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9/20 Mothball Phase Change Lab Read through the powerpoint and then fill out the survey on the blog.

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Presentation on theme: "9/20 Mothball Phase Change Lab Read through the powerpoint and then fill out the survey on the blog."— Presentation transcript:

1 9/20 Mothball Phase Change Lab Read through the powerpoint and then fill out the survey on the blog

2 We’ll be observing the physical property of the mothball changing states of matter (phase changes) You’ll have people – observing what the mothball looks like as it changes – Observe the temp as it changes – Checking the time – Recording data

3 2. Decide Duties on Friday scribe/writer/timer: records main points of lab – Has good handwriting data recorder: records data on data table data looker: reading the temperature hands/eyes: observe phase changes & moves apparatus *thermometer 3. In lab notebook  you’ll write down everyone’s name and their duty

4 4. All discuss & complete pre-lab in class. We want to see how a mothball (it looks like a gobbstopper but don’t eat it) can change from being a solid  liquid  gas then back to a liquid  solid

5 This is what you’ll be using Mothball Test tube Thermometer (not for stirring) Ring stand Heat stand Beaker Water Stopwatch (on phone or one of mine) Alcohol burner goggles

6 Procedures (don’t write) 1.Set up apparatus 2.Read initial temp on thermometer 3.Record temp and phase on data table 4. Observe Solid, Liquid,Gas 4. Start timer

7 Scribe: Will call out time/record every 30 sec Everyone repeats observes/records every 30 sec Keep heating until the mothball is boiling or temp is more than 130 C If the temperature (red line on thermometer) gets above PULL IT OUT OF THE TEST TUBE or else you will break it

8 When mothball is completely melted and temp reaches 130 C… Hands/Eyes – Move burner away from the test tube Blow out burner Move ring stand/test tube up Place beaker under test tube Lower test tube into the beaker

9 **Don’t stir with the thermometer  it’ll break Record until temperature stays the same for 2 minutes Keep recording data until mothball is completely frozen. Keep taking temperature

10 Data Table (on graph paper or notebook) 18 rows

11 TEMPERATURECTEMPERATUREC :3022:3033:3044:3055:3066:3077:308 Time All graph – line graph

12 We’ll discuss, Scribe writes - Dependent/Responding Variable: ________ Independent/Manipulated Variable:_______

13 All write Conclusion: What did you observe? Further Questions/what would you change?: Now go fill out the survey on my blog saying you read through the powerpoint


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