EXTRA CREDIT: Last Chance for Winter Term!

Please watch only the first two videos (the one with the student sitting in the water tank, and the one with the hand holding the concrete cube). Watching the other videos will be a waste of time. Remember: you are allowed to take notes on a 3 x 5 index card and use it on the quiz. These two videos are excellent and are very likely to help you formulate a better understanding of density. You only need to watch the concrete cube video to the 8:10 mark. Good luck.

How many substances?

Can you identify how many substances are represented on this graph? What are the similarities and differences? What can these things tell you about the types and amounts of substances?

Phase Change Quiz Next Week

Be sure to check the Downloads on the Thayer website for the freezing point and boiling point graphs available there. For next week's quiz you have to understand that the plateaus on these graphs indicate a phase change (melting, boiling, freezing, etc.). These plateaus should not be confused with plateaus due to ambient temperatures (room temperature, freezer temperature, etc.). You should understand that temperature DOES NOT CHANGE during a phase change, and you should know how to recognize these phase changes on the graphs. Use the upper case letters at the top of the graphs to help you identify times when:
¤ only liquid is present
¤ only solid is present
¤ both liquid and solid are present
On the quiz you will be asked to identify these areas on the graph. You should be able to keep track of the phase (solid, liquid, gas, etc.) of a substance by following its temperature on a phase change graph (temperature as a function of time). Also, remember that freezing point, melting point and boiling point are characteristic properties of substances and do not depend on the amount of substance present. Please reread pages 58 and 59 in your Lab Manual and be sure that you know the answers to all of the questions based on the data we collected in the lab.

Earning Points on the PowerPoint Presentation:

Although the PowerPoint Presentations will not be graded until next trimester, it is important to know how you and your group will be evaluated. Please check out this simple rubric to view the categories and possible points that can be earned for each category listed in the table. . .

Week of 2/18--Power Point Presentation Work. . .

This week we'll use our class time to begin working on the oral presentations we'll make as part of the group project experience. You should communicate within your groups to determine who will be responsible for the following slides:

• 1 title slide
• 1 slide for SoP and Hyp.
• 1 or more slides to provide history and background information (think Lit Review)--these slides will require the most time and effort
• 1 slide for safety precautions
• 1 or more slides to explain the procedure
• 1 or more slides to display the data--must include at least one graph
• 1 slide to summarize the conclusion

Remember that this is a visual presentation and should rely mainly on pictures and diagrams. Very few audience members want to hear you read words off of your slides--think pictures, diagrams, visuals of all types. Things will run smoothly if you come to school on Wednesday with a PLAN!

Group Project Experiments--This Week!

Please remember to bring in all materials that you will need for your group experiments. According to the timetable, this week will be used for experimenting and data collection. Come prepared and be ready to get down to businesss. You will also need your Project Logbook for keeping track of your data. Happy experimenting!

Sample Literature Review (for your convenience)