Chem Final (Straighterline) [C] Solved
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
How is the mass number of an element different from its atomic number? - ANSWER-
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? -
ANSWER-p
Plants use up copious amounts of which alkali metal, preventing most of it from being
washed out to sea? - ANSWER-potassium
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? - ANSWER--1.46 kJ (use the fomula w=-P/\V)
What is Avogadro's number? - ANSWER-AVOGRADO's number is defined as the
number of ATOMS in 12g of Carbon-12
What is the ratio of reactants and products in the chemical equation?
__NaOH + __H2SO4 -> __Na2SO4 + __H2O - ANSWER-2:1:1:2
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 for Na at different
phases? - ANSWER-Na (s) < Na (l) < Na (g
Which of the following isotopes is likely to be the most stable? - ANSWER-Sn-50
(because the most stable ones are 2,8,20,50,82 or 126 protons)
