht an atom will exert on an electron in a chemical bond. it is the attraction for bonding electrons |

What is the equation for formal charge? | V-N nonbonding - 1/2 N bonding |

How many bonds are in a trigonal planar arrangement? | 3 |

How many bonds are in a tetrahedral arrangement? | 4 |

How many bonds are in a trigonal bipyrimidal arrangement? | 5 |

How many bonds are in a octahedral arrangement? | 6 |

What are dispersion forces/London forces? | They are short lived and rapidly shifting dipoles |

What are dipole-dipole interactions? | they occur when the positive region of one molecule is close to the negative region of another molecule |

What is the molecular weight? | It is the sum of atomic weights of all of the atoms in a molecule |

What is the formula weight? | It is the addition of atomic weights of constituent ions according to its empirical formula |

What is Avagadros number? | 6.022*10^23 |

What is the equation for gram equivalent weight? | molar mass / n (protons, hydroxide ions, electrons, monovalent ions) |

What is the equation for equivalents? | mass of compound (g) / gram equivalent weight (g) |

What is the equation for molarity? | normality / n |

What is normality? | The measure of concentration = equivalents / liter |

What is the empirical formula? | It is the simplest whole number ratio of elements in a compound |

What is a molecular formula? | It is the exact number of atoms of each element in the compound |

What is the equation for percent composition? | (mass of X in formula / formula weight of compound) * 100 |

What is the equation for percent yield? | (actual yield / theoretical yield) * 100 |

Created by:
audrey90