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Unit 4 - Chemical Reactions

AP Chemistry

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4.0 Unit 4 Overview: Chemical Reactions

According to the College Board, "This unit explores chemical transformations of matter by building on the physical transformations studied in Unit 3. Chemical changes involve the making➡️⬅️ and breaking⬅️➡️ of chemical bonds. Many properties of a chemical system can be understood using the concepts of varying strengths of chemical bonds and weaker intermolecular interactions. When chemical changes occur, the new substances formed have properties that are distinguishable from the initial substance or substances.

Introduction to Acid/Base Reactions

Learn about acids and bases and how they react with each other.

Stoichiometry (Part 3) - Slides

Browse slides from the stream 'Stoichiometry (Part 3).'

Stoichiometry (Part 3)

In this stream, we will review the concept of Molarity, and learn how to calculate the Molarity of Ions in Solutions. During this stream, We will also practice the Stoichiometry of Solutions with a few problems.

Introduction to Titrations - Slides

Browse slides from the stream 'Introduction to Titrations.'

Introduction to Titrations

Learn about titrations and how to determine the molarity of a solution at the equivalence point.

Stoichiometry (Part 2)

We go over Gas Stoichiometry. We discuss how STP, limiting reactants, the Ideal Gas Law, and gas collection over water factors into Gas Stoichiometry. We also work through practice problems to see the concepts in action!

Stoichiometry (Part 2) - Slides

Browse slides from the stream 'Stoichiometry (Part 2) .'

Stoichiometry (Part 1)

In this stream, we will learn the basic concepts of stoichiometry. Limiting and Excess reactants are going to be reviewed, and we will work together some practice problems.

Stoichiometry (Part 1) - Slides

Browse slides from the stream 'Stoichiometry (Part 1) .'

Net Ionic Equations

Solubility, molecular equations, complete equations, net ionic equations, applications to acid/base reactions

Introduction to Chemical Reactions

This stream defines the evidence for a reaction as well as different ways to identify the different types of reactions.

📝study guide

4.1 Recognizing Chemical Reactions

From electronic devices📱 to fizzy soda🥤, our world runs on chemical reactions. So what happens in chemical reactions? In a simplified definition, specific interactions with molecules result in the rearrangement of atoms to create new molecules. However, this magic✨ has restrictions, as will be discussed in the next sections.

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4.2 Net Ionic Equations

When dealing with chemical reactions, it is important to understand that, at least for the case of AP Chemistry, the vast majority of them will be taking place in an aqueous solution, that is, dissolved in water💧. Therefore, we will not be dealing with molecules, but rather their constituent particles that are created when they dissolve.

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4.3 Balancing Chemical Equations

Just as net ionic equations provide information about interactions with ions in aqueous solutions, chemical reaction equations are a great way to visually track physical changes and chemical reactions. However, before we can examine these equations to observe these changes, we need to learn how to properly set up the equation for a chemical reaction. In other words, we need to learn how to balance equations. If an equation isn’t balanced, our answers will be incorrect. But why is it bad if it’s unbalanced, and how can we learn to balance equations easily?🤔

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4.4 Physical vs. Chemical Changes

Chemical equations show the products that the combination of reactants yield, but the equation doesn’t show how the reactants form those products. What we don’t see are the underlying chemical and physical changes that allow molecules to rearrange to change properties or create new substances.

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4.5 Stoichiometry & Calculations

In the previous section, we looked at qualitatively analyzing chemical reactions. Now, we’ll learn how to quantitatively analyze reactions using stoichiometry! It may seem like a lot of math at first, but once you do more practice, you’ll be more confident and become a stoichiometry master 👨‍🏫

📝study guide

4.6 Titrations - Intro and Calculations

Titrations are an experimental method🧪 used to analyze acid-base reactions. The image below shows a set up of the apparatus.

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4.7 Precipitation Reactions

If you recall, precipitation reactions are one of the main three you should know for this unit. Let's review it once more!

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4.8 Intro to Acid-Base Neutralization Reactions

The second main type of reaction that you learn in this unit is the acid-base neutralization reaction🍊.

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4.9 Redox Reactions

The last type of reaction in this unit are oxidation-reduction reactions, commonly called redox. These reactions deal with the transferring➡️ of electrons, which causes molecules to change oxidation states.

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Free Reviews 2020

13 resources

Free Response Questions

2 resources

Unit 1 - Atomic Structure and Properties

26 resources

Unit 2 - Molecular and Ionic Compound Structures and Properties

20 resources

Unit 3 - Intermolecular Forces and Properties

37 resources

Unit 4 - Chemical Reactions

21 resources

Unit 5 - Kinetics

16 resources

Unit 6 - Thermodynamics

10 resources

Unit 7 - Equilibrium

3 resources

Unit 8 - Acids and Bases

3 resources

Unit 9 - Applications of Thermodynamics

0 resources

Introduction

2 resources

AP Chemistry Essentials

4 resources

Multiple Choice Questions

1 resource

Blogs

15 resources

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