Home

Unit 11 - Solutions

This is another lab intensive unit of study.

Make every effort to be present all days of lab noted below on the calendar.

Graph paper is necessary for completion of the labs and homework assignments. Obtain graph paper now at the beginning of the unit.

 

Goals


You will be able to...
  1. Describe the mechanism of dissolving at the molecular level, including kinetic energy and ion formation &/or polar and hydrogen bonding.
  2. List and describe factors that determine how fast a soluble substance dissolves for both gases and solids.
  3. Explain what is meant by the concentration of a solution.
  4. Explain the difference between saturated, unsaturated, and supersaturated solutions.
  5. List and describe colligative properties of solutions
  6. Define and work problems involving the molarity, molality and percent composition of a solution. Understand how to dilute stock solutions.

 

Text Assignments:

Create note pages for Sections 1 - 4 as in the last unit of study!

Cornell Style notes are due Wednesday, April 9, 2008

  1. Chapter 15 Section 1- 4. Read carefully, note vocabulary and answer 4,5,7. Page 461. Use Graph Paper!! Notes and problems due 4/9/08
  2. Chapter 15 Section 2 Focus on example problem 15-3 and answer 14,16,17 - Problems and worksheet due 4/22/08
  3. Chapter 15 Section 3-4 Calculations in these sections are optional
Monday Tuesday Wednesday Thursday Friday
6 7 8 9 10

13

 

14

Gas Law Lab Due

Solutions

HW: Answer Text Questions 4,5,7. Page 461. Use Graph Paper! Due Wednesday.

15

Pre-Lab Preparation - Write procedure for the lab.

Cornell Style Notes and Problems 4,5,7 Page 461 due for 50 points

HW: Complete writing procedure for the lab. Come prepared for a pre-lab quiz

16

Factors Affecting Solution Formation

17

Factors Affecting Solution Formation

20

Types of Concentrations

HW: Preparation for Solubility and Temperature Lab. You must answer Pre-lab questions before conducting the lab.

 

 

21

Concentrations Demonstration

 

 

HW:

22

Colligative properties

HW:

 

23

Vocabulary Quiz

Vocabulary list for Quiz Prep

 

HW: Lab Prep

24

Solubility and Temperature Lab

HW: Work on Lab report.

MIDTERM

27

Calculating Concentrations

HW: In text - review example problem 15-3 and answer 14,16,17. Complete Worksheet assigned in class

28

Solubility and Temperature Lab Due

Calculating Concentrations

HW: Practice Concentration Problems. Prepare for test.

29

Conclude and Review

 

HW: Prepare for test.

30

Solutions Unit Test

May 1



General outline - if you are missing some notes :

of the same things we cover -

 dbhs.wvusd.k12.ca.us/webdocs/Solutions/Intro-to-Solutions.html

 

You have to navigate a bit to get to this great overvie- click on "Mr. Guch Explains", then on "solutions and molarity"

 
http://www.chemfiesta.com/

 

Practice calculating molarity from moles and volume at:

 
http://science.widener.edu/svb/tutorial/molarity.html

 

These are a bit more complicated and good practice:

 
http://science.widener.edu/svb/tutorial/molarity2csn7.html

 

Need some help with solvation?

 
Looking for new website

 

Test yourself here:

 

Looking for new website

How to prepare for lab questions

 

Preparing for lab questions is much like writing a lab report. You write a lab report and use it to answer the questions. A lab report tells someone what the purpose, the method and results and the conclusions you draw from a lab activity. Well, isn't that what you need to answer questions about the lab activity?

 

Lab questions will be 5-10 questions that require you to understand what you did in the lab, why it was done and what you can learn from doing it. If the lab is quantitative, you can assume there will be calculations to perform similar to the ones you did to complete the activity. If the lab is qualitative, you can assume there will be questions that ask 'what does this information mean' in relation to the purpose of the lab.

 

Lab - Factors Affecting Solution Formation

  1. Be able to write the chemical formula for materials used.
  2. Be able to discuss what your observations let you assume about the three variables you tested.
  3. Apply the kinetic molecular theory and the process of dissolving to explain your observations (look over day 1 notes!!)
  4. Be able to explain your procedure clearly and concisely. Clearly means anyone and every one can follow what you say to do and concisely means you say it simply and with the fewest number of steps as possible while remaining clear. You give thought to sequencing, also.

    Supersaturation Demonstration

You will be asked to write about a demonstration you watch rather than an activity you perform. What do you need to write about something that happened that you cannot rewind or put on pause? I suggest taking notes. Be able to describe your observations, name and explain the principles discussed that underlie the observations and connect the principles to what we are studying and the point of watching such a demonstration.

Lab - Solubility and Temperature

  1. You must use graph paper to develop the data collected in lab. This data is necessary to answer the post-lab questions.
  2. Some of the questions will ask you to read your graph - interpolating and extrapolating for numerical answers.
  3. Some of the questions will ask you to use the graph to do some math - calculating concentrations, or predicting solubility (which is a concentration g/100g water).
  4. And of course some of the questions will ask 'what if' - as in "what if this happened in your procedure, what would be the impact on your observations or measurements".
  5. Be sure to know the vocabulary - saturated, unsaturated, supersaturated, solubility

Home