Chemistry
59) How many moles of NH3 can be produced by the reaction of 2.00 g of N2 with 3.00 g H2? Reaction: N2(g) + 3 H2(g) → 2 NH3(g) A) 0.143 B) 0.0567 C) 0.235 D) 1.00 E) none of the above
A) 0.143
68) Consider the reaction: 2 Al + 3Br2 → 2 AlBr3 Suppose a reaction vessel initially contains 5.0 mole Al and 6.0 mole Br2. What is in the reaction vessel once the reaction has occurred to the fullest extent possible? A) 1.0 mole Al; 0 mole Br2; 4.0 mole AlBr3 B) 0 mole Al; 0 mole Br2; 11.0 mole AlBr3 C) 2.0 mole Al; 3.0 mole Br2; 2.0 mole AlBr3 D) 0 mole Al; 1.0 mole Br2; 4.0 mole AlBr3 E) none of the above
A) 1.0 mole Al; 0 mole Br2; 4.0 mole AlBr3
70) Consider the following reaction: 2 Mg + O2 → 2 MgO △H rxn = -1203 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 4 moles of Mg. A) -1203 kJ B) -2406 kJ C) -601.5 kJ D) -4812 kJ E) none of the above
B) -2406 kJ
53) How many moles of aluminum oxide are produced according to the reaction below given that you start with 10.0 grams of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 → 2Al2O3 A) 0.396 B) 0.185 C) 0.741 D) 5.00 E) not enough information
B) 0.185
41) What is the excess reactant for the following reaction given we have 3.4 moles of Ca(NO3)2 and 2.4 moles of Li3PO4? Reaction: 3Ca(NO3)2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4)2 A) Ca(NO3)2 B) Li3PO4 C) LiNO3 D) Ca3(PO4)2 E) not enough information
B) Li3PO4
52) What is the excess reactant for the reaction below given that you start with 10.0 grams of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 → 2Al2O3 A) Al B) O2 C) Al2O3 D) both Al and O2 E) not enough information
B) O2
50) What is the limiting reactant for the reaction below given that you start with 2.50 grams C and 2.50 grams SiO2? Reaction: C + SiO2 → SiC + O2 A) C B) SiO2 C) SiC D) O2 E) There is no limiting reactant.
B) SiO2
33) Consider the following generic chemical equation: 2W + 3X → 3Y + Z When 5 units of W and 6 units of X are allowed to react, the limiting reactant would be: A) W B) X C) Y D) Z E) There is no limiting reactant in this situation.
B) X
7) Starting with 156 g Li2O and 33.3 g H2O, decide which reactant is present in limiting quantities. Given: Li2O + H2O → 2 LiOH A) lithium oxide B) water C) lithium hydroxide D) insufficient data E) none of the above
B) water
3) The primary cause of increasing greenhouse gases is: A) the burning of vast amounts of rain forests. B) the production of CO2 by respiration. C) the increased use of natural gas, petroleum and coal. D) the release of CO2 by decreasing solubility in the ocean. E) none of the above
C) the increased use of natural gas, petroleum and coal.
71) Consider the following equation: CO + 2 H2 → CH3OH △H rxn = -128 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 8.08 g H2. A) -1024 kJ B) -1034 kJ C) -256 kJ D) -512 kJ E) none of the above
C) -256 kJ
47) How many moles of calcium chloride are theoretically produced for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)2? Reaction: 2HCl + Ca(OH)2 → 2H2O + CaCl2 A) 0.7 B) 1.0 C) 1.4 D) 1.3 E) not enough information
D) 1.3
20) How many grams of sodium metal are needed to make 29.3 grams of sodium chloride? Given the reaction: 2Na + Cl2 → 2NaCl A) 46.0 B) 5.75 C) 23.0 D) 11.5 E) not enough information
D) 11.5
61) A 24.0 g sample of nitrogen gas reacts with an excess of hydrogen gas to give an actual yield of 3.85 g NH3. What is the percent yield for this reaction? Reaction: N2(g) + 3 H2(g) → 2 NH3(g) A) 86.8% B) 73.6% C) 26.4% D) 13.2% E) none of the above
D) 13.2%
26) Which of the following statements is false? A) The limiting reactant is completely consumed in a chemical reaction. B) The theoretical yield is the amount of product that can be made based on the amount of limiting reagent. C) The actual yield is the amount of product actually produced by a chemical reaction. D) The percent yield = × 100%. E) All of the above are true statements.
E) All of the above are true statements.
1) Greenhouse gases affect the temperature of the earth by blocking sunlight from reaching earth.
false
10) Given the reaction: 2 Na(s) + Cl2(g) → 2 NaCl(s) The conversion factor for chlorine gas to sodium metal is: 2 mol Cl ≡ 2 mol Na
false
11) Given the reaction: 2 Na(s) + Cl2(g) → 2 NaCl(s) The conversion factor for chlorine gas to sodium chloride is: 1 mol Cl2 ≡ 2 mol NaCl
true
13) Before determining conversion factors, it is necessary to make sure the equation is properly balanced.
true
14) The conversion factor between mass and moles for a compound is the molar mass.
true
28) What is the theoretical yield of waffles if you have 5 cups of flour, 9 eggs and 3 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles A) 10 B) 12 C) 6 D) 4 E) not enough information
A) 10
57) The reaction for the oxidation of NH3 is given as: 4 NH3 + 5 O2 → 4 NO + 6 H2O Under certain conditions the reaction will proceed at 29.8% yield of NO. How many grams of NH3 must be made to react with excess oxygen to yield 70.5 g of NO? A) 134 B) 237 C) 21.0 D) 2.37 E) none of the above
A) 134
18) How many grams of water are made from the reaction of 16.0 grams of oxygen gas? Given the reaction: 2H2 + O2 → 2H2O A) 18 B) 9 C) 36 D) 16 E) not enough information
A) 18
16) Given the balanced equation CH4 + 2 O2 → CO2 + 2 H2O, which of the following is NOT a correct conversion factor? A) 2 mole H2O = 18.02 g B) 1 mole O2 = 32.00 g C) 1 mole CH4 = 2 mole H2O D) 2 mole O2 = 1 mole CO2 E) none of the above
A) 2 mole H2O = 18.02 g
5) If the theoretical yield of the reaction below corresponds to 25.3 g and the percent yield of the reaction is known to be reproducibly 81.1%, calculate the actual yield. Given: Li2O + H2O → 2 LiOH A) 20.5 g B) 48.9 g C) 45.8 g D) 81.1 g E) none of the above
A) 20.5 g
39) What is the theoretical yield of a reaction if 25.0 grams of product were actually produced from a reaction that has a 88% yield? A) 28.4 B) 22.0 C) 3.52 D) 352 E) none of the above
A) 28.4
9) How many moles of water are made from complete reaction of 2.2 moles of oxygen gas with hydrogen gas? Given the reaction: 2H2 + O2 → 2H2O A) 4.4 B) 1.1 C) 2.2 D) 3.3 E) not enough information
A) 4.4
19) How many grams of chlorine gas are needed to make 117 grams of sodium chloride? Given the reaction: 2Na + Cl2 → 2NaCl A) 71.0 B) 142 C) 35.5 D) 48.2 E) not enough information
A) 71.0
6) Consider a reaction of chemicals depicted as A + B → C + D. Suppose reaction of 17.8 grams of A with 29.5 grams of B gave 24.7 grams of C. However, the theoretical yield of C for this reaction was 33.3 grams. What was the percent yield of chemical C? A) 74.2 B) 47.3 C) 11.7 D) 135 E) none of the above
A) 74.2
51) What is the limiting reactant for the reaction below given that you start with 10.0 grams of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 → 2Al2O3 A) Al B) O2 C) Al2O3 D) both Al and O2 E) not enough information
A) Al
40) What is the limiting reactant for the following reaction given we have 3.4 moles of Ca(NO3)2 and 2.4 moles of Li3PO4? Reaction: 3Ca(NO3)2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4)2 A) Ca(NO3)2 B) Li3PO4 C) LiNO3 D) Ca3(PO4)2 E) not enough information
A) Ca(NO3)2
46) What is the excess reactant for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)2? Reaction: 2HCl + Ca(OH)2 → 2H2O + CaCl2 A) Ca(OH)2 B) HCl C) H2O D) CaCl2 E) not enough information
A) Ca(OH)2
62) Which is the excess reactant in the following reaction given that you start with 15.5 g of Na2S and 12.1 g CuSO4? Reaction: Na2S + CuSO4 → Na2SO4 + CuS A) Na2S B) CuSO4 C) Na2SO4 D) CuS E) not enough information
A) Na2S
27) Which ingredient is the limiting reactant if you have 5 cups of flour, 9 eggs and 3 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles A) flour B) eggs C) oil D) waffles E) not enough information
A) flour
13) How many moles of chlorine gas are needed to make 0.6 moles of sodium chloride? Given the reaction: 2Na + Cl2 → 2NaCl A) 0.6 B) 0.3 C) 1.2 D) 3.6 E) not enough information
B) 0.3
58) How many grams of the excess reactant are left over according to the reaction below given that you start with 10.0 g of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 → 2Al2O3 A) 8.90 B) 10.1 C) 1.1 D) 14.6 E) not enough information
B) 10.1
3) How many grams of water are needed to react with 27.2 grams of O? Given: Li2O + H2O → 2 LiOH A) 0.910 B) 16.4 C) 1.51 D) 38.94 E) none of the above
B) 16.4
60) Calculate the maximum number of grams of NH3 that can be produced by the reaction of 2.00 g of N2 with 3.00 g H2. Reaction: N2(g) + 3 H2(g) → 2 NH3(g) A) 0.964 B) 2.43 C) 4.00 D) 17.0 E) none of the above
B) 2.43
21) Given that 4 NH3 + 5 O2 → 4 NO + 6 H2O, when 4.50 mol of H2O are formed, the amount of NO formed is: A) 1.50 mol. B) 3.00 mol. C) 4.50 mol. D) 6.75 mol. E) none of the above
B) 3.00 mol.
56) A sample of 8.5 g NH3 on oxidation produces 4.5 g of NO. Calculate the percent yield. Reaction: 4 NH3 + 5 O2 → 4 NO + 6 H2O A) 15 % B) 30% C) 60% D) 70% E) none of the above
B) 30%
44) How many grams of NO2 are theoretically produced if we start with 1.20 moles of S and 9.90 moles of HNO3? Reaction: S + 6HNO3 → H2SO4 + 6NO2 + 2H2O A) 7.20 B) 331 C) 455 D) 786 E) not enough information
B) 331
66) What is the percent yield of CuS for the following reaction given that you start with 15.5 g of Na2S and 12.1 g CuSO4? The actual amount of CuS produced was 3.05. Reaction: Na2S + CuSO4 → Na2SO4 + CuS A) 16.1% B) 42.1% C) 18.93% D) 7.25% E) not enough information
B) 42.1%
38) The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0g. What is the percent yield? A) 75.0 B) 56.0 C) 31.5 D) 178 E) none of the above
B) 56.0
42) How many moles of lithium nitrate are theoretically produced if we start with 3.4 moles of Ca(NO3)2 and 2.4 moles of Li3PO4? Reaction: 3Ca(NO3)2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4)2 A) 7.2 B) 6.8 C) 1.2 D) 1.1 E) not enough information
B) 6.8
6) 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) 48 B) 9 C) 12 D) 16 E) not enough information
B) 9
63) Which is the limiting reactant in the following reaction given that you start with 15.5 g of Na2S and 12.1 g CuSO4? Reaction: Na2S + CuSO4 → Na2SO4 + CuS A) Na2S B) CuSO4 C) Na2SO4 D) CuS E) not enough information
B) CuSO4
45) What is the limiting reactant for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)2? Reaction: 2HCl + Ca(OH)2 → 2H2O + CaCl2 A) Ca(OH)2 B) HCl C) H2O D) CaCl2 E) not enough information
B) HCl
24) Many metals react with halogens to give metal halides. For example, 2 Al (s) + 3 Cl2(g) → 2 AlCl3 (s) If you begin with 13.5 g of aluminum: A) you will need 23.6 g Cl2 for complete reaction and will produce 66.7 g of AlCl3. B) you will need 53.2 g Cl2 for complete reaction and will produce 66.7 g of AlCl3. C) you will need 26.6 g Cl2 for complete reaction and will produce 49.0 g of AlCl3. D) you will need 11.8 g Cl2 for complete reaction and will produce 49.0 g of AlCl3. E) none of the above
B) you will need 53.2 g Cl2 for complete reaction and will produce 66.7 g of AlCl3.
8) Hydrochloric acid reacts with barium hydroxide according to the equation: 2 HCl (aq) + Ba(OH)2 (aq) > BaCl2 (aq) + 1H2O (l) H= -118 kj Calculate the heat (in kJ) associated with the complete reaction of 18.2 grams of HCl (aq). A) -58.9 B) +58.9 C) -29.5 D) -236 E) none of the above
C) -29.5
10) How many moles of water are made from complete reaction of 1.4 moles of hydrogen gas? Given the reaction: 2H2 + O2 → 2H2O A) 2.8 B) 0.7 C) 1.4 D) 2.1 E) not enough information
C) 1.4
25) A chemist wishes to perform the following reaction: N2 + 3 H2 → 2 NH3 If only 14.0 g of N2 is available, what is the minimum amount, in grams, of H2 needed to completely react with this quantity of N2? A) 1.01 g B) 1.51 g C) 3.03 g D) 6.06 g E) none of the above
C) 3.03 g
37) If the theoretical yield of a reaction is 42.0 grams of product and the percent yield is 75%. How many grams were actually produced? A) 5400 B) 56 C) 32 D) 1.8 E) none of the above
C) 32
17) How many grams of water are made from the reaction of 4.0 grams of hydrogen gas? Given the reaction: 2H2 + O2 → 2H2O A) 18 B) 72 C) 36 D) 4.5 E) not enough information
C) 36
7) Diatomic N2 can react with diatomic H2 to form ammonia (NH3). The balanced chemical equation is: N2 +3H2 > 2NH3 If 6 moles of H2 totally reacted with more than enough N2, how many moles of ammonia would be expected to form? A) 2 moles B) 3 moles C) 4 moles D) 6 moles E) not enough information
C) 4 moles
8) 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) 1 mole B) 2 moles C) 4 moles D) 8 moles E) not enough information
C) 4 moles
11) How many moles of H2 can be made from complete reaction of 3.0 moles of Al? Given: 2 Al + 6 HCl → 2 AlCl3 + 3 H2 A) 3 moles B) 3.0 moles C) 4.5 moles D) 9.0 moles E) none of the above
C) 4.5 moles
22) Given that 4 NH3 + 5 O2 → 4 NO + 6 H2O, if 3.00 mol NH3 were made to react with excess of oxygen gas, the amount of H2O formed would be: A) 2.00 mol. B) 3.00 mol. C) 4.50 mol. D) 6.00 mol. E) none of the above
C) 4.50 mol.
48) How many grams of water are theoretically produced for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)2? Reaction: 2HCl + Ca(OH)2 → 2H2O + CaCl2 A) 25.2 B) 50.4 C) 46.8 D) 103.6 E) not enough information
C) 46.8
34) Determine the theoretical yield of C when 3 units of A and 10 units of B are reacted in the following generic chemical equation: 2A + 5B → 4C. A) 3 B) 4 C) 6 D) 8 E) none of the above
C) 6
31) What is the theoretical yield of waffles if you have 6 cups of flour, 9 eggs and 2 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles A) 10 B) 12 C) 8 D) 4 E) not enough information
C) 8
55) If 16.0 grams of aluminum oxide were actually produced, what is the percent yield of the reaction below given that you start with 10.0 g of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 → 2Al2O3 A) 75.0% B) 100% C) 84.7% D) 39.6% E) not enough information
C) 84.7%
23) Iron metal reacts with oxygen to produce iron(III) oxide. If you have 12.0 moles of iron for complete reaction, you need: A) 9.0 moles of O2 and produce 3.0 moles of Fe2O3. B) 12.0 moles of O2 and produce 24.0 moles of Fe2O3. C) 9.0 moles of O2 and produce 6.0 moles of Fe2O3. D) 4.5 moles of O2 and produce 3.0 moles of Fe2O3. E) none of the above
C) 9.0 moles of O2 and produce 6.0 moles of Fe2O3.
67) How many grams of the excess reactant remain assuming the reaction goes to completion and that you start with 15.5 g of Na2S and 12.1 g CuSO4? Reaction: Na2S + CuSO4 → Na2SO4 + CuS A) 0.05 B) 15.45 C) 9.58 D) 5.92 E) not enough information
C) 9.58
32) Consider the following generic chemical equation: 2A + 5B → C + 3D If you react 4 units of A with 10 units of B, which statement is TRUE? A) Substance A will be the limiting reactant. B) Substance B will be the limiting reactant. C) There is just enough of A and B so that everything reacts completely. D) Substance C cannot be formed from this reaction. E) none of the above
C) There is just enough of A and B so that everything reacts completely.
29) Which ingredient is the limiting reactant if you have 6 cups of flour, 9 eggs and 2 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles A) flour B) eggs C) oil D) waffles E) not enough information
C) oil
30) A tricycle factory uses the following items to produce one tricycle: 3 tires, 1 frame, and 2 pedals. If the factory has available 270 tires, 90 frames, and 170 pedals, which item would limit the amount of complete tricycles that can be assembled? A) tires B) frames C) pedals D) both tires and frames are limiting E) not enough information
C) pedals
15) Suppose two chemical reactions are linked together in a way that the O2 produced in the first reaction goes on to react completely with Mg to form MgO in the second reaction. Reaction one: 2 KClO3 → 3 O2 + 2 KCl Reaction two: 2 Mg + O2 → 2 MgO If you start with 4 moles of KClO3, how many moles of MgO could eventually form? A) 2 moles B) 4 moles C) 6 moles D) 12 moles E) none of the above
D) 12 moles
5) How many waffles can be made from 1 dozen eggs, assuming you have enough of all other ingredients? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles A) 48 B) 12 C) 4 D) 16 E) not enough information
D) 16
54) How many grams of aluminum oxide are produced according to the reaction below given that you start with 10.0 grams of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 → 2Al2O3 A) 40.4 B) 5.00 C) 0.185 D) 18.9 E) not enough information
D) 18.9
2) How many moles of water are needed to react with 2.2 moles of Li2O? Given: Li2O + H2O → 2 LiOH A) 4.4 B) 1.1 C) 1.5 D) 2.2 E) none of the above
D) 2.2
14) How many moles of sodium metal are needed to make 3.6 moles of sodium chloride? Given the reaction: 2Na + Cl2 → 2NaCl A) 0.9 B) 7.2 C) 1.8 D) 3.6 E) not enough information
D) 3.6
43) How many grams of calcium phosphate are theoretically produced if we start with 3.40 moles of Ca(NO3)2 and 2.40 moles of Li3PO4? Reaction: 3Ca(NO3)2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4)2 A) 310 B) 248 C) 1054 D) 351 E) not enough information
D) 351
1) Suppose a computer manufacturer can build circuit boards according to the following process: 12 resistors + 20 insulators + 8 memory chips → 4 circuit boards. How many circuit boards could you make using 30 insulators, assuming you have enough of all the other parts? A) 20 B) 4 C) 10 D) 6 E) none of the above
D) 6
12) How many moles of aluminum are needed to make 9 moles of molecular hydrogen? Given the reaction: 2 Al + 6 HCl → 2 AlCl3 + 3H2 A) 2 moles B) 3 moles C) 4 moles D) 6 moles E) none of the above
D) 6 moles
4) If the theoretical yield of the reaction below corresponds to 99.2 g and the actual yield was 60.9 g, calculate the percent yield. Given: Li2O +H2O → 2 LiOH A) 16.0 % B) 71.8 % C) 38.0 % D) 61.4 % E) none of the above
D) 61.4 %
5) What is the theoretical yield in grams of CuS for the following reaction given that you start with 15.5 g of Na2S and 12.1 g CuSO4? Reaction: Na2S + CuSO4 → Na2SO4 + CuS A) 0.0758 B) 0.198 C) 18.93 D) 7.25 E) not enough information
D) 7.25
4) Which of the following is TRUE? A) Stoichiometry shows the numerical relationship between chemical quantities in a balanced chemical equation. B) Stoichiometry allows prediction of the amounts of products that form in a chemical reaction based on the amounts of reactants. C) Stoichiometry allows prediction of how much of the reactants are necessary to form a given amount of product. D) All of the above are true. E) None of the above are true.
D) All of the above are true.
69) The reaction of one mole of nitrogen gas with three moles of hydrogen gas releases 92 kJ of thermal energy to the surroundings. Which of the following is TRUE? A) This reaction is exothermic. B) This reaction has a negative enthalpy of reaction. C) Complete reaction of two moles of nitrogen gas would release 184 kJ of thermal energy in this reaction. D) All of the above are true. E) None of the above are true.
D) All of the above are true.
2) Which of the below statements about global warming is FALSE? A) Some greenhouses gases are needed to keep the proper temperature balance. B) Greenhouse gases prevent heat from leaving the earth. C) Greenhouse gases allow sunlight to reach and heat the earth. D) If the level of greenhouse gases increases, the temperature will decrease. E) none of the above
D) If the level of greenhouse gases increases, the temperature will decrease.
64) Which is the limiting reactant in the following reaction given that you start with 42.0 g of CO2 and 99.9 g KOH? Reaction: CO2 + 2KOH → K2CO3 + H2O A) K2CO3 B) H2O C) CO2 D) KOH E) not enough information
D) KOH
36) A balanced chemical equation used to prepare ammonium carbonate, (NH4)2CO3 , is: 2 NH3 + CO2 + H2O > (NH4)2CO3 Which choice of reactant quantities shown below would result in the greatest amount of ammonium carbonate being formed? A) React 2 moles NH3 , 1 mole CO2 , and 1 mole H2O B) React 2 moles NH3 , 8 moles CO2 , and 8 moles H2O C) React 4 moles NH3 , 1 mole CO2 , and 2 moles H2O D) React 4 moles NH3 , 2 moles CO2 , and 2 moles H2O E) none of the above
D) React 4 moles NH3 , 2 moles CO2 , and 2 moles H2O
35) Given the balanced equation CO2 + Si → SiO2 + C, if you were to react 1 mole of CO2 with 1 mole of Si, which statement is TRUE? A) The CO2 is the limiting reactant. B) The Si is the limiting reactant. C) The SiO2 is the limiting reactant. D) You have equal stoichiometric amounts of reactants. E) none of the above
D) You have equal stoichiometric amounts of reactants.
1) The average global temperature depends on all factors EXCEPT what? A) the amount of incoming sunlight B) the amount of outgoing heat lost to space C) the amount of greenhouse gases D) the angle of the earth's surface in relation to the incoming sunlight E) All of the above are factors.
D) the angle of the earth's surface in relation to the incoming sunlight
49) In order to determine the limiting reactant in a particular reaction, one must know each of the following EXCEPT: A) the mass of each reactant present. B) the molar mass of each reactant present. C) the coefficient of each reactant in a balanced equation. D) the mass of each product formed.
D) the mass of each product formed.
12) Given the chemical equation: 2 Ca + O2 → 2 CaO, if 2 moles of CaO are formed in this reaction, then 2 moles of O2 must have reacted.
false
16) The limiting reactant is the reactant that produces the maximum amount of product.
false
17) The theoretical yield is the amount of each reactant needed in order to make the maximum amount of product.
false
18) The limiting reactant is the product that is completely consumed in a chemical reaction.
false
21) Given the recipe: 2 cups flour + 1 egg + 3 oz blueberries → 4 muffins If you have 5 cups of flour, 3 eggs and plenty of blueberries, the limiting reactant is the eggs.
false
24) The limiting reactant determines what the actual yield is.
false
29) For the following reaction you have 8 grams of hydrogen and 2 grams of oxygen. 2H2 + O2 → 2H2O The theoretical yield of the reaction is 4 grams of water.
false
30) For the following reaction you have 8 grams of hydrogen and 2 grams of oxygen. 2H2 + O2 → 2H2O The excess reactant is the oxygen.
false
31) If the theoretical yield of a reaction is 144 grams and the actual yield of the reaction is 72 grams, the percent yield of the reaction is 200%.
false
32) The enthalpy of reaction, △H rxn, is the amount of thermal energy that flows when a reaction occurs at constant temperature.
false
4) The primary source for the rising carbon dioxide levels is respiration of the Earth's growing population
false
5) One of the advantages of burning fossil fuels is that it produces O2 for humans to breathe.
false
7) Given the recipe: 2 cups flour + 1 egg + 3 oz blueberries → 4 muffins. You can make 9 muffins from 3.5 cups of flour.
false
9) If it takes 2 cups of milk and 1 cup of cocoa mix to make three servings of hot chocolate, and you only have 1 cup of each, then you cannot make any hot chocolate.
false
15) The conversion factor for moles of carbon dioxide to mass of carbon dioxide is: 1 mole CO2 ≡ 44.01 g.
true
19) The actual yield is the amount of product actually produced by a chemical reaction.
true
2) Global warming is due to the greenhouse gases preventing heat from Earth escaping into space.
true
20) The percent yield is calculated by dividing the actual yield by the theoretical yield times 100.
true
22) Given the recipe: 2 cups flour + 1 egg + 3 oz blueberries → 4 muffins If you have 9 cups of flour, 4 eggs and plenty of blueberries, the theoretical yield of muffins is 16
true
23) The actual yield is the same as the theoretical yield if the reaction goes to completion and there is no loss of product.
true
25) The limiting reactant is not necessarily the reactant with the least mass.
true
26) When viewing a chemical equation, the limiting reactant can never be a chemical on the product side of the equation.
true
27) The percent yield can never be greater than 100%.
true
28) For the following reaction you have 8 grams of hydrogen and 2 grams of oxygen. 2H2 + O2 → 2H2O The limiting reagent is the oxygen.
true
3) The primary greenhouse gas is carbon dioxide.
true
33) Thermal energy flows into the reaction and out of the surroundings in an endothermic reaction.
true
34) An exothermic reaction has a negative enthalpy of reaction.
true
35) Since heat must be supplied to melt ice, the melting of ice is an endothermic process and so has a positive enthalpy value.
true
36) Given the following generic equation, 2 A + 3B → A2B3 △H rxn = +444 kJ, if you completely reacted 1 mole of compound A, the amount of heat absorbed would be 222 kJ.
true
6) Stoichiometry is a chemist's version of following a recipe.
true
8) Given the recipe: 2 cups flour + 1 egg + 3 oz blueberries → 4 muffins. You can make 1 dozen muffins from 3 eggs
true