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Straighterline CHEM101 Final exam with 100- correct answers.
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Straighterline CHEM101 Final exam with 100- correct answers.
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StraighterlineCHEM101 Final
exam with 100%
correct answers
total number of neutrons and protons in an atom;
# protons + # electrons - answer Mass Number
Most nonmetallic elements are found in which
block of the periodic table? - answer p
Ernest Rutherford disproved J.J. Thomson's plum-
pudding model of the atom by showing that... -
answer Positive matter is concentrated in the
central core
Plants use up copious amounts of which alkali
metal, preventing most of it from being washed
out to sea? - answer Potassium
,What is the ratio of reactants and products in the
chemical equation?
__NaOH + __H2SO4 --> __Na2SO4 + __H2O - answer
2:1:1:2
What is Avogadro's number? - answer the number
of ATOMS in 12g of Carbon-12
1 g = 6.022 × 1023 amu
What is the reducing agent in the following
equation?
Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g) - answer
Mg
Which arrangement accurately describes the
standard entropy values at different phases? -
answer (s) < (l) < (g)
What are the most stable isotopes? - answer 2, 8,
20, 50, 82 or 126 protons
What element has been oxidized and what element
has been reduced?
,3CuS + 8HNO3 --> 3CuSO4 + 8NO + 4H2O - answer
S = oxidized
N = reduced
How do you convert from moles to grams? - answer
multiply the atomic mass (grams) by the number of
moles
How do you convert from grams to moles? - answer
Divide the total number of grams by the atomic
mass (grams) of 1 mole
measure of the amount of matter - answer Mass
made from atoms of 2+ elements that are
chemically bonded; cannot be separated into
simpler substances by any physical process; can be
separated by a chemical reaction - answer
Compound
Definite shape and volume
Doesn't conform to shape of container
Particles are very close together in orderly fashion
with little freedom of motion - answer Solid
, Definite volume, indefinite shape
Conforms to shape of the part of the container it
fills
Particles are close together but not rigidly in
position with freedom to move past each other -
answer Liquid
No definite shape or volume
Conforms to shape and volume of container
Particles separated by distances very large
compared to size of particles - answer Gas
Color, melting point, boiling point
Observed and measured without changing identity
of substance - answer Physical Property
Observed by performing a chemical change -
answer Chemical Property
Combination of 2+ elements, each retains its
identity and properties
Can be separated by physical means into pure
components without changing identity of
compounds - answer Mixture
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