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Chemical Warfare Unit 2 – Chem B
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What is the balanced equation for the decomposition of hydrogen peroxide into water and oxygen gas?
2H2O2 2H2O + O2
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What does the abbreviation STP stand for?
Standard Temperature & Pressure
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One mole of a compound contains how many particles?
6.02x1023 particles
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One mole of carbon has a mass of how many grams?
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6.02x1023 is also known as Avagodro’s Number
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The sum of the masses of the elements composing a compound is known as its
Formula Mass
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One mole of any gas has what molar volume?
22.4 Liters
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The mass of each element in a compound divided by the formula mass is the
Percent composition
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What is the percent composition of CO2?
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Write the balanced formula for the reaction of iron with oxygen gas to form iron (III) oxide.
4Fe + 3O2 2Fe2O3
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If 4.3g of iron reacts with oxygen, as in the previous formula, what mass of Fe2O3 would be produced? 6.1 g Fe2O3 4.3g Fe 1mol Fe 2mol Fe2O3 160g Fe2O3 56g Fe 4mol Fe 1mol Fe2O3
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How many liters of oxygen are required for the previous reaction?
1.29 L O2 4.3g Fe 1mol Fe 3mol O2 22.4 L O2 56g Fe 4mol Fe 1mol O2
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Aluminum reacts with bromine gas to produce aluminum bromide
Aluminum reacts with bromine gas to produce aluminum bromide. What is the balanced equation for this reaction? 2Al + 3Br2 2AlBr3
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What type of reaction is the one previously written
What type of reaction is the one previously written? 2Al + 3Br2 2AlBr3 Synthesis reaction
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If 15.0g Al reacts with 46.0g Br2, which is the limiting reactant?
1mol Al 2mol AlBr3 267g AlBr3 27g Al 2mol Al 1mol AlBr3 = 148.3g 46.0g Br2 1mol Br2 2mol AlBr3 267g AlBr3 160g Br2 3mol Br2 1mol AlBr3 = 51.2g
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Find the empirical formula for the compound that consists of 20
Find the empirical formula for the compound that consists of 20.23% Al and 79.77% Cl. AlCl3 20.23g Al 1mol Al = .75 mol Al 27g Al = 1 .75 = 3 79.77g Cl 1mol Cl = 2.28 mol Cl 35g Cl .75
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Al2Cl6 AlCl3 formula mass = 132 264/132 = 2
If the molar mass of the compound in the previous question is 264g, what is the molecular formula? Al2Cl6 AlCl3 formula mass = 132 264/132 = 2
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For the formula 2P + 3Br2 2PBr3, if 5
For the formula 2P + 3Br2 2PBr3, if 5.0g P and 35g of Br2 react, what is the limiting reactant and how what mass of PBr3 is produced? 35g Br2 produces 39.5g PBr3 5.0g P 1mol P 2mol PBr3 271g PBr3 31g P 2mol P 1mol PBr3 = 43.7g 35g Br2 1mol Br2 2mol PBr3 271g PBr3 160g Br2 3mol Br2 1mol PBr3 = 39.5g
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If the actual yield of PBr3 from the previous problem is 30g, what is the percent yield?
75.9% 30g/39.5g
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Criss cross the ionic charges
In the writing of an ionic compound, how do we determine the number of each atom in the compound? Criss cross the ionic charges
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What law are we following when we balance a chemical equation?
Law of Conservation of Mass
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Balance the following equation: Ca(ClO3)2 CaCl2 + O2
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What is the formula for: iron (III) carbonate?
Fe2(CO3)3
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Write the balanced equation for the following word equation: Aluminum chloride + Calcium Aluminum + Calcium chloride 2AlCl3 + 3Ca 2Al + 3CaCl2
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