Vocabulary
Moles to Moles
Mixed Problems
Mass to Mass
Miscellaneous
100
A conversion factor that relates the amounts in moles of any two substances involved in a chemical reaction.
What is mole ratio?
100

CO2 + 2LiOH --> Li2CO3 + H2

The number of moles of lithium hydroxide that are required to react with 20 mol of CO2...

What is 40 mol LiOH?

100

Mg + 2HCl --> MgCl2 + H2 

The number of grams of hydrogen that will be produced if we start with 2.0 moles of hydrochloric acid and excess magnesium...

What is 2.0 g H2?

100

Mg + 2HCl --> MgCl2 + H2 

The mass of hydrogen that is produced from the reaction of 75 g HCl (MM=36.46 g/mol) and excess Mg...

What is 2.1 g H2?

100

N2 + 3H2 --> 2NH3 

In the reaction above, a student reacted 28 g of nitrogen with an excess of hydrogen. According to the students measurements, the reaction produced 30. g of product. The theoretical yield was 34 g. The student's percent yield is...

What is 88%?

200
The measured amount of product obtained after performing a chemical reaction.
What is actual yield?
200

6CO2 +6H2O --> C6H12O6 + 6O2 

The number of moles of carbon dioxide that are needed to react with 3.25 mol of water in the reaction described above...

What is 3.25 mol CO2?

200

Mg + 2HCl --> MgCl2 + H2 

The mass of hydrochloric acid (MM=36.46 g/mol) needed to react with 2.50 moles of magnesium...

What is 182 g HCl?

200

2KClO3 --> 2KCl + 3O2 

The number of grams of KCl that are produced if 5.0 g of KClO3 is decomposed...

What is 3.0 g KCl?

200

Avogadro's number.

What is 6.02 x 1023?

300

The reactant that determines the amounts of the other reactants that can combine--and the amount of product that can form--in a chemical reaction.

What is the limiting reactant?

300

2Mg +O2 --> 2MgO 

The number of moles of magnesium oxide that are produced from 1.2 moles of magnesium...

What is 1.2 mol MgO?

300

The number of moles of aluminum that are needed to combine with 1.58 mol of oxygen molecules to make aluminum oxide...

What is 2.11 mol Al?

300

Sodium and chlorine react to produce sodium chloride (table salt; MM=58.44 g/mol). 

The mass of sodium chloride that can be produced from 24.7 g of sodium and excess chlorine...

What is 62.8 g NaCl?

300

How many moles are present in 34 grams of Cu(OH)2?

What is 0.35 mol Cu(OH)2?

400
The ratio of the actual yield to the theoretical yield, multiplied by 100.
What is percent yield?
400

Ammonia, NH3, is widely used as a fertilizer and in many household cleaners. 

The number of moles of ammonia that are produced when 6 mol of hydrogen gas react with an excess of nitrogen gas...

What is 4 mol NH3?

400

Ammonia (NH3) decomposes to produce nitrogen and hydrogen gases. 

The number of moles of hydrogen that can be formed by the decomposition of 0.145 moles of ammonia...

What is 0.218 mol H2?

400

Sodium hydroxide reacts with sulfuric acid (H2SO4; MM=98.09 g/mol) to form water and sodium sulfate. 

How many grams of sodium sulfate (MM=142.05 g/mol) will be formed from 200. g NaOH (MM=40.00 g/mol) and an excess of sulfuric acid?

What is 355 g Na2SO4?

400

Write the complete balanced equation for the following reaction (include states): When lithium hydroxide pellets are added to a solution of sulfuric acid (H2SO4(aq)), aqueous lithium sulfate and water are formed.

What is: 2LiOH (s) + H2SO4 (aq) --> Li2SO4 (aq) + 2H2O (l)

500
States that mass is neither created nor destroyed during ordinary chemical or physical reactions. (This is why we balance chemical equations!)
What is the law of conservation of mass?
500

Hydrogen and oxygen gases react under a specific set of conditions to produce water. 

The number of moles of oxygen that would be required to produce 5.0 moles of water...

What is 2.5 mol O2?

500

Aluminum oxide reacts with iron to form Fe3O4 and aluminum. 

The limiting reactant when 5 moles of aluminum oxide reacts with 7 moles of iron...

What is iron?

500

When copper (II) chloride reacts with sodium nitrate, copper (II) nitrate and sodium chloride are formed. 

If 15 g CuCl2 (MM=134.45 g/mol) react with 20. g NaNO3 (MM=85.00 g/mol), this is how much sodium chloride (MM = 58.44 g/mol) that can be formed.

What is 13.0 g NaCl?

500

This questions is worth 1000 points! SURPRISE! Chlorine gas reacts with potassium bromide to produce potassium chloride and bromine liquid. This is the number of grams of potassium chloride that can be produced from 300. g each of chlorine and potassium bromide.

What is 188 g KCl?