The Can Experiment

 Hi everyone! Welcome to another post, today in science we did an experiment that relates to expansion and contraction. But before we did the experiment we first had to answer some questions.

a) What are expansion and contraction? why do they happen? 

Expansion is something that grows in size, while the contraction is when something has reduced in size. It happens when materials are subjected to heat or any other temperature.

b) Why did the can crinkle up?

When the hot water in the can was exposed to the ice-cold water the hot can's energy slowly disappears from the hot can. 

c) Were the water particles in the can speeding up or slowing doesn't as it was heated?

The water particles in the can were speeding up because the can was heating up, and because it was heating up it caused the particles or speed up. (Diffusion)

d) When the can got placed in the cold water, what happened to the particles inside the can? Why did it happen?

The water particles got slowed down and they then closely pack together.

e) If the can was put in cold water with the top opening pointing up, do you think the experiment would have still worked the same? why/why not?

I think that it would still work because we're still using hot and cold water, its just that the roles have reversed. 

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.