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PURDUE CHEM 115 FINAL FALL23 with 100% correct answers
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PURDUE CHEM 115 FINAL FALL23 with 100% correct answers
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PURDUE CHEM 115 FINAL FALL23sig fig rules - correct answer ✔✔significant = nonzero, trapper zeros, trailing zeros IF there's a decimal
point
Mult/div = least # of sig figs
add/sub = least # of decimal places
law of conservation of mass - correct answer ✔✔atoms are not created or destroyed in a chemical
reaction
isotope - correct answer ✔✔atoms of the same element with a different number of neutrons and
therefore a different mass number
atomic mass of an element is... - correct answer ✔✔a weighted average of the masses of its isotopes
atomic structure - correct answer ✔✔dense positive nucleus, outer shell of electrons
groups and periods - correct answer ✔✔group = horizontal column
period = vertical row
limiting reactant - correct answer ✔✔the substance that controls the quantity of product that can form
in a chemical reaction
chemical vs nuclear reactions - correct answer ✔✔atoms in nuclear reactions change identity, involve
protons and neutrons, have an energy change, and are not affected by temp, catalysts, etc
nucleon - correct answer ✔✔protons and neutrons
nuclide - correct answer ✔✔nucleus with a particular composition
, spontaneous decay - correct answer ✔✔no collisions, alpha, beta, electron capture
induced reaction - correct answer ✔✔fission, fusion
penetrating power of radiation - correct answer ✔✔(low to high) alpha, beta, photon (y), neutron
when balancing nuclear reactions... - correct answer ✔✔conserve mass number and atomic number
(top = top, bottom = bottom)
more neutrons than protons... - correct answer ✔✔beta decay
more protons than neutrons... - correct answer ✔✔positron decay or electron capture
above the band of stability (atomic number > 83) - correct answer ✔✔alpha decay
band of stability chart - correct answer ✔✔above band B- decay, beyond band alpha decay, below band
B+ emission and e- capture
alpha emission - correct answer ✔✔helium-4 nucleus
+4 mass, +2 atomic number
beta emission - correct answer ✔✔electron, B- or positron, B+
+/- 1 atomic number
electron capture - correct answer ✔✔e-
-1 atomic number
photon (y) / gamma - correct answer ✔✔no effect on charge or mass
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