Portage Chemistry 103 Module 1 Exam
Study Questions with Accurate
Answers
Exponential Numbers - ANSWERS623000000. = larger than 1 = positive exponent,
move decimal 8 places = 6.23 x 10^8
Density Calculation - ANSWERSD (g/ml) = M(g) / V(ml)
Significant Figures Rules - ANSWERSAll non-zero digits are significant. Zeros between
or following non-zero numbers are significant. Zeros to the left of a decimal are not
significant.
Significant Figures in Calculations - ANSWERSIn addition/subtraction, round to fewest
decimal places. In multiplication/division, round to fewest significant figures.
Rounding Off Numbers - ANSWERSIf digit to drop > 5, increase last retained digit by 1.
If digit to drop < 5, keep last remaining digit. If digit to drop = 5, round based on
following digit.
Significant Figures Count - ANSWERS1.) 0.004035: 4 sig figs 2.) 306.2: 4 sig figs 3.)
20.70: 4 sig figs 4.) 0.3450: 4 sig figs 5.) 0.0231: 3 sig figs 6.) 45.670: 5 sig figs 7.)
0.00034: 2 sig figs
(5.625 + 8.15) x 2.34 + 3.2 = - ANSWERS35.4 (to tenths place)
7..390 + 1.53 - 2.810 = - ANSWERS1.87 (to hundredths place)
(12.5340 - 8.350) / 4.76 + 8.35 = - ANSWERS9.23 (to hundredths place)
Average of 0.1707, 0.1713, 0.1720, 0.1704, 0.1715 = - ANSWERS0.1712
5.) Calculate Volume - ANSWERS73.5 ml (3 sig figs)
6.) Calculate Density - ANSWERS3.1 g/ml (2 sig figs)
Element Symbol: ALUMINUM - ANSWERSAl
Element Symbol: ANTIMONY - ANSWERSSb
Element Symbol: ARGON - ANSWERSAr
, Element Symbol: ARSENIC - ANSWERSAs
Element Symbol: BARIUM - ANSWERSBa
Element Symbol: BERYLLIUM - ANSWERSBe
Element Symbol: BISMUTH - ANSWERSBi
Element Symbol: BORON - ANSWERSB
Bromine - ANSWERSSymbol: Br
Cadmium - ANSWERSSymbol: Cd
Calcium - ANSWERSSymbol: Ca
Carbon - ANSWERSSymbol: C
Chlorine - ANSWERSSymbol: Cl
Chromium - ANSWERSSymbol: Cr
Cobalt - ANSWERSSymbol: Co
Copper - ANSWERSSymbol: Cu
Fluorine - ANSWERSSymbol: F
Gold - ANSWERSSymbol: Au
Helium - ANSWERSSymbol: He
Hydrogen - ANSWERSSymbol: H
Iodine - ANSWERSSymbol: I
Iron - ANSWERSSymbol: Fe
Lead - ANSWERSSymbol: Pb
Lithium - ANSWERSSymbol: Li
Magnesium - ANSWERSSymbol: Mg
Manganese - ANSWERSSymbol: Mn
Study Questions with Accurate
Answers
Exponential Numbers - ANSWERS623000000. = larger than 1 = positive exponent,
move decimal 8 places = 6.23 x 10^8
Density Calculation - ANSWERSD (g/ml) = M(g) / V(ml)
Significant Figures Rules - ANSWERSAll non-zero digits are significant. Zeros between
or following non-zero numbers are significant. Zeros to the left of a decimal are not
significant.
Significant Figures in Calculations - ANSWERSIn addition/subtraction, round to fewest
decimal places. In multiplication/division, round to fewest significant figures.
Rounding Off Numbers - ANSWERSIf digit to drop > 5, increase last retained digit by 1.
If digit to drop < 5, keep last remaining digit. If digit to drop = 5, round based on
following digit.
Significant Figures Count - ANSWERS1.) 0.004035: 4 sig figs 2.) 306.2: 4 sig figs 3.)
20.70: 4 sig figs 4.) 0.3450: 4 sig figs 5.) 0.0231: 3 sig figs 6.) 45.670: 5 sig figs 7.)
0.00034: 2 sig figs
(5.625 + 8.15) x 2.34 + 3.2 = - ANSWERS35.4 (to tenths place)
7..390 + 1.53 - 2.810 = - ANSWERS1.87 (to hundredths place)
(12.5340 - 8.350) / 4.76 + 8.35 = - ANSWERS9.23 (to hundredths place)
Average of 0.1707, 0.1713, 0.1720, 0.1704, 0.1715 = - ANSWERS0.1712
5.) Calculate Volume - ANSWERS73.5 ml (3 sig figs)
6.) Calculate Density - ANSWERS3.1 g/ml (2 sig figs)
Element Symbol: ALUMINUM - ANSWERSAl
Element Symbol: ANTIMONY - ANSWERSSb
Element Symbol: ARGON - ANSWERSAr
, Element Symbol: ARSENIC - ANSWERSAs
Element Symbol: BARIUM - ANSWERSBa
Element Symbol: BERYLLIUM - ANSWERSBe
Element Symbol: BISMUTH - ANSWERSBi
Element Symbol: BORON - ANSWERSB
Bromine - ANSWERSSymbol: Br
Cadmium - ANSWERSSymbol: Cd
Calcium - ANSWERSSymbol: Ca
Carbon - ANSWERSSymbol: C
Chlorine - ANSWERSSymbol: Cl
Chromium - ANSWERSSymbol: Cr
Cobalt - ANSWERSSymbol: Co
Copper - ANSWERSSymbol: Cu
Fluorine - ANSWERSSymbol: F
Gold - ANSWERSSymbol: Au
Helium - ANSWERSSymbol: He
Hydrogen - ANSWERSSymbol: H
Iodine - ANSWERSSymbol: I
Iron - ANSWERSSymbol: Fe
Lead - ANSWERSSymbol: Pb
Lithium - ANSWERSSymbol: Li
Magnesium - ANSWERSSymbol: Mg
Manganese - ANSWERSSymbol: Mn
