Reflection: Homework Changing Matter: Is Weight the Same or Different? - Section 5: Wrap Up


Comparing Results With Graphs: 

Students analyzed their data and created a graph to illustrate their data for homework.  I reviewed graphs the following day and used a couple as examples to share with the whole class.  By using the data to create a graph, students are demonstrating an understanding of what the data really means.  They are able to illustrate their data to show others what happened in the experiment.  If there are errors in graphing that would indicate to me that the student does not understand the data they are graphing.  For example, if their data shows that there was no change, but they draw bars that are not equal, that means that they are not aware of what the data indicated happened in the investigation.  Being able to transfer the data from the data chart to a graph helps verify their ability to analyze what really happened.  

Having students graph the data also helps align the activity with standard 5-PS1-2: Measure and graph quantities to provide evidence that regardless of the type of change that occurs when heating, cooling, or mixing substances, the total weight of matter is conserved.  

Reflecting on Errors: 

I could easily see in the graphs where there were errors made because all graphs should have showed that the three bars were relatively close to each other (maybe 1 or 2 grams off).  If there was a big difference in the level of the bars for the same substance, I questioned the group on what errors may have occurred.  

One group noted that I spilled the butter, and another group noted in their error section that one of the group members stuck their finger in the chocolate.  I did have several groups find that the weight of the butter changed about 5 -10 grams after it was refrozen.  They could not identify an error so we discussed why this may have happened.  Some thoughts were that the oil separated out of the butter when it was heated.  Another group thought is may have to do with the fact that some of the butter formed a foamy layer on top which may weigh less.  


  Analyzing Results and Reflecting on Errors
  Homework: Analyzing Results and Reflecting on Errors
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Changing Matter: Is Weight the Same or Different?

Unit 2: Matter and Its Interactions
Lesson 4 of 10

Objective: SWBAT provide evidence to support their conclusion that the amount of matter present is conserved or is not conserved when matter changes state.

Big Idea: Students conduct a hands on investigation to determine how matter, changing state, effects the property of weight.

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