Stoichiometry

Week 25 Chemistry

Warm Up: 7 Minutes

You should be working SILENTLY

Stay in your own seat

Classify each of the following reactions. Explain how you know using specific parts of the reaction. 

2 C2H6 + 7 O2 4 CO2 + 6 H2O

H2 + Cl2 2 HCl

2 AgNO3 + Ni Ni(NO3)2 + 2 Ag

Fe(OH)2 FeO + H2O

2 NH4Cl + Hg(C2H3O2)2 2 NH4C2H3O2 + HgCl2

Write the Learning Target

Agenda

Warm Up [12 minutes] Chemical Reactions Essay [38 minutes] Closing [3 Minutes]

About the Prompt

Every year, you are required to create a writing sample in your classes

This is the day for our prompt in Chemistry

Expectations

It should be SILENT during the writing time

This means no talking, noises, or being out of your seat.

Your PromptOn your provided handout, answer the prompt below:

Two chemical reactions are shown below.

Zn + 2 HCl ZnCl2 + H2 

FeS + 2HCl FeCl2 + H2S

Write an essay that addresses the following to receive full credit:

Why are all chemical reactions considered to be chemical changes?

Classify each reaction and provide support for its classification.

How are the given reactions similar to each other and how are these reactions different from each other?

Close all laptops

Closing

How do you feel about types of reactions?

Warm Up: 4 Minutes

You should be working SILENTLY

Stay in your assigned seat

Calculate the molar mass of the following compounds:Hint: add the masses of the elements… N2O3

Ba(OH)2

Write the Learning Target

Agenda

Warm Up [7 minutes] Notes/Examples [15 minutes] Guided Practice [12 minutes] Independent Practice [17 minutes] Closing [2 Minutes]

What have we learned so far?

Mole to Mole

Mole X Mole Y

Today’s Stoichiometric focus

Mole to Mass

Mole X Mole Y Mass Y

You will need…

Periodic TableCalculator

Guaranteed method for success

How to Perform Stoichiometry Mole to Mass problems?

1. WRITE and BALANCE the equation

2. Write down GIVEN number AND unit

3. Write down MOLE RATIO with UNKNOWN on top and GIVEN on bottom

4. Use MOLAR MASS of the unknown to solve for grams

5. MULTIPLY the numbers on TOP6. DIVIDE by the numbers on the

BOTTOM

Example 1

Iron reacts with Oxygen to form Iron (III) Oxide. How much (mass) of Oxygen gas was produced from 4 moles of Iron (III) Oxide?

___Fe + ___O2 ___Fe2O3

Step 1: Write and Balance the EquationStep 2: Write down GIVEN number AND unit Step 3: Write down MOLE RATIO with UNKNOWN on top and GIVEN on bottomStep 5: MULTIPLY the numbers on TOPStep 6: DIVIDE by the numbers on the BOTTOMStep 4: Use MOLAR MASS of the unknown to solve for grams

When an electrical current is passed through a sample of water, hydrogen and oxygen gases formed. Determine the mass of water required to decompose to form 3.4 moles of hydrogen.

___H2O ___H2 + ___O2

Example 2

Guided Practice

Teacher:

1. Will show the problem on the board Students:

1. Take 27 seconds to read the problem and write your given and unknown

2. Take 78 seconds to solve the problem with your shoulder partner

3. Be ready to share when Mr. Ghosh says SWAG

Guided Practice #1

Hydrogen and nitrogen gases react to form ammonia by the reaction below:

___H2 + ___N2 ___NH3

If 0.99 moles of ammonia are formed, determine the mass in grams of hydrogen gas that reacted.

3.0 grams H2

Guided Practice #2

Potassium metal reacts with chlorine gas to produce potassium chloride by the reaction below:

___K + ___Cl2 ___KCl

If 4.50 moles of chlorine reacts, how many grams of potassium chloride are produced?

671 grams KCl

Independent Practice

Take some time to practice some mole to mass stoichiometry

Practice makes Perfect

85%

Closing

Describe the process used to solve mole to mass stoichiometry problems

Warm Up: 4 Minutes

You should be working SILENTLY

Stay in your own seat

When an electrical current is passed through a sample of water, hydrogen and oxygen gases formed. Determine the mass in grams of oxygen required to decompose to form 12 moles of water.

___H2O ___H2 + ___O2

 

Write the Learning Target

Agenda

Warm Up [7 minutes] Notes/Examples [15 minutes] Guided Practice [12 minutes] Independent Practice [17 minutes] Closing [2 Minutes]

Today’s Stoichiometric focus

Mass to Mole

Mass Y Mole Y Mole X

Example 1

How many moles of O2 are required to react with 400g of C4H10?

2 C4H10 + 13 O2 8 CO2 + 10 H2O

How many moles of copper are required to form 163.0 grams of nitrogen monoxide, assuming an excess of nitric acid?

3 Cu + 8 HNO3 3 Cu(NO3)2 + 4 H2O + 2 NO

Example 2

Guided Practice

Teacher:

1. Will show the problem on the board Students:

1. Take 27 seconds to read the problem and write your given and unknown

2. Take 78 seconds to solve the problem with your shoulder partner

3. Be ready to share when Mr. Ghosh says SWAG

Guided Practice #1

Water and nitrogen monoxide are produced from the reaction of ammonia and oxygen according to the reaction below:

4 NH3 + 5 O2 6 H2O + 4 NO

If 37.2 grams of NH3 are reacted, how many moles of water are produced?

3.28 moles H2O

Guided Practice #2

Sodium hydroxide and sulfuric acid react to form water and sodium sulfate according to the reaction below:

2 NaOH + H2SO4 2 H2O + Na2SO4

If you start with 2.41 moles of sodium hydroxide and an excess of sulfuric acid, how many grams of sodium sulfate will be formed?

171 grams Na2SO4

Independent Practice

Take some time to practice some mass to mole stoichiometry

Practice makes Perfect

85%

Closing

Describe the process of converting from mass to mole.

How do you distinguish between mass to mole and mole to mass?

Warm Up: 5 Minutes

You should be working SILENTLY

Stay in your own seat

Calculate the number of moles of NH3 produced by the reaction of 6.2 grams of hydrogen with an excess of nitrogen.

N2 + 3 H2 2 NH3

 

Write the Learning Target

Agenda

Warm Up [7 minutes] Notes/Examples [15 minutes] Guided Practice [12 minutes] Independent Practice [17 minutes] Closing [2 Minutes]

Today’s Stoichiometric focus

Mass to Mass

Mass X Mole X Mole Y Mass Y

Example 1

Calculate the number of grams of NH3 produced by the reaction of 5.40g of hydrogen with an excess of nitrogen. The balanced equation is

N2 + 3 H2 2 NH3

Acetylene gas (C2H2) is produced by adding water to calcium carbide (CaC2). How many grams of acetylene are produced by adding water to 5.00 grams CaC2?

CaC2 + 2 H2O C2H2 + Ca(OH)2

Example 2

Guided Practice

Teacher:

1. Will show the problem on the board Students:

1. Take 27 seconds to read the problem and write your given and unknown

2. Take 88 seconds to solve the problem with your shoulder partner

3. Be ready to share when Mr. Ghosh says SWAG

Guided Practice #1

The combustion of acetylene follows the reaction shown below:

2 C2H2 + 5 O2 4 CO2 + 2 H2O

If 52.00 grams of C2H2 are burned, how many grams of oxygen are required?

159.8 grams O2

Guided Practice #2

Lithium nitride reacts with water to form ammonia and lithium hydroxide:

Li3N + 3 H2O NH3 + 3 LiOH

What mass of water is required to react with 32.9 grams of Li3N?

51.1 grams H2O

Independent Practice

Take some time to practice some mass to mass stoichiometry

Practice makes Perfect

85%

Closing

What steps would you take to perform a mass to mass stoichiometry problem?

Warm Up: 7 Minutes

You should be working SILENTLY

Stay in your own seat

Barium Chloride reacts with Silver (I) Nitrate to form Barium Nitrate and Silver (I) Chloride.

___BaCl2 + ___AgNO3 ___Ba(NO3)2 + ___AgCl If 115.4 grams of barium chloride are consumed, how many grams of silver (I) chloride are produced?

Write the Learning Target

Agenda

Warm Up [11 minutes] Quiz [30 minutes] Closing [4 Minutes]

Material Covered on Quiz

All types of Stoichiometry!Mole to MoleMole to MassMass to MoleMass to Mass

Goal

To demonstrate mastery, we are shooting for

85%

Check Point

What is your goal for this quiz?

85%

Expectations for Quiz

Clear your desk of everything except a....

1. Writing Utensil

2. Calculator

Periodic Table will be provided to you

Expectations

Students will keep eyes on own paper

Cheating will result in an automatic ZERO Students will remain SILENT for the duration of the

quiz

Good Luck!!

Closing

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