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CHEM 111 Practice Test with
CHEM 111 Practice Test with Questions & CORRECT Verified ANSWERS
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CHEM 111 Practice Test with Questions &CORRECT Verified ANSWERS |
Which one of the following compounds is copper(I) chloride? - ✔✔CuCl
The atomic number of an atom of 130Xe is ________. - ✔✔54
Which of the following compounds would you expect to be ionic? - ✔✔KCl
The element X has three naturally occurring isotopes. The masses (amu) and % abundances of
the isotopes are given in the table below. The average atomic mass of the element is ________
amu.
isotope abund mass
221x 74.22 220.9
220x 12.78 220.0
218x 13.00 218.1 - ✔✔220.4
________ and ________ reside in the atomic nucleus. - ✔✔Protons, neutrons
The element X has three naturally occurring isotopes. The masses (amu) and % abundances of
the isotopes are given in the table below. The average atomic mass of the element is ________
amu.
Isotope abund mass
221x 82.900 220.90
220x 13.200 220.00
,218x 3.9000 218.10 - ✔✔220.67
Magnesium and sulfur form an ionic compound with the formula ________. - ✔✔MgS
Fluorine forms an ion with a charge of ________. - ✔✔1-
Which pair of atoms constitutes a pair of isotopes of the same element? - ✔✔14/6 X 12/6
In the symbol below, x is ________.
x6C - ✔✔mass number
Potassium is a ________ and chlorine is a ________. - ✔✔metal, nonmetal
What is the molecular formula for heptane? - ✔✔C7H16
The formula of a salt is XCl2. The X-ion in this salt has 26 electrons. The metal X is ________. -
✔✔Ni
The proper formula for the hydronium ion is ________. - ✔✔H3O+
Which species has 48 electrons? - ✔✔118/50 Sn^+2
What is the molecular formula for octane? - ✔✔c8h18
Which of these changes are physical and which are chemical? - ✔✔Physical - water vapor in
the air forms frost.
A goldsmith melts gold and pulls into wire.
, Chemical - plants make sure from Co2 and h2o
Which statement describes a physical change? - ✔✔Liquid water evaporates.
students determine the percentage of lead in a sample as a laboratory exercise. The true
percentage is 22.52%. The students' results for three determinations are as follows:
1. 22.52, 22.48, 22.54
2. 22.64, 22.58, 22.62 - ✔✔
Calculate the average percentage for the first set of data. - ✔✔22.51
Calculate the average percentage for the second set of data - ✔✔22.61
Tell which set is the more accurate based on the average. - ✔✔first
Precision can be judged by examining the average of the deviations from the average value for
that data set. Calculate the average value of the absolute deviations of each measurement from
the average for the first set. - ✔✔2x10^-10
Calculate the average value of the absolute deviations of each measurement from the average
for the second set. - ✔✔2x10^-2
Which set is more precise? - ✔✔both
How many milliliters of coconut oil weigh 4.71 grams if the density of coconut oil is 0.925
g/cm3? - ✔✔5.09 mL
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