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# Kanchana lab report

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### Kanchana lab report

1. 1. Name: Kanchana Jaishankar  GROUP: Yuan Yuan, Sally Title:  Factors that aﬀect the cooling rate of water A.  Aim (What do you want to ﬁnd out?) How the amount of water could aﬀect the rate of cooling water. B.  Hypothesis (What do you think will happen?) If i boil 100 ml of water, then it’s cooling rate will be faster then the cooling rater of 30o ml and 500 ml. I  think that 500 ml will have a slower cooling rate then 300 ml.     What is the scienNﬁc reason for your hypothesis?              1) Due to diﬀusion. It will take longer to diﬀuse amongst  bigger amounts. C. Variables i. Input variable                             Amount of water, Surface area of the opening of  container, starEng temperature of                                water.     How will you change it?                                                            I will change it by either dropping or increasing the amount of water in the container. ii. Output variable:  Time to cool, Temperature of water How will you measure it?  I will measure it by using a stopwatch ( to keep track of Eme), A thermometer (to know  then the water reaches room temperature). iii. Control variable 1: What is it? How will I keep it the same? IniEal Room Temperature.  I will keep it constant by measuring and recording the  temperature before I start heaEng the water.   iv. Control variable 2: What is it? How will I keep it the same? Surface area of water. I will keep it constant by not changing the type of beaker.
2. 2. v. Control variable 3: What is it? How will I keep it the same?                              Materials of beaker. I will keep it constant by using the same type of beaker.  D.  Materials 1. 3x 500 ml Beaker 2. 3 Bunsen Burner 3. 3 Heat Proof Mat 4. 3 Gauze Mat 5. 2 x Thermometer 6. 3 x Tripod 7. 3 x Retort STand 8. 3 x Clamp 9. 3 x Boss head 10. 1 x Measuring Cylinder 11. 1 x Ignitor E.  Method 1.  Wear your Safety Equipment 2.  Ignite the Bunsen Burner 3.  Start Boiling the water 4.  Boil unEl it reaches 60 ˚C 5. Stop Burner 6. Wait For water to cool 7. Record date Per Minute
3. 3.     F.  Data Table Minutes 500 ml 300ml 100ml 1 59 60 58 2 58.5 59 56 3 58 57 54 4 57 56 52 5 56.5 55.5 50 6 55.5 55 48 7 55 54 46 8 54 52.5 45 9 54 52 44 10 54 51 42  G.  Graph Blue ‐ 300ml RED‐ 500 ml   Yellow‐ 100 ml
4. 4.                                      GRAPH  60 T 40 e m p r a 30 t u r e 20 10           1               2               3                4                    5                      6                    7               8           9             10 Minute
5. 5. H.  Conclusion i.  Was your hypothesis correct?                Yes, My hypothesis was correct. According to my data, the 100 ml  dropped lower than  300 or 500 ml and 500 indeed did take the maximum amount of Eme to cool down.  I think that  my hypothesis was preYy easy to guess and so is my most accurate hypothesis Ell date. ii.  Why or why not?  ScienNﬁc Reason? My hypothesis was correct because of my scienEﬁc reason.  Because of Diﬀusion. The  more amount of water, The more Eme it takes to heat. And even more Eme to cool. It  will actually be a while Ell it cools down and reaches iniEal room temperature.     Iv.  Do you trust your data? Why?              I don’t trust my data completely. Because I was constantly distracted, I someEmes mearured the  Eme ﬁve to ten seconds a[er the minute passed. I.  EvaluaNon i.  Name two errors in your experiment:   a) When we ﬁrst did our experiment, We graphed out data wrong.  And so, we had  to change quanEEes and Eme limits so that we can complete our work on Eme. We  had to alter the quanEty of water and the boiling point to 60˚C.
6. 6. b) We actually ended up conducEng the experiment two Emes. The second Eme we  conducted the experiment, We  ended up creaEng many improvisaEons. This may  have aﬀected out results. ii. Name two improvements you could make: a) At either some point of Eme, We either didn’t co‐operate with each other or had  the idea communicated throughout the group wrong.  And so I think that the  experiment may have been a much more successful if the team would have co‐ operated a bit more. b)  I also think that we could have improved by paying more aYenEon during the  experiment. I always  got carried away and distracted by my friends or my  homework from other classes.. If I was exact in my recordings, Then I would have  probably ended up with a beYer and more accurate result. iii  Other invesNgaNons you could do could do which are similar: A) The amount of Nme it takes to melt ice. B)