1. Test Review Chemical Reactions and Stoichiometry

2. This test includes: 1. identifying types of reactions 2. writing and balancing of equations 3. calculation of moles, mass and volume of reactants and products. 4. calculation of the % yield of a reaction.

3. CaCO 3 → CaO + CO 2 Which is true of the above reaction? A. Calcium oxide and carbon dioxide are reactants. B. The reaction involves the decomposition of calcium carbonate. C. The reaction involves the combination of calcium oxide and carbon dioxide. D. The reaction involves the combustion of calcium carbonate. B

4. Which is a single displacement reaction? A. NH 4 NO 2 → N 2 + 2H 2 O B. Na 2 SO 4 + Ba(NO 3 ) 2 → BaSO 4 + 2NaNO 3 C. Fe + 2HCl → FeCl 2 + H 2 D. C 2 H 5 OH + 3O 2 → 2CO 2 + 3H 2 O C

5. Which of these equations is balanced? A. NH 4 NO 2 → N 2 + H 2 O B. NH 3 + HCl → NH 4 Cl C. 2NH 3 → N 2 + H 2 D. NH 4 NO 3 → N 2 O + H 2 O B

6. NH 3 + HCl → NH 4 Cl How many moles of hydrogen chloride are needed to produce 0.35 moles of ammonium chloride? 0.35 moles HCl

7. NH 3 + HCl → NH 4 Cl How many grams of NH 3 are needed to produce 25 g of ammonium chloride? 8.0 g NH 3

8. 2NH 3 → N 2 + 3H 2 How many moles of NH 3 are needed to produce 2.0 g of hydrogen? 0.67 moles NH 3

9. Propane reacts with oxygen to produce water and carbon dioxide based on the equation: C 3 H 8 +5O 2 →4H 2 O+3CO 2 What volume of propane at STP is needed to produce 6.0 moles of CO 2 ? 44.8 L

10. Propane reacts with oxygen to produce water and carbon dioxide based on the equation: C 3 H 8 +5O 2 →4H 2 O+3CO 2 How many grams of oxygen gas are needed to completely burn 22.4 L of propane at STP? 160 g

11. 2H 2 O → 2H 2 + O 2 1. How many grams of oxygen can be formed from the decomposition of 36 g of water? 2. If only 30 g of oxygen is actually produced from 36 g of water, what is the % yield of the reaction? 32 g O 2, 94%

12. 4Al+ 3O 2 → 2Al 2 O 3 100.0 g of Al and 100.0 g of O 2 react. What are the limiting and excess reactants? How many grams of Al 2 O 3 are produced? Limiting: Al Excess: O 2 188.9 g Al 2 O3