CHAPTER 11 CHEM FINAL
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18 terms
Terms | Definitions |
|---|---|
 The coefficients in front of substances in chemical equation represent | moles of each substance. |
| Which statement below is correct for the reaction 2H2 + O2 -> 2H2O | 2 moles of hydrogen react with 1 mole of oxygen |
| The reactant that gets used up completely in a chemical reaction is called he | limiting reactant |
| The meaning of stoichiometry is | measuring elements |
| The ratio of product actually produced in a reaction and the amount of product that could be theoretically produced is called | percent yield |
| Before using an equation to perform stoichiometric conversions, it must be | balanced |
| In the reaction N2 + 2O2 -> 2NO2 how many moles of oxygen would be required to react with 2 moles of nitrogen? | 4 |
| In a chemical reaction the mass of the reactants must always equal the mass of the __________ according to the law of conservation of mass. | products |
| In a reaction, which substance determines how much of a product is formed? | The limiting reactant |
| A reaction that has been calculated to theoretically produce 60.0 g CuCl2 actually produces 50.0 g of CuCl2. What is the percent yield? | 50.0 g/60.0 g x 100% = 83.33% |
| In ny chemical reaction, the quantities that are conserved are: | mass and number of atoms |
| If a reaction occurs and 100 g of product was expected to be made, but only 85 g of the product is recovered after the experiment, what percent of the product is recovered? | 85/100 x 100 = 85.00% |
| T/F. Most times 100% of a product will be recovered in an experiment. | False |
| T/F. Mole ratios express relationships between substances in a balanced equation. | True |
| T/F. In mass-mass conversion problems, you will have to convert to volume first. | False |
| T/F. Excess reactant is the reactant that is left over after a reaction is complete. | True |
| T/F. To convert from moles of one type of substance to moles of a different type of substance, you have to use the balanced equation. | True |
| stoichiometry | see test |
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