Chem 130 Exam #1 Comprehensive Questions (Frequently Tested) and Complete Solutions Graded A+

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Chem 130 Exam #1 Comprehensive
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Law of Concentration of Mass - Answer: the total mass remains
constant during a chemical change

mass of substances before reaction=mass after

law of definite proportions - Answer: a pure compound always
contains definite or constant proportions of the elements by mass

, law of multiple proportions - Answer: when two elements form
more than one compound, the masses of one element in these
compounds for a fixed mass of the other element are in rations of
small whole numbers

atomic number (Z) - Answer: the number of protons in the
nucleus of an atom

mass number (A) - Answer: the total number of electrons and
neutrons in a nucleus

methane - Answer: CH4

Ethane - Answer: C2H6

propane - Answer: C3H8

acetylene - Answer: C2H2

benzene - Answer: C6H6

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