Stoichiometry

Mix

100

This is the branch of chemistry that deals with mass relationships in compounds and reactions.

What is Stoichiometry

200

In a chemical reaction, these numbers can be used to determine the mole ratio of any reactants and/or products.

What are coefficients?

300

These are the units of molar mass.

What is g/mol.

400

In the reaction represented by the equation 

2Al₂O₃   →   4Al + 3O₂,   this is the mole ratio of Aluminum to Aluminum Oxide.

What is 2:1

500

This is the molar mass of Copper(II) Sulfate.

What is a 160 g/mol?

Moles

100

This is the coefficient of hydrogen gas in the balanced form of the following reaction: 

H₂ + O₂  →  H₂O

What is 2

200

This is the coefficient in front of nitrogen gas in the correctly balanced form of the equation: 

(NH₄)NO₂  →  N₂ + H₂O

What is 1

300

This is the amount of moles of water that are made from complete reaction of 2.2 moles of oxygen gas with hydrogen gas Given the reaction: 

2H₂ + O₂ → 2H₂O

What is 4.4 moles

400

This is the amount of moles of H₂ that can be made from the complete reaction of 3.0 moles of Al Given: 

2 Al + 6 HCl  →  2 AlCl₃ + 3 H₂

What is 4.5 moles

500

This is how many moles of LiOH are required to react 20 moles of CO₂ in the following reaction: 

CO₂ + 2LiOH  →  Li₂CO₃ + H₂O

What is 40 moles.

Stoich

100

This is the amount of magnesium chloride produced (in grams) if 0.80 moles of magnesium react with excess hydrochloric acid  (unbalanced)

Mg + HCl  →  MgCl₂ + H₂

What is 76.2 grams

200

This is the amount of lithium nitride (grams) produced if 1 mole of Lithium reacts with an excess of nitrogen gas. The reaction: 

6 Li + N₂ → 2 Li₃N

What is 11.6 grams Li₃N

300

This is the amount of calcium carbonate produced when a chemist reacts 2 moles of CaO with an excess of CO₂. (It's balanced.)

CO₂ + CaO  -->  CaCO₃ 

What is 200.2 grams CaCO₃ 

 

400

This is the amount (in grams) of zinc chloride produced from the reaction of 202.7 grams of lithium chloride and an excess of zinc.

(You write & balance  the equation first.)

What is 329 g

500

This is the amount (in grams) of aluminum oxide produced from the reaction of 0.353 grams solid aluminum with an excess of oxygen gas.

You write the equation and balance it first.

What is 0.663 grams.

Limiting Reagent

100

This is the ingredient that is the limiting reactant if you have 5 cups of flour, 9 eggs and 3 tbs of oil? Given: 

2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

What is flour

200

In a chemical reaction, reactants that are not used up when the reaction is finished are called...

What is excess reactants

300

  There are 100.0 grams of each reactant available. Determine the limiting reactant in this equation. 

SO₂ + 2NaOH → Na₂SO₃ + H₂O

What is NaOH

400

  This is the theoretical yield of silicon carbide if 50.0 grams of silicon dioxide reacts with 79.1 grams of Carbon.  (Balance it first.)

SiO₂ + C → SiC + CO

What is 33.3 g

500

This is the amount (g) of lead chloride formed if 135.8g of sodium chloride reacts with 95.7g of lead(II) in a single replacement reaction.

You write and balance the equation first.

What is 128.06g

% Yield

100

The percent yield tells you a ratio between the actual yield and the _________ yield of a certain product.

What is theoretical

200

This is the actual amount of grams produced if the theoretical yield of a reaction is 42.0 grams of product and the percent yield is 75%.

What is 31.5 g  (0.75*42.0)

300

This is the percent yield when a sample of 8.5 g NH₃ on oxidation produces 4.5 g of NO. Reaction: 

4 NH₃ + 5 O₂ → 4 NO + 6 H₂O

What is 30 %

400

  This is the percent yield if 155 grams of calcium carbonate is treated with 250 grams of hydrochloric acid and 142 grams of calcium chloride is obtained? 

CaCO₃ + HCl   →  CaCl₂ + CO₂ + H₂O

What is 56.6%

500

This is the percent yield of CuS given that you start with ? 15.5 g Na₂S and ? 12.1 g CuSO₄. The actual amount of CuS produced was ?3.05g . Reaction: 

Na₂S + CuSO₄  →  Na₂SO4 + CuS

What is 42.1%?