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A set of questions and answers for a chemistry 101 final exam at ivy tech community college. The exam covers a wide range of topics in general chemistry, including atomic structure, chemical bonding, stoichiometry, thermochemistry, gas laws, and solutions. The questions test the student's understanding of fundamental chemical concepts and their ability to apply them to solve problems. Detailed explanations for the correct answers, making it a valuable resource for students preparing for a similar exam or reviewing the key concepts in general chemistry. The comprehensive nature of the exam and the level of detail in the answers suggest that this document could be useful as study notes, lecture notes, or a summary for a university-level general chemistry course.
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What is the mass percent of hydrogen in water? a: 5. b: 11. c: 33. d: 88.8 - - - correct answer ✅b How many atoms are in 5.80 moles of He? a: 3.49 × 10^ b: 6.02 × 10^ c: 1.03 × 10^ d: 4.00 - - - correct answer ✅a What is the value of n when the empirical formula is C3H5 and the molecular mass is 205.4 g/mol? a: 10 b: 0. c: 140
d: 5 - - - correct answer ✅d How many atoms are in 15.6 grams of silicon? a: 0. b: 3.34 × 10^ c: 2.64 × 10^ d: 438 - - - correct answer ✅b What is the correct value for Avogadro's number? a: 6.022 × 10^2. b: 6.022 × 10^ c: 6.022 × 10^ d: 6.023 × 10^22 - - - correct answer ✅c The empirical formula for C6H6 is C3H3. True False - - - correct answer ✅False
b: 48. c: 51. d: 93.7 - - - correct answer ✅b What is the mass of 0.560 moles of chlorine gas? a: 19. b: 39. c: 127 d: 63.3 - - - correct answer ✅b How many molecules of nitrogen monoxide are in a 22.5 gram sample? a: 4.51 × 10^ b: 7.33 × 10^ c: 4.06 × 10^ d: 5.86 × 10^23 - - - correct answer ✅a How many molecules of sulfur trioxide are in 78.0 grams?
a: 5.87 × 10^ b: 7.33 × 10^ c: 0. d: 3.76 × 10^27 - - - correct answer ✅a In comparing 1 mole of carbon atoms to one mole of magnesium atoms, which statement is TRUE? a: The mass of 1 mole of carbon is the same as the mass of 1 mole of magnesium. b: The mass of 1 mole of carbon is greater than the mass of 1 mole of magnesium. c: There are more atoms in 1 mole of magnesium than in 1 mole of carbon. d: The mass of 1 mole of magnesium is greater than the mass of 1 mole of carbon. - - - correct answer ✅d One mole of zinc contains 65.39 zinc atoms. True
True False - - - correct answer ✅False What are the coefficients for the following reaction when it is properly balanced? ___O2 + ___CH4 → ___CO2 + ___H2O a: 1, 3, 2, 1 b: 2, 1, 3, 1 c: 2, 3, 2, 2 d: 2, 1, 1, 2 - - - correct answer ✅d What are the coefficients for the following reaction when it is properly balanced? ___HCl + ___Mg → ___MgCl2 + ___H a: 2, 1, 1, 3 b: 6, 1, 3, 2 c: 2, 3, 1, 6 d: 2, 3, 6, 1 - - - correct answer ✅d
What type of reaction is the generic equation A + B -> AB? a: synthesis/combination b: decomposition c: single displacement d: double-displacement - - - correct answer ✅a When the equation __NO2 + __H2O + __O2 → __HNO3 is balanced, the coefficient of HNO3 is: a: 2 b: 5 c: 3 d: 4 - - - correct answer ✅d The following equation IS balanced: CH4 + 2O2 → CO2 + H2O True False - - - correct answer ✅False
True False - - - correct answer ✅True Which is a spectator ion from the following complete ionic equation: H+(aq) + Br-(aq) + K+ (aq) + OH-(aq) → H2O(l) + K+(aq) + Br- (aq) a: OH- b: H+ c: K+ d: H2O - - - correct answer ✅c What are the coefficients for the following reaction when it is properly balanced? ___Na3PO4 + ___Ba(NO3)2 → ___NaNO3 + ___Ba3(PO4) a: 2, 1, 1, 3 b: 6, 1, 3, 2 c: 2, 3, 1, 6 d: 2, 3, 6, 1 - - - correct answer ✅d
Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) What is the correct complete ionic equation? a: Pb2+ + (NO3)2- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3- b: Pb2+ + 2NO3- + 2K+ + 2I- → Pb2+ + 2I- + 2K+ + 2NO3- c: Pb2+ + 2NO3- +2K+ + I- → PbI2(s) + 2K+ + NO3- d: Pb2+ + 2NO3- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3- - - - correct answer ✅d What type of reaction is the generic equation AB + CD= AD + CB? a: synthesis/combination b: decomposition c: single displacement d: double-displacement - - - correct answer ✅d We remove the spectator ions from the complete ionic equation to form the net ionic equation. True
False - - - correct answer ✅True The limiting reactant is not necessarily the reactant with the least mass. True False - - - correct answer ✅True Stoichiometry is a chemist's version of following a recipe. True False - - - correct answer ✅True The actual yield is the same as the theoretical yield if the reaction goes to completion and there is no loss of product. True False - - - correct answer ✅True The limiting reactant determines what the actual yield is. True
False - - - correct answer ✅False How many eggs are needed to make 1 dozen waffles, assuming you have enough of all other ingredients? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles a: 12 b: 16 c: 48 d: 9 - - - correct answer ✅d Diatomic O2 can react with the element magnesium to form magnesium oxide (MgO). The balanced chemical equation is: O2+2Mg->2MgO If 4 moles of magnesium totally reacted with more than enough O2, how many moles of MgO would be expected to form? a: 2 b: 1 c: 4 d: 8 - - - correct answer ✅c
How many grams of aluminum oxide are produced according to the reaction below given that you start with 10.0 grams of Al and 19. grams of O2? Reaction: 4Al + 3O2 → 2Al2O a: 5. b: 0. c: 18. d: 40.4 - - - correct answer ✅c When viewing a chemical equation, the limiting reactant can never be a chemical on the product side of the equation. True False - - - correct answer ✅True The limiting reactant is the reactant that produces the maximum amount of product. True False - - - correct answer ✅False
The conversion factor between mass and moles for a compound is the molar mass. True False - - - correct answer ✅True The limiting reactant determines what the actual yield is. True False - - - correct answer ✅False Given the recipe: 2 cups flour + 1 egg + 3 oz blueberries → 4 muffins. You can make 9 muffins from 3.5 cups of flour. True False - - - correct answer ✅False How many moles of aluminum oxide are produced according to the reaction below given that you start with 10.0 grams of Al and 19. grams of O2? Reaction: 4Al + 3O2 → 2Al2O
c: 4. d: 9.5 - - - correct answer ✅d What is the final volume of a balloon that was initially 500.0 mL at 25°C and was then heated to 50°C? a: 1.00L b: 193mL c: 542mL d: 461mL - - - correct answer ✅c The initial volume of a gas cylinder is 750.0 mL. If the pressure of a gas inside the cylinder changes from 840 mmHG to 360 mmHg , what is the final volume the gas occupies? a: 321.4 mL b: 630.0 mL c: 1.750 L d: 3.151 L - - - correct answer ✅c
What is the initial temperature (°C) of a system that has the pressure decreased by 10 times while the volume increased by 5 times with a final temperature of 150K? a: 75 b: 300 c: 198 d: 27 - - - correct answer ✅d Gas particles act independently of each other. True False - - - correct answer ✅True The main component of the air we breathe is oxygen gas. True False - - - correct answer ✅False Gases fill the entire volume of their container.
