Stoichiometry

Part 1

100

Define stoichiometry.

1. -A section of chemistry related to stocks

2. -A section of chemistry that involves reactants and/or products in a chemical reaction to determine its quantitative data. 

3. -A section of chemistry that studies the chemistry of molecular subunits

2. -A section of chemistry that involves reactants and/or products in a chemical reaction to determine its quantitative data.

200

1.Is this true about stoichiometry? Stoichiometry is used to determine the quality of products and reactants that are needed or produced in a reaction?

False

300

2Mg + O₂ -->  2MgO

If you react 15 grams of Mg with 20 liters of O2, which one is the limiting reagent?

Mg

400

4LiNO₃ + Pb(SO₄)₂ -->  2Li₂SO₄ + Pb(NO₃)₄

How many grams of lithium nitrate will be needed to react with lead(IV) sulfate to produce 250 grams of lithium sulfate?

313.55 g

Part 2

100

What is a limiting reagent? 

1. -A reactant that gets consumed first in a chemical reaction

2. -A reactant that binds to an element first in a chemical reaction

3. -A reactant that determines the quality of a chemical reaction’s product

1. -A reactant that gets consumed first in a chemical reaction

200

What is the formula for Percent Yield?

Actual/Theoretical  X 100%

300

2KClO₃ --> 2KCl + 3O₂

How many moles of KClO₃ must decompose to make 9 moles of gaseous oxygen?

6 moles

400

4Al + 3O₂ --> 2Al₂O₃

How many moles of solid aluminum are required to produce 4.5 moles of aluminum oxide?

9.0 moles

Part 3

100

What is an excess reagent? 

1. -A reactant that is not completely used up once the reaction finishes

2. -The waste product of an element after fractional distillation

3. -An element that has a higher amount of protons in a chemical reaction

1. -A reactant that is not completely used up once the reaction finishes

200

Maximum Product is the same as ____

Theoretical Yield

300

Is this true? Mole ratios are found from coefficients of a balanced equation of a reaction. 

 

True

400

What is the molar mass of Mg(OH)2?

58.3 g/mol

Part 4

100

What is the molar mass of Calcium chloride(CaCl2)?

110.98 g/mol

200

Define mole ratio.

1. -The ratio between the amount of moles that two compounds have in a reaction

2. -The ratio between the distance of moles of an element from its surroundings

3. -The ratio between the mass of moles that two compounds have in a reaction

1. -The ratio between the amount of moles that two compounds have in a reaction

300

Is this true? You must convert grams to moles to do stoichiometry. 

 

True

400

From the equation N₂ + 3H₂ → 2HN₃, how many moles of hydrogen are needed to react with 1 mole of nitrogen?

3 moles

Part 5

100

When in doubt, go to ___

moles

200

Which of these measurements are used in stoichiometry?

1. -Moles

2. -Mass

3. -Volume

4. -All of the above

4. -All of the above

300

Which of the below is true for limiting reagents?

1. -It is consumed in a chemical reaction until a certain point

2. -It is fully consumed

3. -It is consumed and it turns into excess reagents as waste

2. -It is fully consumed

400

Which of these products is a product of stoichiometry?

1. -Soap

2. -Chocolate bars

3. -Gasoline

4. -All of the above

4. -All of the above