CHM 111 Midterm Exam 112 Questions with Verified Answers,100% CORRECT
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Module
CHM 111
Institution
CHM 111
CHM 111 Midterm Exam 112 Questions with Verified Answers
The nucleus of an atom consists of
A. electrons and neutrons
B. electrons and protons
C. protons and neutrons
D. All of the above - CORRECT ANSWER C. protons and neutrons
Element - CORRECT ANSWER Basic or elementary substances that ...
CHM 111 Midterm Exam 112 Questions with Verified
Answers
The nucleus of an atom consists of
A. electrons and neutrons
B. electrons and protons
C. protons and neutrons
D. All of the above - CORRECT ANSWER C. protons and neutrons
Element - CORRECT ANSWER Basic or elementary substances that cannot be
decomposed into simpler substances
Compound - CORRECT ANSWER A substance with a constant composition that can be
broken down into its elements by chemical processes
Solution - CORRECT ANSWER A homogeneous mixture of two or more substances
Physical change - CORRECT ANSWER Matter does not change its composition.
Chemical change - CORRECT ANSWER A substance that is transformed into a
chemically different substance.
Law of conservation of mass - CORRECT ANSWER Matter is not created nor destroyed
in any chemical or physical change
Intensive properties - CORRECT ANSWER They are independent of the amount of
matter examined and are used to identify substances.
Extensive properties - CORRECT ANSWER Relate to the amount of substance present.
Precision - CORRECT ANSWER Indicates how closely different measurements of a
quantity agree with one another.
Accuracy - CORRECT ANSWER Indicates how well a measurement agrees with the
accepted or "true" value.
Isotopes - CORRECT ANSWER Atoms that have the same number of protons but
different numbers of neutrons
Stoichiometry - CORRECT ANSWER The quantitative study of reactants and products
in a chemical reaction
, The mole - CORRECT ANSWER The SI base unit used to measure the amount of a
substance
Avogadro's number - CORRECT ANSWER 6.02 x 10^23. The number of particles in
exactly one mole of a pure substance
Limiting reactant - CORRECT ANSWER The substance that controls the quantity of
product that can form in a chemical reaction
The Heisenberg Principle states that _____________.
(a) no two electrons in the same atom can have the same set of four quantum numbers.
(b) two atoms of the same element must have the same number of protons.
(c) it is impossible to determine accurately both the position and momentum of an
electron simultaneously.
(d) electrons of atoms in their ground states enter energetically equivalent sets of
orbitals singly before they pair up in any orbital of the set.
(e) charged atoms (ions) must generate a magnetic field when they are in motion. -
CORRECT ANSWER (c) it is impossible to determine accurately both the position and
momentum of an electron simultaneously.
Rutherford carried out experiments in which a beam of alpha particles was directed at a
thin piece of metal foil. From these experiments he concluded that:
(a) electrons are massive particles.
(b) the positively charged parts of atoms are moving about with a velocity approaching
the speed of light.
(c) the positively charged parts of atoms are extremely small and extremely heavy
particles.
(d) the diameter of an electron is approximately equal to that of the nucleus.
(e) electrons travel in circular orbits around the nucleus. - CORRECT ANSWER (c) the
positively charged parts of atoms are extremely small and extremely heavy particles.
Temperature Conversion
˚C = 5/9 x (˚F- 32)
˚F = (9/5 ˚C) + 32
9/5 = 1.8 and 5/9 ≈ .55
a. 73°F
b. 6°C - CORRECT ANSWER a. 22.8° C
b. 42.8° F
Convert
a) 55 miles per hour to cm per second
b) 1.00 ft2 to cm2
c) 25 g of carbon to moles of carbon - CORRECT ANSWER a) 2458.72 cm/s
b) 929.03 cm2
c) 2.08 moles
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