Chem 121 UNR final Questions and Correct Answers

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Chem 121 UNR final Questions and
Correct Answers
Homogenous Mixture Answer: mixture same
throughout EX) Air


Heterogenous Mixture Answer: Mixture different
throughout EX) Smoke


Density= Answer: Mass(g)/Volume(l)


Filtration Answer: Used to sperate a hetro mixture


Distillation Answer: from Homo Mixture, Use boiling
points


Kilo Answer: 1x10^3


Centi Answer: 1x10^-2


Mili Answer: 1x10^-3


Micro Answer: 1x10^-6


Nano Answer: 1x10^9

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Pico Answer: 1x10^-12


Add or Subtract = Answer: number of decimal places


multiply or divide = Answer: number of sig figs


Never a sig fig Answer: 0's at the beginning of a
number


0's between 2 sig fig Answer: Are significant


all non zero Answer: are significant


0's at the end, when decimal place is present Answer:
are significant


Law of conservation of mass Answer: matter cannot
be created or destroyed


law of constant composition Answer: relative
proportions of mass are the same


Ernest Ruthford's Experiment Answer: shot particles
at a relevance: discovered positively charged particles,
the Nucleus

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