Date: ______________________________
Word and Skeleton Equations
1. Examine the following word equation:
propane + oxygen  carbon dioxide + water
a) List all the reactants in this reaction. ___________________________________
b) List all the products in this reaction. ___________________________________
c) What is the purpose of the arrow in the word equation?
_________________________________________________________________
2. Write word equations for the following reactions:
a) CaCl2 and Na2SO4 react to form CaSO4 and NaCl
b) BaCO3 reacts when heated to produce BaO and CO2
c) AgNO3 reacts with KCl to produce AgCl and KNO3
For the following questions, write a) the word equation and b) the chemical equation (AKA the “skeleton equation”):
3. Magnesium metal burns in oxygen gas with a bright white light to make a white powder called magnesium oxide.
4. A solution of sodium iodide is added to a solution of potassium nitrate to make a potassium iodide precipitate and a
sodium nitrate solution.
5. Gaseous hydrogen and gaseous oxygen react explosively to form water vapor.
6. Aluminum resists corrosion because it reacts with a gas found in air to form a protective coating of aluminum oxide.
Date: ______________________________
Law of Conservation of Mass
For the following questions write a) the word equation, b) the skeleton equation (i.e. the chemical equation) and
c) solve for the missing mass.
1. 28 g of hydrogen gas reacts with 112 g of oxygen gas to form water. How much water is produced?
2. 2.40 g of iron reacts with oxygen gas to form 2.56 g of iron (II) oxide. How much oxygen reacted?
3. 126.9 g of copper (II) sulfide breaks apart into sulfur and 101.6 g of copper. How much sulfur is produced?
4. 102.9 g of sodium bromide reacts with silver nitrate to form 85.0 g of sodium nitrate and 187.8 g of silver
bromide. How much silver nitrate reacted?
5. 12.0 g of carbon reacts with 32.0 g of oxygen gas to form carbon dioxide. How many grams of carbon dioxide
are formed?
6. 36.0 g of water breaks apart into oxygen gas and 4 g of hydrogen gas. How much oxygen is produced?
7. 159.6 g of copper (II) sulfate reacts with 80 g of sodium hydroxide to form 97.5 g of copper (II) hydroxide and
sodium sulfate. How much sodium sulfate was produced?
8. 141.1 g of sodium sulfate reacts with barium chloride to produce 233.4 g of barium sulfate and 117.0 g of
sodium chloride. How much barium chloride reacted?