Exam (elaborations)
Exam (elaborations) CHM 111
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ENTAILS QUESTIONS AND ANSWERS
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, The nucleus of an atom consists ofA. electrons and neutrons
B. electrons and protons
C. protons and neutrons
D. All of the above - CORRECT ANSWERS-C. protons and neutrons
Element - CORRECT ANSWERS-Basic or elementary substances that cannot be
decomposed into simpler substances
Compound - CORRECT ANSWERS-A substance with a constant composition that can
be broken down into its elements by chemical processes
Solution - CORRECT ANSWERS-A homogeneous mixture of two or more substances
Physical change - CORRECT ANSWERS-Matter does not change its composition.
Chemical change - CORRECT ANSWERS-A substance that is transformed into a
chemically different substance.
Law of conservation of mass - CORRECT ANSWERS-Matter is not created nor
destroyed in any chemical or physical change
Intensive properties - CORRECT ANSWERS-They are independent of the amount of
matter examined and are used to identify substances.
Extensive properties - CORRECT ANSWERS-Relate to the amount of substance
present.
Precision - CORRECT ANSWERS-Indicates how closely different measurements of a
quantity agree with one another.
Accuracy - CORRECT ANSWERS-Indicates how well a measurement agrees with the
accepted or "true" value.
Isotopes - CORRECT ANSWERS-Atoms that have the same number of protons but
different numbers of neutrons
Stoichiometry - CORRECT ANSWERS-The quantitative study of reactants and products
in a chemical reaction
The mole - CORRECT ANSWERS-The SI base unit used to measure the amount of a
substance
Avogadro's number - CORRECT ANSWERS-6.02 x 10^23. The number of particles in
exactly one mole of a pure substance
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