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100

Define stoichiometry.

A) A section of chemistry related to stocks

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

C) A section of chemistry that studies the chemistry of molecular subunits.

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

100

What is a limiting reagent/reactant?

-A reactant that gets consumed first in a chemical reaction

100

What is an excess reagent? 

A reactant that is not completely used up once the reaction finishes AKA left over

100

What is the mole ratio between oxygen and magnesium oxide below?

2 Mg + O2  →  2 MgO

1:2

100

Define theoretical yield.

Amount of product that is expected to be produced in a reaction (in theory, on paper).

200

Is this true about stoichiometry? A chemical reaction does not have to be balanced first in order to complete a stoichiometry problem.

False

200

What is the Percent Yield formula?

Actual/Theoretical  X 100%

200

Maximum amount of product that can be produced is the same as ____

Theoretical Yield

200

Define mole ratio.

A) The ratio between the amount of moles that two compounds have in a reaction

B) The ratio between the distance of moles of an element from its surroundings

C) The ratio between the mass of moles that three compounds have in a reaction

A) The ratio between the amount of moles that two compounds have in a reaction

200

Which of these measurements are used in stoichiometry?

A) Moles

B) Mass

C) All of the above

C) All of the above

300

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

2 Mg + O2  →  2 MgO

Mg

300

How many moles of KClO3 must decompose to make 9 moles of O2?

2 KClO3 → 2 KCl + 3 O2


6 moles

300

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

 

True

300

Define experiemental yield.

 

The amount of product you actually make during a lab experiment. (also known as actual yield)

300

Which of the below is true for limiting reagents?

A) It is consumed in a chemical reaction until a certain point

B) It is fully consumed

C) It is consumed and it turns into excess reagents as waste

B) It is fully consumed

400

If you react 75 moles of Mg with 50 moles of O2, how much MgO can be produced?

2 Mg + O2  →  2 MgO

75 MgO

400

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

4 Al + 3 O2 → 2 AlO3


9.0 moles

400

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

58.3 g/mol

400

From the equation N2 + 3 H2 → 2 HN3, how many moles of HN3 are created if you are given 100 moles of H2?

150 moles

400

You are making cheese burgers for our class. To make 1 cheese burger, you need 2 buns, 1 piece of cheese, and 1 burger. 

You are given 60 burger buns, 25 pieces of cheese, and 30 burgers. How many cheese burgers can you make and what is your limiting reactant?

25 cheese burgers - LR is the cheese

500

35 moles of KClO3 decompose into how many moles of KCl?

2 KClO3 → 2 KCl + 3 O2

35 moles

500

On paper, you predict you should be able to make 65.7 moles of oxygen gas. When you complete the lab during class, you only produce 43.25 moles of oxygen gas. What is the percent yield? (Round up to the nearest percentage)

66%

500

True or false. You want your percent yield to be as low as possible. 

False - You want it to be close to 100% as much as possible!

500

If you react 45 moles of Mg with 20 moles of O2, which one is the excess reagent?

2 Mg + O2  →  2 MgO

Mg