CHEM 210 PRACTICE PROBLEMS ALL
CHAPTERS QUESTIONS AND ANSWERS
WITH ACCURATE SOLUTIONS / LATEST
UPDATED VESIONS
For each of the following quantities, underline the zeros that are significant figures, and
determine the number of significant figures in each quantity. - CORRECT ANSWES --
a. 0.0030 L
b. 0.1044 g
c. 53,069 mL
d. 0.00004715 m
e. 57,600 s
f. 0.0000007160 cm^3
Multiply the following numbers:
9.2 cm x 6.8 cm x 0.3744 cm - CORRECT ANSWES -- 23.4225 cm^3 = 23 cm^3
add the two volumes:
83.5 + 23.28 - CORRECT ANSWES -- 106.78 mL = 106.8 mL
subtract the two volumes:
865.9 mL - 2.8121 mL - CORRECT ANSWES -- 863.0879 mL = 863.1 mL
The height of Angel Falls is 3,212 ft. Express this quantity in miles (mi) if 1 mi = 5,280 ft
- CORRECT ANSWES -- 3212 ft x 1 mi/5,280 ft = 0.6083 mi
Write the atomic symbols for atoms with the following subatomic particles:
a.) 8 protons, 8 neutrons, 8 electrons
b.) 17 protons, 20 neutrons, 17 electrons
c.) 47 protons, 60 neutrons, 47 electrons - CORRECT ANSWES -- 16 O 8
37 Cl 17
107 Ag 47
Which of the following pairs are isotopes of the same element?
a.) 15 X 8 and 15 X 7
b.) 12 X 6 and 14 X 6
c.) 15 X 7 and 16 X 8 - CORRECT ANSWES -- B
using the periodic table, specify the atomic mass of each element:
a.) calcium
b.) aluminum
c.) lead
, d.) barium
e.) iron - CORRECT ANSWES -- a.) 40.08 amu
b.) 26.98 amu
c.) 207.2 amu
d.) 137.3 amu
e.) 55.85 amu
Cl has a mass of 34.97 amu (75.76%), and C has a mass of 36.97 amu (24.24%). Use
the atomic mass and percent of each isotope to calculate the weighted average. -
CORRECT ANSWES -- 34.97 amu x 75.75/100 = 26.49 amu
35.97 amu x 24.24/100 = 8.962 amu
35.45 amu
Name the ionic compound formed from each of the following pairs of elements:
a.) magnesium and nitrogen
b.) iodine and cadmium
c.) strontium and fluorine
d.) sulfur and cesium - CORRECT ANSWES -- a.) magnesium nitride
b.) cadmium iodide
c.) strontium fluoride
d.) cesium sulfide
Write empirical formulas for each of the compounds named:
a.) magnesium nitride
b.) cadmium iodide
c.) strontium fluoride
d.) cesium sulfide - CORRECT ANSWES -- a.) Mg3N2
b.) Cdi2
c.) SrF2
d.) CsS2
Given the systematic name for each formula or the formula for each name for the
following compounds:
a.) tin (II) fluoride
b.) CrI3
c.) ferric oxide
d.) CoS - CORRECT ANSWES -- a.) SnF2
b.) chromium (III) iodide
c.) Fe2o3
d.) cobalt (II) sulfide
Given the systematic name for each formula or the formula for each name for the
following compounds:
a.) Fe(ClO4)2
b.) sodium sulfide
CHAPTERS QUESTIONS AND ANSWERS
WITH ACCURATE SOLUTIONS / LATEST
UPDATED VESIONS
For each of the following quantities, underline the zeros that are significant figures, and
determine the number of significant figures in each quantity. - CORRECT ANSWES --
a. 0.0030 L
b. 0.1044 g
c. 53,069 mL
d. 0.00004715 m
e. 57,600 s
f. 0.0000007160 cm^3
Multiply the following numbers:
9.2 cm x 6.8 cm x 0.3744 cm - CORRECT ANSWES -- 23.4225 cm^3 = 23 cm^3
add the two volumes:
83.5 + 23.28 - CORRECT ANSWES -- 106.78 mL = 106.8 mL
subtract the two volumes:
865.9 mL - 2.8121 mL - CORRECT ANSWES -- 863.0879 mL = 863.1 mL
The height of Angel Falls is 3,212 ft. Express this quantity in miles (mi) if 1 mi = 5,280 ft
- CORRECT ANSWES -- 3212 ft x 1 mi/5,280 ft = 0.6083 mi
Write the atomic symbols for atoms with the following subatomic particles:
a.) 8 protons, 8 neutrons, 8 electrons
b.) 17 protons, 20 neutrons, 17 electrons
c.) 47 protons, 60 neutrons, 47 electrons - CORRECT ANSWES -- 16 O 8
37 Cl 17
107 Ag 47
Which of the following pairs are isotopes of the same element?
a.) 15 X 8 and 15 X 7
b.) 12 X 6 and 14 X 6
c.) 15 X 7 and 16 X 8 - CORRECT ANSWES -- B
using the periodic table, specify the atomic mass of each element:
a.) calcium
b.) aluminum
c.) lead
, d.) barium
e.) iron - CORRECT ANSWES -- a.) 40.08 amu
b.) 26.98 amu
c.) 207.2 amu
d.) 137.3 amu
e.) 55.85 amu
Cl has a mass of 34.97 amu (75.76%), and C has a mass of 36.97 amu (24.24%). Use
the atomic mass and percent of each isotope to calculate the weighted average. -
CORRECT ANSWES -- 34.97 amu x 75.75/100 = 26.49 amu
35.97 amu x 24.24/100 = 8.962 amu
35.45 amu
Name the ionic compound formed from each of the following pairs of elements:
a.) magnesium and nitrogen
b.) iodine and cadmium
c.) strontium and fluorine
d.) sulfur and cesium - CORRECT ANSWES -- a.) magnesium nitride
b.) cadmium iodide
c.) strontium fluoride
d.) cesium sulfide
Write empirical formulas for each of the compounds named:
a.) magnesium nitride
b.) cadmium iodide
c.) strontium fluoride
d.) cesium sulfide - CORRECT ANSWES -- a.) Mg3N2
b.) Cdi2
c.) SrF2
d.) CsS2
Given the systematic name for each formula or the formula for each name for the
following compounds:
a.) tin (II) fluoride
b.) CrI3
c.) ferric oxide
d.) CoS - CORRECT ANSWES -- a.) SnF2
b.) chromium (III) iodide
c.) Fe2o3
d.) cobalt (II) sulfide
Given the systematic name for each formula or the formula for each name for the
following compounds:
a.) Fe(ClO4)2
b.) sodium sulfide
