Mixing and Dissolving - Hurumanu 3

 Hi everyone! Welcome to another post! Today we have started new sub-topic for Hurumanu 3, science. That sub-topic is Mixing and separating, but today we learned about mixing and dissolving substances. We also did an experiment today where we looked at how sugar dissolved in different temperatures. 

But before that, we learned about what mixing, dissolving, soluble and insoluble is. 

• Mixing/Mixture: A substance made by two or more substances that are mixed together. 
  Examples of a Mixture: - They are all made up of different substances. 
  -  Coke
  -  Sand 
  -  Cake 
  -  Salad 

• Dissolving: Dissolving is when a substance becomes part of a liquid. 
  -  You can speed up dissolving when you stir or change the temperature. 

• Soluble: It means something that can be dissolved in water.

• Insoluble: It means something that can't be dissolved in water. 

In our experiment, we investigated how fast sugar can dissolve in different temperatures and how it can dissolve whether we mix it or not. We had to conduct 4 experiments where we changed the temperature of the water and whether we decide to mix it or not. 

Hypothesis: I think that the sugar in the hot water + mixed would be the fastest at dissolving. 

Aim: Rate of dissolving depending on temperature and stirring. 

Method: First of all you need to gather the tools needed. We used 2 beakers on small and one medium-sized. We then put some sugar into the small beaker and put some water in it. We did 4 times and each time we did that we changed the water temperature by rinsing it and pouring new water in. After doing that we then used a spatula and scooped a small of sugar to put inside the beaker. Lastly, we timed it and looked at how much time it took to dissolve

Results:

1. 50ml cold water + 1 Spatula Sugar = mixed/stirred

2. 50ml hot water + 1 Spatula Sugar = mixed/stirred

3. 50ml hot water + 1 Spatula Sugar = un-mixed/not stirred

4. 50ml cold water + 1 Spatula Sugar = un-mixed/not stirred

Along with investigating the result we also had to time how much time it took for the sugar to dissolve in the water. For the results, we added all our timed times together for our total and then we divided that number with how many recorded times were on the board to make of average time. 

1. cold water + sugar / stirred  =  Total: 490 secs - Average: 70 secs

2. hot water + sugar / stirred = Total: 213 secs - Average: 27 secs

3. ho water + sugar / not stirred = Total: 590 secs - Average: 78 secs

4. cold water + sugar / not stirred = Total: 622 secs - Average: 124.4 secs 

Conclusion:

In conclusion, the hot water + stirred with the sugar is the fastest to dissolve. This happens because there is more energy in hot water and when we mix it we make more energy making the sugar dissolve faster.