CHEM 103 Final Exam Questions and
Accurate Detailed Answers
quantitative observations are not: - Answer: descriptive in nature
(T or F) all measurements consist of two parts: numerical values and optional units. - Answer: false
(T or F) numerical values reflect the precision of the measurement. - Answer: true
reliability of measurements is based on - Answer: precision, accuracy, and uncertainty
density - Answer: is defined as mass/volume
Mercury (Hg) has a density of 13.6 g/cm3. what is the mass for 56 ml of mercury? - Answer: 760g
hydrates - Answer: are ionic compounds
CaSO4 + 1/2 H2O is called - Answer: calcium sulfate hydrate
percent error is calculated with the following formula: - Answer: = (actual - experimental) x
100/experimental
BaCl2 ∙6 H2O is called - Answer: barium chloride hexahydrate
When heating the hydrate to remove the water - Answer: The crucible must be heated until it is a
constant weight
carbonates and bicarbonates - Answer: react to produce carbonic acid that decomposed to CO2 and
H2O
A reaction mixture [2 Mg(s) + O2(g) à 2 MgO(s)] contains 38.6 g Mg and 53.2 g O2. What is the
limiting reactant? - Answer: magnesium
Accurate Detailed Answers
quantitative observations are not: - Answer: descriptive in nature
(T or F) all measurements consist of two parts: numerical values and optional units. - Answer: false
(T or F) numerical values reflect the precision of the measurement. - Answer: true
reliability of measurements is based on - Answer: precision, accuracy, and uncertainty
density - Answer: is defined as mass/volume
Mercury (Hg) has a density of 13.6 g/cm3. what is the mass for 56 ml of mercury? - Answer: 760g
hydrates - Answer: are ionic compounds
CaSO4 + 1/2 H2O is called - Answer: calcium sulfate hydrate
percent error is calculated with the following formula: - Answer: = (actual - experimental) x
100/experimental
BaCl2 ∙6 H2O is called - Answer: barium chloride hexahydrate
When heating the hydrate to remove the water - Answer: The crucible must be heated until it is a
constant weight
carbonates and bicarbonates - Answer: react to produce carbonic acid that decomposed to CO2 and
H2O
A reaction mixture [2 Mg(s) + O2(g) à 2 MgO(s)] contains 38.6 g Mg and 53.2 g O2. What is the
limiting reactant? - Answer: magnesium
