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THE MCAT-CHEM 7

STOICHIOMETRY & RADIOACTIVE DECAY

QuestionAnswer
Carbon has how many amu? 12
what does 1 amu equal to? 1 g / mol
density mass / volume
specific gravity density of substance / density of water
Does specific gravity have units? NO
What is characteristic of oxidizing agents? lewis acids, permanganates, dichromate, and lots of oxygens
What is characteristic of reducing agents? lewis bases and lots of hydrogens
Disproportionation reactions single species undergo both oxidation and reduction
For a redox titration, at equivalence potential, cell potential = 0
What does an alpha particle consist of? 2 protons and 2 neutrons
What happens during gamma decay? nucleus transitions from higher energy level to lower energy level and emits a gamma ray
Difference btwn gamma ray and photon photon is emitted when energy levels are close to each other, gamma ray emitted when energy level differences are a lot bigger
What is a beta particle? -electron -positron (antimatter equivalent to an electron)
What happens during alpha decay? loses 4 / 2 He atom (subtract form original)
What happens during beta - decay? lose an electron, gain a proton, lose a neutron --> no net change in mass number
What happens during beta + decay? lose a positron, lose a proton, gain a neutron --> no net change in mass number
What happens to neutron during beta-minus decay? turns into a proton electron, and antineutrino --> electron and antineutrino fly away to leave one more proton than original
What happens to proton during beta-plus decay? proton turns into neutron, positron, and neutrino --> positron and neutrino fly away to leave one more neutron than before
Does number of protons and neutrons change during beta minus/plus decay? NO
Do any numbers change during gamma decay? NO
Created by: 507935299 on 2012-07-09



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