The APsolute RecAP: Chemistry Edition
Melanie Kingett, Sarah Rayder, Brad Kingett, Zach Caruso
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Top 10 The APsolute RecAP: Chemistry Edition Episodes
Goodpods has curated a list of the 10 best The APsolute RecAP: Chemistry Edition episodes, ranked by the number of listens and likes each episode have garnered from our listeners. If you are listening to The APsolute RecAP: Chemistry Edition for the first time, there's no better place to start than with one of these standout episodes. If you are a fan of the show, vote for your favorite The APsolute RecAP: Chemistry Edition episode by adding your comments to the episode page.
The APsolute RecAP: Chemistry Edition - pH and pOH
The APsolute RecAP: Chemistry Edition
02/22/21 • 10 min
We are starting with a recap of episode 35 and are defining acids and bases and their connection to pH and pOH (1:02). Taking a closer look at the pH scale, our episode discusses the use of logarithm for pH and pOH (1:53). This lays the foundation for the calculation of pH and pOH for strong acids and bases. For weak acids and bases the episode draws the connection back to equilibrium and introduces the acid/base ionization constant (3:10), which is needed together with the initial concentrations to calculate the pH of a weak acid/base (6:08).
Question: You have a 0.1 M sulfurous acid solution. If at equilibrium you have a [H+] = 8.4 x 10-3 M, what is the percent ionization?
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The APsolute RecAP: Chemistry Edition - Acids and Bases - The Basics
The APsolute RecAP: Chemistry Edition
02/15/21 • 10 min
We start our recap with a recap: What are acids and bases and acid-base reactions (1:03)? Diving a bit deeper, we take a closer look at the dissociation of acids (2:20), which releases H+ ions and therefore lowers the pH. Vice-versa we look at the dissociation of bases in water (3:34 ) and it’s connection to pOH and pH (3:34). Taking a closer look at water, which is an amphoteric substance (4:16), the episode introduces the autoionization of water (5:56) and the equilibrium constant: KW (6:35) and ties it to pH and pOH (7:29).
Question: At a higher temperature, will the pH of a neutral solution be higher, lower or equal to pH=7?
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The APsolute RecAP: Chemistry Edition - Solubility Equilibria
The APsolute RecAP: Chemistry Edition
02/08/21 • 8 min
Our episode starts with addressing the question: What IS solubility? (1:19). The episode introduces solubility equilibria with respect to the Solubility-Product Constant, K, expression (1:57) and discussion how its magnitude relates to solubility (3:05). If you have the Ksp you can calculate the molar solubility - in mol/L - as well as the mass solubility in g/L (4:35). Comparing K to Q let’s you determine if a precipitate forms (5:58).
Question: How does a common ion affect the solubility of a salt?
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The APsolute RecAP: Chemistry Edition - Le Chatelier’s Principle
The APsolute RecAP: Chemistry Edition
02/01/21 • 8 min
Let’s be disruptive: What happens when you disturb the equilibrium of a chemical reaction? Our episode talks you through several different scenarios and their effect on the reaction as well as K and Q: We can add reactant and product (2:01) or remove reactant and products (2:58). We can also change the temperature of our reaction and either add heat (4:29) or lower the temperature (5:35). If we have gaseous, we can also change the pressure by changing the volume of the container (5:59).
Question (7:48): Which reaction is favored if you decrease the volume and have the same number of gaseous particles on reactant and product side?
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The APsolute RecAP: Chemistry Edition - Equilibrium Constant
The APsolute RecAP: Chemistry Edition
01/25/21 • 9 min
Try to keep your balance! The episode starts with an analogy of villagers commuting from Moleville to Chemtown (0:59). Tying it to a chemical reaction, we define equilibrium as the point where the rate of the forward and the rate of the reverse reaction are the same (1:43). To determine if, at equilibrium, a reaction has more reactants or products, we can calculate the equilibrium constant, capital K (3:59) and write the equilibrium expression (4:34). The magnitude of K tells us if a reaction favors the products or the reactants (5:35). To determine if a reaction is at equilibrium, we can calculate Q (6:12).
Question (8:14): The equilibrium constant for a known reaction is K = 150. What would the value for K’ be if you’d reverse the reaction at the same temperature?
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The APsolute RecAP: Chemistry Edition - Enthalpy
The APsolute RecAP: Chemistry Edition
01/18/21 • 10 min
Heat, Energy and now Enthalpy? What is going on? Our episode starts by defining and distinguishing between these concepts (0:54) before taking a closer look at enthalpy itself. The episode connects the mathematical sign of enthalpy to the heat being absorbed / released (1:39) and discusses the extensive character of enthalpy (2:06) as well the value of reversed reactions (2:23) and its dependency on the state (2:47). We also recap two approaches to calculate the enthalpy of a reaction: taking into account the bonds broken and bonds formed (3:06) as well as the standard enthalpies of formation (5:25). To clarify the calculations using the standard enthalpies of formation, we discuss the combustion of propane (7:10).
Question (9:20): What is the law called that allows us to use the sum of enthalpy changes, independent of the steps?
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The APsolute RecAP: Chemistry Edition - Episode 62: Molecular Structure and Acid Strength
The APsolute RecAP: Chemistry Edition
01/31/22 • 10 min
All hydrohalic acids, but hydrofluoric acid, are strong acids. Why is that (0:31)? Strong acids fully dissociate and have a large Ka, weak acids only dissociate to a small percentage (1:20). When looking at strength, we are comparing the stability of the conjugate acid/base pair partners (2:00). For binary acids across a period (2:37) as well as down a group (3:09) electronegativity determines acid strength. For oxyacids, we can compare acids with different numbers of oxygen atoms, which affects the inductive effect, as well as resonance structures (4:58). We can also discuss acid strength across a period (6:44) and down a group (7:34). Bases are proton acceptors. Common bases are conjugate bases of weak acids, like carboxylic acids, and amines (7:53).
Question of the Day: Acid A has a Ka = 3.5 x 10-8, acid B has a Ka = 1.2 x 10-2. Which acid is HClO, which one is HClO2?
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The APsolute RecAP: Chemistry Edition - Episode 61: Unit 7 Selected FRQs
The APsolute RecAP: Chemistry Edition
01/24/22 • 12 min
The FRQ questions on the AP exam often combine content from two or three different units. In today’s episode, we are emphasizing questions that require knowledge and skills from Unit 7: Equilibrium. You will rarely find an FRQ that solely focuses on Unit 7, since it lays the foundation for Unit 8, acids and bases as well as parts of Unit 9, Application of Thermodynamics. It also links back to concepts from earlier units, like gas laws. The questions we are using today are online accessible. Our suggestion: Answer the questions yourself and then listen to this episode to hear the explanations, as well as do’s and don'ts for answering questions of Unit 7. We will review 2016 - Question 6, 2015 - Question 4 and 2014 - Question 4. These are released FRQs from previous exams and copyright of the College Board.
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The APsolute RecAP: Chemistry Edition - Episode 60: Factors Affecting the Dissolution of a Salt
The APsolute RecAP: Chemistry Edition
01/18/22 • 9 min
This episode is an application of earlier discussed concepts. In episode 33 we talked about disruptions affecting equilibrium: concentration, temperature and pressure. In episode 34, solubility equilibria, we talked about the dissolution of a salt. In this episode we set our focus a bit differently: We look at environmental factors, like pH or other dissolved ions and how they affect the dissolution of a salt. pH was a concept introduced in Unit 4 with more in depth coverage in unit 8 It's all connected. So, let’s recap the recaps that lay the foundation for this episode, then introduce the new concepts and dive into how these factors affect the dissolution of a salt.
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The APsolute RecAP: Chemistry Edition - Acid-Base Titrations
The APsolute RecAP: Chemistry Edition
03/01/21 • 8 min
Acid-base titrations are an experimental approach to determine the concentration of an unknown acid or base (0:56). Your episode starts by introducing the terms analyte and titrant (1:49) and looks at two examples: In the first example, we are titrating a strong acid with a strong base (2:03). We describe the shape of the titration curve (2:14) and define equivalence point (2:44), the point at which the number of moles of titrant and number of moles of analyte are the same. Using the equivalence point, we can calculate the molarity of the unknown analyte (3:03). The second example outlines the titration of a weak acid with a strong base (4:26) and describes why the equivalence point is at a pH higher than 7 (5:19). It also discusses the half-equivalence point (6:00), which can be used to determine the pKa of the weak acid.
Question: How many equivalence points will the titration curve of a diprotic acid show?
Thank you for listening to The APsolute RecAP: Chemistry Edition!
(AP is a registered trademark of the College Board and is not affiliated with The APsolute RecAP. Copyright 2021 - The APsolute RecAP, LLC. All rights reserved.)
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FAQ
How many episodes does The APsolute RecAP: Chemistry Edition have?
The APsolute RecAP: Chemistry Edition currently has 63 episodes available.
What topics does The APsolute RecAP: Chemistry Edition cover?
The podcast is about How To, Chemistry, Courses, Podcasts and Education.
What is the most popular episode on The APsolute RecAP: Chemistry Edition?
The episode title 'The APsolute RecAP: Chemistry Edition - Episode 61: Unit 7 Selected FRQs' is the most popular.
What is the average episode length on The APsolute RecAP: Chemistry Edition?
The average episode length on The APsolute RecAP: Chemistry Edition is 9 minutes.
How often are episodes of The APsolute RecAP: Chemistry Edition released?
Episodes of The APsolute RecAP: Chemistry Edition are typically released every 7 days.
When was the first episode of The APsolute RecAP: Chemistry Edition?
The first episode of The APsolute RecAP: Chemistry Edition was released on Jul 8, 2020.
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