Unit 4 Review

Reactions

100

What type of reaction is this and balance it:

H₂ + I₂ -> HI

synthesis;

H₂ + I₂ -> 2HI

200

K₂C₂O₄ + Ba(OH)₂ -> 2KOH + BaC₂O₄

Double Displacement;

K₂C₂O₄ + Ba(OH)₂ -> 2KOH + BaC₂O₄

300

(NH₄)Cr₂O₇ -> Cr₂O₃ + N₂ + H₂O

Decomposition;

2(NH₄)Cr₂O₇ -> Cr₂O₃ + N₂ + 4H₂O

400

Na + H₂O -> NaOH + H₂

Single Replacement; 

2Na + 2H₂O -> 2NaOH + H₂

500

C₄H₆ + O₂ -> CO₂ + H₂O

Combustion;

2C₄H₆ + 11O₂ -> 8CO₂ + 6H₂O

Predicting Products

100

Predict the product and balance:

H₂ + Cl₂ ->

H₂ + Cl₂ -> 2HCl

200

Predict the product and balance:

Ca + AgCl ->

Ca + 2AgCl -> CaCl₂ + 2Ag

300

Predict the product and balance:

H₂SO₄ + BaCl₂ ->

H₂SO₄ + BaCl₂ -> BaSO₄ + 2HCl

400

Predict the product and balance:

KClO₃ ->

2KClO₃ ->2KCl + 3O₂

500

Predict the product and balance:

CH₄ + O₂ ->

CH₄ + 2O₂ -> CO₂ + 2H₂O

Stoichiometry

100

2Na + 2H₂O -> 2NaOH + H₂

What is the mole to mole ratio between Na and H₂?

2 moles Na: 1 mole H₂

200

2(NH₄)Cr₂O₇ -> Cr₂O₃ + N₂ + 4H₂O

Which mole to mole ratio is bigger:

moles of N₂ to (NH₄)Cr₂O₇ or H₂O to (NH₄)Cr₂O₇ and why?

H₂O to (NH₄)Cr₂O₇ 

300

H₂ + Cl₂ -> 2HCl

If you start with 2 mol H₂, how many moles of HCl are produced?

4 mol HCl

400

Ca + 2AgCl -> CaCl₂ + 2Ag

286.64 g AgCl react with excess Calcium. How many moles of CaCl₂ are produced?

1 mol CaCl₂

500

H₂SO₄ + BaCl₂ -> BaSO₄ + 2HCl

If you have 5.00g BaCl_2, how much mass of BaSO₄ is produced?

5.60g BaSO₄

Limiting Reactant

100

What is a limiting reactant?

*first to be consumed in reaction

*limits how much product formed

200

2H₂ + CO --> CH₃OH

We have 16 moles of hydrogen combining with 15 moles of carbon monoxide, which one is the limiting reactant AND how much product will be formed?

hydrogen, 8 moles formed of product

300

C₁₂H₂₂O₁₁ + 12O₂ ---> 12CO₂ + 11H₂O

there are 10.0 g of sucrose and 10.0 g of oxygen reacting. How many moles of carbon dioxide are produced?

0.3125 mol carbon dioxide

400

CuCl₂ + 2NaNO₃ -> Cu(NO₃)₂ + 2NaCl

If 15 g copper (ii) chloride react with 20 g sodium nitrate, how much sodium chloride can be formed?

13 g sodium chloride

500

3NH₄NO₃ + Na₃PO₄ -> (NH₄)₃PO₄ + 3NaNO₃

starting with 30 g of ammonium nitrate and 50 g of sodium phosphate, how much of the excess reactant remains after the reaction?

29.5 g sodium phosphate

Percent Yield

100

what is the equation for percent yield?

actual/theoretical x 100%

200

How do we calculate:

1. actual 

2. theoretical

1. given / lab experiment

2. calculated using stoichiometry / math

300

A reaction with a calculated yield of 9.23 g produced 7.89 g of product. What is the percent yield for this reaction?

85.5%

400

2(NH₄)Cr₂O₇ -> Cr₂O₃ + N₂ + 4H₂O

If you start with 4 mol of the reactant, and produce 1.80 mol of nitrogen. What is the percent yield?

90%

500

9.87 g ammonia react completely according to the reaction

2NH₃ + CO₂ -> CN₂OH₄ + H₂O

If 13.74 g of urea are produced, what is the percent yield for this reaction?

79.0%