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32 Cards in this Set
- Front
- Back
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A molecule is 11% H and 89% O, find empirical formula
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H2O
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A molecule is 44.77% C, 7.52% H, and 47.71% O. Find empirical formula. If molecular mass is 268, what is the molecular formula?
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c5h10o4 E.F.
c10h20o8 M.F. |
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Distinguish between a cation and an anion
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a cation loses electrons and is positively charged. Anions gain electrons and are neg charged.
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in 3.5 moles of aluminum nitrate, how many moles of each element are there?
how many grams of each element are there? |
Al: 3.5 moles
N: 10.5 moles O: 31.5 moles 94 g Al 142 g N 504 g O |
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in .965 moles of calcium chlorite, how many atoms of oxygen are there?
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2.32 x 10^24 atoms
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What is the percent composition of lithium chromate
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Li: 10.70%
Cr: 40.03% O: 49.27% |
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What is the charge on an atom
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0 is the charge on an atom
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oxidation state of any compound
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0 is the ox state of any compound
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oxidation state of group 1 ions? group 2 ions?
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group 1 is plus 1 and group 2 is plus 2
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What is the only oxidation state of fluorine
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-1
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There are two oxidation states of hydrogen. what are they?
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1 and -1
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There are three ions of oxygen. what are they and their charges?
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o2^-2 is peroxide
o^-2 is oxide o2^- is superoxide |
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in binary compounds, what is the oxidation state of group 17, of group 16, and of group 15
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17 is -1
16 is -2 15 is plus 3 |
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what is a binary compound and a ternary compound
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binary compound is a two-element compound
ternary is three-element compound |
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what is polyatomic ion
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an electrically charged group of 2 or more atoms
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what is an oxoanion
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a polyatomic ion with oxygen attached to another element
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in an ion, what does thio- mean?
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an oxygen atom has been replaced by a sulfur atom
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what is the charge of Mn ins KMnO4?
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plus 7
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what is charge of C in Na2C2O4?
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plus 5
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what is charge of Cr in Cr2O7^-2?
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plus 6
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what is charge of S in SF6
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plus 6
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what is charge of Br in Ba(BrO4)2?
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-7
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what is a hydrate
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a compound with water molecules attached to it.
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list prefixes for covalent compounds for numbers 1 through 15
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mono
di tri tetra penta hexa hepta octo non deca |
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what are the five types of chemical rxns we've discussed so far?
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double replacement, synthesis, single replacement, decomposition, combustion
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the arrow in a chemical equation can have things above it. what are some examples of things that can appear there and what do they mean?
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delta: addition of heat;
temp and press conditions catalysts: lower activation energy |
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when 12 grams of sulfuric acid reacts with potassium hydroxide, what mass of water is formed?
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4.4 g of h20
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if 15.0 mL of .10 M zinc nitrate reacts with lithium hydroxide, what mass of zinc hydroxide is formed?
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.15 g of zn(oh)2
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if 13.5 g of ammonium sulfate reacts with 12.2 grams of barium fluoride, which one is the limiting reagent? How much of the excess reactant is left over?
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BaF2 is limiting reagent. 4.5 g of excess reactant. (NH4)2(SO4)
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If 22.0mL of .15 M hydrobromic acid is mixed with 16.25 mL of .20 M strontium hydroxide, which one is the limiting reagent? What volume of the excess is left over?
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HB is limiting reagent. 8 mL of Sr(OH)2 is left over.
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in a lab, you were expecting to produce 15 grams of a product. if you actually produce 12.5 grams, what is your percent yield?
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83% yield
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When 1.8 moles of CCl4 react with excess HF, the products are CCl2F2 and HCl. If 1.55 moles of CCl2F2 are obtained, what are the theoretical yield, actual yield, and percent yield?
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Actual yield: 1.55 moles.
86% yield Theoretical yield: 1.8 mol CCl2F2 |
