CHAPTER 11 CHEM FINAL

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brownamanda  on May 27, 2012

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CHAPTER 11 CHEM FINAL

 The coefficients in front of substances in chemical equation representmoles of each substance.
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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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