Introduction:

Can We Write Your Essay?

Ace your next assignment with help from a professional writer. Free proofreading and copy-editing included.

The rate at which an object cools (i.e. how quickly its temperature decreases) depends upon several factors, including:

  • Surface area
  • Volume
  • Type of insulation
  • Temperature difference with the surroundings

For this investigation, the effect of the temperature of water upon the rate of cooling will be investigated. The temperature-drop over 5 minutes (600 seconds) will be measured for 200ml of water at different start temperatures. The average rate of cooling can then be found by:

avg-rate-of-cooling

Apparatus:cooling

  • digital stopwatch
  • 250ml beaker
  • rubber bung
  • thermometer
  • bunsen burner
  • tripod
  • gauze
  • retort stand and clamp
  • goggles

Control Variables:

  • Volume of water used: 150ml
  • Size of beaker (i.e. constant surface area): 250ml
  • Time interval of cooling: 5.0 minutes (600 seconds)
  • Temperature of the room: 21°C

Method:

  • Fill an empty beaker with exactly 150ml of water (check side-scale of beaker)
  • Set up apparatus as shown above. Ensure the thermometer is about 2cm above the bottom of the beaker.
  • Light the bunsen burner and put on a blue flame. Heat up the water.
  • When the temperature on the thermometer has reached 90°C, immediately switch off the burner.
  • Start the stopwatch and time for 5.0 minutes.
  • Read the thermometer value at the 5.0 minute mark.
  • Before repeating the experiment, check the level of water is still 150ml (some may have evaporated) and add more water if required.
  • For different start temperatures, repeat steps 3-7 but turn off the burner at the desired temperature.
READ:
Beer's Law Lab Explained: Absorbance vs. Concentration

Results:

Start Temperature of Water (°C)Temperature after 5min (°C)Drop in Temperature

(°C)

Average Rate of Cooling x 1000 (°C/s)
80701017
7566915
7062813
6559610
605558

 

cooling-rate-graph

Conclusion:

There is a strong correlation between the average rate of cooling and the start temperature: the greater the start temperature, the faster the average rate of cooling.

Can We Help with Your Assignment?

Let us do your homework! Expert writers in all subject areas are available and will meet your assignment deadline.

guest
31 Comments
Newest
Oldest Most Voted
Inline Feedbacks
View all comments
Ash
Ash
5 months ago

Thank you this has been very helpful

Holo
Holo
5 months ago

Why does it cool the most in the first five mins

fawziya A.
fawziya A.
1 year ago

very good

Pri
Pri
2 years ago

You have made an error with the time. 5 min is 300s, not 600.

student
student
3 years ago

5 mins is not 600 seconds

Angie
Angie
3 years ago

How 5 minutes can be 600 sec ? I think it is 300 sec therefore the average rate of cooling is wrong.

Henry P.
Henry P.
3 years ago

Perfect, thanks

brian
brian
3 years ago

WOWWW!! best link ever.

guest
guest
3 years ago

risk assessment?

Georgia
Georgia
3 years ago

This is the best link EVER!!!!!!!!!

guest
guest
3 years ago

this was a real nice bit of work gotta love it

guest
guest
3 years ago

lovely stuff

jack
jack
3 years ago

helpful ._.

Alisha M.
Alisha M.
Reply to  jack
3 years ago

this is very helpful thanks!

Guest
Guest
3 years ago

hi, nice work! Useful for the CAU

callum E
callum E
3 years ago

amazing wow its so good I cant believe it

S.Henry
S.Henry
3 years ago

thanks

Nikesh C.
Nikesh C.
3 years ago

thanks! this was very helpful.

Stella
Stella
Reply to  Nikesh C.
10 months ago

I know it was very helpful

M. Gurung
M. Gurung
3 years ago

This was very helpful.

Alex
Alex
3 years ago

i need another source like this to compare, but i can’t find any. help with link?

Nigel M.
Nigel M.
4 years ago

Wow this has helped me so great thank !