Unit 5: reactions

Big Idea: Reactions quantitatively describe the changing interactions between atoms.

NOTE - there are three parts to this unit

Part 1:

• Be able to write and balance chemical equations
• Be able to identify five general types of reactions
• Be able to write molecular, complete and net ionic equations
• Be able to predict the formation of a precipitate

Chemistry: Atoms First (OpenStax) (Chapter 7, sections 1 and 2)
Homework part 1: here

Sequence:

1. Write and balance reactions
2. Group activity to classify reactions - here
3. Practice balancing and classifying reactions - here
4. Precipitation lab - student version here - data sheet here

​
Vocabulary part 1:

• Chemical equation
• Catalyst
• Coefficient
• Balanced equation
• Synthesis (Combination) reaction
• Decomposition reaction
• Single- replacement reaction
• Activity series
• Double-replacement reaction
• Combustion reaction
• Spectator ion
• Complete ionic equation
• Net ionic equation

Part 2:

• Be able to use the mole to convert mass to numbers
• Be able to use Avogadro’s number to convert moles into numbers of items
• Be able to convert volume of a gas at STP to moles and vice-versa
• Be able to determine the percent composition of a compound
• Be able to determine the empirical formula of a compound
• Be able to distinguish between empirical and molecular formulas

Chemistry: Atoms First (OpenStax) (Chapter 2, section 4; Chapter 6, sections 1 and 2)
Homework part 2: here

Sequence

1. Mole Intro (slides below)
2. Molar mass - practice here
3. Mole conversions - practice here more practice here
4. Moles and formulas - activity here
5. Empirical formulas - Airplane activity here
6. Hydrates - practice here
7. Lab - formula of a hydrate - here​

Vocabulary part 2:

• Mole
• Avogadro’s number
• Representative particle
• Molar mass
• Avogadro’s hypothesis
• STP
• Molar volume
• Percent composition
• Empirical formula

​Part 3:

• Be able to describe conserved quantities in chemical reactions
• Be able to use mole ratios to solve stoichiometric problems
• Be able to identify the limiting reagent of a reaction
• Be able to calculate percent yield of a reaction

Chemistry: Atoms First (OpenStax)  (Chapter 7, sections 3,4,5)
Homework part 3: here
​
Vocabulary part 3:

• Stoichiometry
• Mole ratio
• Limiting reagent
• Excess reagent
• Theoretical yield
• Actual yield
• Percent yield

Videos:

• Haber process here
• Photosynthesis here

Sequence

1. Recall mole
2. Generating table of reaction information - explained here
3. Practice stoichiometry - here
4. Lab on using mole ratio to determine cation state - here
5. Start of limiting reagent with stoichiometry - here
6. Limiting reagents with stoichiometry - here

Key Objectives:  Reactions

Chemistry - Wilbraham et al (Pearson 2012)
Chapters:
    10,11,12
Good Problems to Master:
    10:53,55,58,60,61,62,65,66,69,70,75,77,78,83,84,88,93,104
    11: 34,35,39,40,41,42,43,45,47,48,49,50,54,55,56,58
    12: 39,40,43,44,47,49,51,54,55,56,58,59,61,62,63,68,73,79,81,97

Topics and slides

Writing reactions
- Chemical Rxns
- Types of Rxns
- Rxns in water

The Mole
- The Mole
- Mole relationships
- Empirical formulas

Stoichiometry
- Math of rxns
- Chemical calcs
- Limiting reagent