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Do Now: 6 minutes

- Get out your “Analyzing a Graph…” worksheet from yesterday.
- Find the poster your didn’t analyze.
- Finish the worksheet, and hand it in on the front table.
- Sit down, and take out your notebook. Copy the objective. Smile, it’s Friday!

Intensive vs. extensive properties

- Intensive property: a physical property that does NOT depend on how much of a substance you have.
- Ex: temperature, velocity, melting point
- Extensive property: a property that DOES depend on how much you have.
- Ex: mass, length, volume

Intensive or extensive?

- I weigh 130 pounds.
- The car is moving 50 miles per hour.
- The length of a marathon is 24.6 miles.
- The density of water is 1.0 g/mL
- Ice melts at 0oC.
- I drank one liter of soda. (burp!)

Density

- A physical property of matter
- The mass per volume of a substance.
- Units: g/mL or g/cm3
- 1 mL = 1 cm3

Calculate Density

- Mass = 10.0 g, volume = 20.0 mL
- 10.0 g, 5 cm3
- Calculate the mass of a sample of matter with a volume of 10.0 cm3 and density of 2.0 g/cm3
- Calculate the volume of a rock with mass 100.0 g and density 5.00 g/mL.

Homework

- Week 6 Homework, #5-6

The phenomenon

- In 1982, the density of pennies changed.

Your challenge:

- Determine, empirically, the density of pennies before and after 1982.
- Write a materials list and procedure. Include ALL your steps. Be thorough!
- Carry out your procedure.
- Record and organize data into a chart and graphs. Describe your data in a paragraph.
- Analyze your data in a paragraph.
- Make a conclusion summarizing your data and answering questions.

Some details

- How can you determine the volume of a penny?
- Displacement
- Calculate the density of 2, 3, …10 pre-1982 pennies, and 2, 3, …10 post-1982 pennies. Make a neat table and graph.

An example of a good table.Table 1: Mass, volume and density of pre-1982 pennies

Things to write in your notebook:

- An excellent materials list and procedure
- Complete data tables (title, headings, units, calculations, NEATLY!)
- Complete graphs: mass vs. volume and EITHER mass vs. density or volume vs. density, with title, axis labels and units
- A written description of your data.
- A written analysis of your data
- A conclusion based on guiding questions.

Your homework

- To write a lab report.
- First Draft (neatly hand-written or typed) due:

So, is density intensive or extensive? How do you know? Discuss your graph, and what a graph of the other type might look like.

By the end of class…

- Materials list and procedure (incl. how to make calculations!)
- Data table for pre- and post-1982 pennies
- 2 graphs: mass vs. volume AND either
- Mass vs. density OR volume vs. density
- With a sentence describing each graph.
- You can start an analysis and conclusion like we practiced yesterday.

Homework

- Week 6 Homework: #5-6
- 2 graphs: mass vs. volume AND either
- Mass vs. density OR volume vs. density
- With a sentence describing each graph.
- You can start an analysis and conclusion like we practiced yesterday.

With your group:

- Fix your graphs. Draw a best-fit line.
- Write a one-paragraph analysis for each graph. Describe BOTH lines for each graph.
- Trend
- Shape of line
- Outliers: points that are way off the line.

Title

- Your lab report should be titled with a title of your choosing.
- It should be relevant to the lab and should not just be the same as the title of a handout your teacher gave you.
- Do not have it on a separate title page.

Background Information

- Explain any important concepts that are central to understanding the experiment.
- In paragraph form, define any scientific terms necessary for understanding the lab.

Objective (NO hypothesis)

- Explain what the purpose of the experiment or what goals you have in completing the lab. What do you hope to accomplish?
- (No hypothesis)
- IV: number of pennies
- DV: density

Write a Lab Report

- Title (incl. name, data, partner’s names)
- Objective (no hypothesis)
- Background info (from notes, etc.)
- DUE TOMORROW

Procedure

- For a lab where you have designed the procedure, include a detailed and complete account of every single step you completed during the lab, including how to make calculations. Be sure to include proper names for pieces of equipment!
- If you have followed a procedure given by your teacher, write a summary of what you did. Do not rewrite the given procedure word for word.

Data and Results

- Include any charts, graphs, tables, technical drawings, observations, or diagrams in this section. Include a one sentence caption for each.
- Data should be presented neatly, and with the use of computer software when possible.
- If any calculations were necessary during this lab, include them here.
- DO NOT explain the data.

Analysis

- Describe any patterns or trends in the data. Point out any relevant characteristics and comparisons that you see. Do not attempt to explain them, simply note them.
- Note the existence of any data that does not seem to fit the overall patterns/trends.

Conclusions

- Draw conclusions from the patterns and observations you noted in the analysis section. Explain why the patterns you saw occurred.
- Was the experiment successful at completing the objectives above? Explain why or why not.
- Reflect on your hypothesis. Was it correct? Why or why not?
- Was there any significant error in your experiment? Propose some possible sources of error and explain how they might be improved.
- Answer questions (4) in lab handout in paragraph form.

On a separate sheet of paper…

- Write the first draft of your lab report.
- Work on your own.
- You may listen to music as long as I can’t hear it.
- Label each section.
- Be careful to include EVERY part listed in your lab report guide.
- First draft due: next Thursday, Oct. 22

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