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Chemical Names and Formulas
Chemical Quantities
Chemical Reactions
Stoichiometry
Leave It To Chance
100
This common liquid has the formul of H2O
What is water
100
This is a quantity like a dozen, but instead of twelve things it means 6.022 x 10^23 things
What is a mole
100
These are the products for the reaction that occurs from mixing HCl and Na2CO3
What is water, carbon dioxide, and sodium chloride
100
This is the balanced equation for the formation of water from hydrogen and oxygen gas.
What is 2 H2 + O2 ---> 2 H2O
100
This is the formula for hydrobromic acid
What is HBr
200
This is the chemical formula for ammonia, a stinky gas that is in some window cleaners.
What is NH3
200
This is the quantity that allows you to convert from grams of a substance to moles of a substance
What is atomic weight or molecular weight.
200
This is a type of reaction where two reactants combine to make one product like: 2 H2 + O2 ---> 2 H2O
What is a combination or synthesis reaction
200
This is the most ammonia gas you could make if you mixed 2.2 liters of nitrogen gas with 5 liters of hydrogen gas.
What is 10/3 liters or 3 and 1/3 liters N2 + 3 H2 ---> 2 NH3
200
This is the formula for dihydrogen sulfide
What is H2S
300
A salutation from hydro-iodic acid tells you this is its chemical formula.
What is HI
300
There are this many moles of single oxygen atoms in a mole of sodium carbonate.
What is three.
300
These are the products of a typical combustion reaction involving a hydrocarbon and oxygen.
What is carbon dioxide and water
300
This is the amount of product you obtained from a reaction divided by the largest possible amount times 100. Also the lab result divided by the theoretical result times 100.
What is Percent yield.
300
This is the number of moles in 67.2 L of a gas at STP
What is 3
400
Aluminum oxide indicates the charges on both the aluminum and the oxide ions with this formula.
What is Al2O3
400
This is the molar mass sulfuric acid.
What is 98 grams/ mol
400
This is the balanced equation for the combustion of acetylene gas in the presence of oxygen gas.
What is 2 C2H2 + 5 O2 ---> 4 CO2 + 2 H2O
400
This is the limiting reactant when 7.2 grams of calcium oxide are combined with 3 liters of carbon dioxide.
What is Calcium oxide at 0.1 moles (CO2 is almost .15 moles) CaO + CO2 ---> CaCO3
400
This is the balanced equation for the combination reaction of solid carbon and oxygen gas to form carbon monoxide.
What is 2 C (s) + O2 (g) --> 2 CO
500
Tin (IV) carbonate and Tin (II) Carbonate have these formulas
What is SnCO3 and SN(CO3)2
500
This is the approximate density, in g/liter, of Radon gas at STP.
What is 10 g/ liter. (9.9g/L)
500
This is the net ionic equation for Calcium hydroxide reacting with hydrochloric acid to form calcium chloride and water
What is (Ca++) + 2(OH-) + 2(H+) + 2(Cl-) ---> CaCl (s) +H2O (l) or just: (Ca++) + 2(Cl-) ---> CaCl (s)
500
This would be the percent yield if 11 g of iron metal oxidized with excess oxygen to form 12 grams of iron (III) oxide.
What is 75% Fe=56 g/mol 4 Fe + 3 O2 --> 2 Fe2O3 11/56=0.2, 0.2mol Fe x (2 mol Fe2O3/ 4 mol Fe)= 0.1 0.1 mol Fe2O3 x 160 g/ mol = 16 (theoretical yield) (2 x 56 + 3 x 16 )= 48 + 112 = 160 g/ mol 12/16=0.75, 0.75 x 100% = 75 %
500
This is the limiting reactant when 3.2 grams of solid sulfur combines with 6 L of fluorine gas.
What is fluorine gas S (s) + 3 F2 (g) ----> SF6 3.2 g/ 32 (g/mol) = 0.1 moles 6L/22.4 (L/mol) = about .27 The coefficient means we are comparing .27 / 3 to 0.1 .27/3 = 0.09 < 0.1