Chemical Warfare Unit 2 – Chem B.

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Presentation transcript:

Chemical Warfare Unit 2 – Chem B

What is the balanced equation for the decomposition of hydrogen peroxide into water and oxygen gas? 2H2O2  2H2O + O2

What does the abbreviation STP stand for? Standard Temperature & Pressure

One mole of a compound contains how many particles? 6.02x1023 particles

One mole of carbon has a mass of how many grams?

6.02x1023 is also known as Avagodro’s Number

The sum of the masses of the elements composing a compound is known as its Formula Mass

One mole of any gas has what molar volume? 22.4 Liters

The mass of each element in a compound divided by the formula mass is the Percent composition

What is the percent composition of CO2?

Write the balanced formula for the reaction of iron with oxygen gas to form iron (III) oxide. 4Fe + 3O2  2Fe2O3

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

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

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

What type of reaction is the one previously written What type of reaction is the one previously written? 2Al + 3Br2  2AlBr3 Synthesis reaction

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

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

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

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

If the actual yield of PBr3 from the previous problem is 30g, what is the percent yield? 75.9% 30g/39.5g

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

What law are we following when we balance a chemical equation? Law of Conservation of Mass

Balance the following equation: Ca(ClO3)2  CaCl2 + O2

What is the formula for: iron (III) carbonate? Fe2(CO3)3

Write the balanced equation for the following word equation: Aluminum chloride + Calcium  Aluminum + Calcium chloride 2AlCl3 + 3Ca  2Al + 3CaCl2