CHEM 103 Final Exam Questions with Correct Answer1

CHEM 103 Final Exam Questions with Correct
Answers
quantitative observations are not: Correct Answer-descriptive in nature


(T or F) all measurements consist of two parts: numerical values and
optional units. Correct Answer-false


(T or F) numerical values reflect the precision of the measurement.
Correct Answer-true


reliability of measurements is based on Correct Answer-precision,
accuracy, and uncertainty


density Correct 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? Correct Answer-760g


hydrates Correct Answer-are ionic compounds


CaSO4 + 1/2 H2O is called Correct Answer-calcium sulfate hydrate


percent error is calculated with the following formula: Correct Answer-=
(actual - experimental) x 100/experimental

, BaCl2 ∙6 H2O is called Correct Answer-barium chloride hexahydrate


When heating the hydrate to remove the water Correct Answer-The
crucible must be heated until it is a constant weight


carbonates and bicarbonates Correct 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? Correct Answer-
magnesium


A reaction mixture [2 Mg(s) + O2(g) --> 2 MgO(s)] contains 38.6 g Mg
and 53.2 g O2. What is the theoretical yield of MgO? Correct Answer-
64.1 g


A reaction mixture [2 Mg(s) + O2(g) --> 2 MgO(s)] contains 38.6 g Mg
and 53.2 g O2. The reaction yielded 56.4 g of product. What is the
percent yield of MgO? Correct Answer-88.0%


(T or F) It doesn't matter how much acid is added to the crucible in the
lab, as long as it does not overflow the container. Correct Answer-true