Title: Measurement Quiz
1Measurement Quiz!
- What is 2.341 4.2?
- (Use the correct number of sig. figs!)
- 2. What is 2.34x10-6 3.515x10-7
- (Dont worry about sig. figs)
- 3. Convert 7.8 km to mm.
- (Show D.A.)
- 4. How many seconds are in 15 years?
- (Show your dimensional analysis work!)
- 5. 3 x105 x 5x103
2DENSITY AND BOILING POINT LAB
- LAB REPORT REQUIREMENTS
- PORTFOLIO EXPECTATIONS
3GRADES
- Portfolio - worth 150 points
- Abstract and Materials (20 points)
- Due Wednesday (8/22)
- Results and Discussion (30 points)
- Due Monday (8/27)
- Final Drafts (100 points)
- Anticipated to be due on Wednesday (9/4)
- Best if typed!
- Must be attached to rough drafts
4General Information
- Lab Reports should
- Be easy to read (Best if typed!)
- Convey essential information
- Be clearly labeled
- Contain the following parts
5The Abstract
- A short description of what was done in the
experiment - Background information about the scientific
concepts involved - Brief description of results
- A good abstract is approximately 3 paragraphs
that are seven to eight sentences each
6Hints on what to research
- Colligative Properties
- Properties that depend on the number of solute
particles present - The one we are focused on is called boiling point
elevation - Adding a solute to form a solution increases the
boiling point of a solvent - Applications
- Freezing-point depression (lowers temp. water
freezes) - Car applications
7Materials and Methods
- A list of procedures and equipment should be
included in this section. - The list does not have to be all inclusive but
should cover the major pieces of equipment and
important procedures followed in the experiment. - The objective is to provide enough information so
that the experiment can be duplicated.
8Results
- Contains
- Data (tables, etc.)
- Graphs
- Calculations
- Statistical analysis
- Care must be taken to label each of these
components - The report should include salt and D.I. water
boiling point graphs, and density calculations - Also, the class average, average deviation, and
percent error for the difference between salt and
D.I. water boiling points should be clearly
shown.
9Discussion
- Discussion should
- Describe the precision and accuracy of the
experiment - Discuss all possible errors
- 2 Major Types
- One directional
- Examples Calibration, Instrumentation error
- Examples Mistakes such as not reading mass
properly - Contain a Brief Conclusion
10Boiling Point Graphs
- Time vs. Temperature
- For both DI water and Saltwater solution
- Include variable and unit (Ex Time (s))
- Title
- Clearly labeled points
- Fill in curve
11Find Average Difference in BP
Example Difference in BP (ºC) 1 (Group 1) 2
(Group 2) 2 (Group 3) 3 (Group 4) 4 (Group
5) 5 (Group 6) 1 (Group 7) 18/72.6 ºC (Class
Avg.)
- Record the change in boiling point by other
groups. - Find the change by adding them and dividing by
the number of groups.
12Find Average Deviation
Example Continued Deviation in BP (ºC) 2.6-1
1.6 (Group 1) 2.6-20.6 (Group 2) 2.6-20.6
(Group 3) 2.6-30.4 (Group 4) 2.6-41.4
(Group 5) 2.6-5 2.4(Group 6) 2.6-11.6 (Group
7) 8.6 /7 1.2ºC (Avg. Deviation)
- Find the difference between each groups change
in temp. and the average change in temp. - Add these values and divide by the number of
groups to get the average deviation.
13Percent Error
- Find the Percent Error of your personal data and
the class average data. - The True change in boiling point with addition
of solute should have been an increase of 2.5ºC. - Find the percent error
- Error True Value Experimental Value
- True Value
Continuing with Example Class Error 2.5-2.6
x 100 4 2.5