8/2/2019 Midterm # 3 Study Guide

1/2

Study Guide

Midterm # 3

Chapter 4:

Mole Concept

See problem 2.25

Using Mole Map Be able to convert gram, moles and # of particles. See Slide # 23 of Ch 4

lecture slides

Stoichiometry: See Slide # 25 of Ch 4 lecture slides. Look at examples from text. Problems 45-47

Limiting Reactants:See lecture slide # 31 of Ch 4

Calculate % yield: See slide 32 and 33

RedOx Reactions: Substance oxidized/substance reduced: Lecture slide # 36. Problems 72,73 in text

Chapter 6: Solutions

Terminology: (slide 2)

Identify solute/solvent How are solutions separated into components in the lab (review Separation of Mixture lab)

Like dissolves Like

How do you pick a good solute/solvent pair (problems 6.25-6.28) Why do ionic compounds such as LiF dissolve in water? (slides 6-7)

Molarity:

Calculate molarity: 23.8 g of C6H12O6 dissolved to a total volume of 250 mL. What is themolarity?

Calculate volume: What volume of 12.0 M HCl contain 2.50 grams? Dilution: 3.0 mL of 12.0 M HCl is dilute to a total volume of 250 mL. What is the concentrationof the diluted solution? See problems: 6.39,6.45,

Chapter 7

What is an equilibrium constant and how is it used (section 7.6)

8/2/2019 Midterm # 3 Study Guide

2/2

Meaning of large values of K or very small values of K Does the equilibrium lie to the left or to the right? See box on pg 227 ofHow tp

Chapter 8

Acids are proton donors, bases are proton acceptors Understand what it means to be a strong vs weak acid Given an acid/base reaction , identify the acid, base, and conjugate acid, conjugate base

(Section 8.3)

o How does the strength of an acid relate to the strength of its conjugate base? (example8.2)

What does the term amphoteric mean. Show how water is amphoteric. Be able to give atleast one other example of an amphoteric substance. (For our purposes, amphoteric and

amphoteric are equivalent concepts)

Nomenclature of Acids (see How to section 8.3, pg 246) practice using quizlette Given Ka, Calculate pKa Use values of Ka (or pKa) to determine strength of an acid. See examples 8.3 and 8.4 of text Kw=[H3O+][OH-]=1X10-14

o See example 8.5 Given H3O+, calculate pH [H3O+]=10-pH

o See example 8.6 Given pH, calculate pOH pH+pOH=14

o See example 8.7 Titration Calculations:

o Section 8.9 Look at problem 8.46o Slides 37-42o Review Titration of Vinegar lab. Do your calculations!