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Chem Final (Straighterline) [C] Questions and Answers 2024
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Chem Final (Straighterline) [C]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
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 - answer2:1:1:2
Which of the following isotopes is likely to be the most stable? - answerSn-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? - answer-1.46 kJ (use the fomula w=-P/\V)
What is Avogadro's number? - answerAVOGRADO'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? - answerNa (s) < Na (l) < Na (g
What is the reducing agent in the following equation?
Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g) - answerMg
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