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26 Cards in this Set
- Front
- Back
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In any chemical reaction, the quantities that are preserved are___? |
mass and number of atoms or (always equal?) |
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In the chemical reaction 2CO(g) + O2(g) --> 2CO2(g), what is the ratio of moles of oxygen used to moles of CO2 produced |
1:2 |
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Which of the following is true about the total number of reactants and the total number of products in thereaction shown below? C5H12 (l)+8O2 (g)--> 5CO2 (g)+6H2O(g) |
9 moles of reactants chemically change into 11 moles of product |
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calculate the number of moles of Al2O3 that are produced when 0.60 mol of Fe is produced in the following reaction |
0.20 |
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How many moles of glucose, C H O , can be "burned" biologically when 10.0 mol of oxygen is available?C6H12O6 (s)+6O2 (g)--> 6CO2 (g)+6H2 O(l) |
1.67 mol |
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Hydrogen gas can be produced by reacting aluminum with sulfuric acid. How many moles of sulfuric acid areneeded to completely react with 15.0 mol of aluminum? 2Al(s)+3H2SO4 (aq) -->Al2 (SO4)3 (aq)+3H2 (g) |
22.5 mol |
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when iron rusts in air, iron (III) oxide is produced. How many moles of oxygen react with 2.4 mo, of iron in the rusting reaction |
1.8 mol |
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which type of stoichiometric calculation does not require the use of the molar mass |
volume-volume problems |
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when glucose is consumed, it reacts with oxygen in the body to produce carbon dioxide, water, and energy. How many grams of carbon dioxide would be produced if 45g of C6H12O6 completely reacted with oxygen |
0.66g |
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Mercury can be obtained by reacting mercury(II) sulfide with calcium oxide. How many grams of calciumoxide are needed to produce 36.0 g of Hg? 4HgS(s) + 4CaO(s) -->4Hg(l) + 3CaS(s) + CaSO4 |
10.1g |
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Which conversion factor do you use first to calculate the number of grams of CO produced by the reaction of50.6 g of CH with O ? The equation for the complete combustion of methane is: CH4(g) + 2O2 (g) --> CO2 (g) + 2 H2O |
1 mol ---------- 16.0g CH4 |
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Which of the following is NOT true about limiting and excess reagents |
the reactants that has the smallest given mass is the limiting reagent |
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How many grams of chromium are needed to react with an excess of CuSO to produce 27.0 g Cu?2Cr(s) + 3CuSO4 (aq) --Cr2 (SO4 )3 (aq) + 3Cu(s) |
14.7g |
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Which of the following would be limiting reagent in the reaction shown below 2H2(g) + O2(g) --> 2H2O(g) |
50 molecules of H2 |
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Which of the following is NOT a reason why actual yield is less than theoretical yield |
conversion of mass |
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in every chemical reaction, ________ |
mass and atoms are conserved |
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the first step in most stoichiometry problems is to ____. |
convert given quantities to moles |
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the calculation of quantities in chemical equations is called ____. |
stoichiometry |
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the amount of product formed when a reaction is carried out in the lab |
actual yield |
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the ratio of the actual yield to the theoretical yield |
percent yield |
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the max amount of product that could be formed from given amounts of reactants |
theoretical yield |
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the reactant that is not completely used up in a reaction |
excess reagent |
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the reactant that determines the amount of product that can be formed in a reaction |
limiting reagent |
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this is conserved in every ordinary chemical reaction |
mass |
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this quantity can always be used in the same way as moles when interpreting balanced chemical equations |
number of moles |
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this is conserved only in reactions where the temp. is constant and the # of moles of gaseous reactants is the same as that of gaseous products |
volume |
