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Chem Final (Straighterline) Exm/10 Complete Questions and Answers
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Chem Final (Straighterline) Exm/10 CompleteQuestions and Answers
How is the mass number of an element different from its atomic number? - -
The mass number represents the total number of neutrons and protons in
one atom of the element as opposed to the total number of protons.
-Most nonmetallic elements are found in which block of the periodic table of
elements? - -p
-Ernest Rutherford disproved J.J. Thomson's plum-pudding model of the atom
by showing that - -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? - -potassium
-What is the ratio of reactants and products in the chemical equation?
__NaOH + __H2SO4 -> __Na2SO4 + __H2O - -2:1:1:2
-Which of the following isotopes is likely to be the most stable? - -Sn-50
(because the most stable ones are 2,8,20,50,82 or 126 protons)
-The initial volume of a system containing 1 mole of an ideal gas at 292°
Kelvin and 3 atm is 8 L. If the gas is cooled at constant volume until the
pressure falls to 1.2 atm, then the gas is heated and expanded at constant
pressure (1.2 atm) until the volume is 20 L and the temperature is 292°
Kelvin, what is the overall work that has been done by the system? - --1.46
kJ (use the fomula w=-P/\V)
-What is Avogadro's number? - -AVOGRADO's number is defined as the
number of ATOMS in 12g of Carbon-12
-Which arrangement accurately describes the standard entropy values for
Na at different phases? - -Na (s) < Na (l) < Na (g
-What is the reducing agent in the following equation?
Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g) - -Mg
-
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