Discussion

At first, we were at a loss on which experiment we should be doing, and we came up with this idea because it was the one most voted among the three of our research questions (posted at the main page of the blog).

In the end, we realised that how water frooze faster than cold water , when the differences between the two temperatures are not too far apart


 Analysis of results

1) Hot water freezes faster than cold water 
2) Hot water freezes faster than cold water when sugar is added to both
3) Hot water does not freeze faster than cold water when salt is added to both
4) Hot water does not freeze faster than cold water when hydrochloric acid is added to both

1.A) Hot water at 90ºC freezes faster than water at 60ºC 
2.A) Hot water at 90ºC freezes faster than water at 60ºC when sugar is added to both
3.A) Hot water at 90ºC does not freeze faster than water at 60ºC when salt is added to both
4.A) Hot water at 90ºC does not freeze faster than water at 60ºC when hydrochloric acid is added to both

We found out from our experiment that hot water freezes faster than the colder water when the gap between the two is not too wide.

Explanation of key findings
The rate that hot water cools down is faster than cold water, but when the difference between the two is too wide, the cold water will freeze faster than the hotter water.

Evaluation of Hypothesis
Hence, we learnt that hot water freezes faster than the cold water. However, with impurities added, the hot water still freezes faster except for the salt experiment which did not work somehow, but when sugar is added, hot water continues to freeze faster than cold water.


Practical Applications
This can be applied in life situations when you want to make ice for any occasion (Eg: parties), especially when there is not much time left. 

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