Mixing and Dissolving

Mixing and Dissolving

Aim: To find out how long it will take to make the sugar dissolve.

Method: 

1. 50 mL cold water +1 spatula sugar (Mixed)

2. 50 mL hot water +1 spatula sugar (Stirred)

3. 50 mL hot water +1 spatula sugar (NO Stirring)

4. 50 mL cold water +1 spatula sugar (NO Stirring)

 

Results: 

1

1m

2m

51s

37s

1m

1m 25s

37s

Total: 490s

Average: 490 ÷ 7 = 70s

2

27.5s

14s

25s

20s

1m

15s

31s

21.38s

Total: 213s

Average: 213 ÷ 8 ≈ 27s

3

2m

1m 7s

1m 5s

1m 40s

2m 6s

2m 12s

Total: 590s

Average: 590 ÷ 6 ≈ 98s

4

35s

4m

1m 32s

1m 41s

2m 34s

Total: 622s

Average: 622 ÷ 5 = 124.4s

How did this happen?

Because hot water spread the particles around 

Questions: 

What are the ideas from today?

I learnt that if you want to dissolve something in a cup of water, there is a way that can dissolve faster, you put hot water in the cup and stir it around it will dissolve faster if you use cold water.

What factors affect dissolving?

If you don't Stir it, the sugar will dissolve slower than is you stir it, and if you use hot water it will dissolve faster than cold water.

Discussion:

The experiment shows that hot water + stir is the best to dissolve something fast in these 4 groups.

And the experiment shows that cold water + no stir is the slowest dissolving in these 4 groups.

holiday

Hi guys. In the holidays I didn't go anywhere too far, I stayed at home and played some games, watch some youtube, went shopping. I played a lot of badminton, I train myself by hit against the wall practice the moves by myself, I play at school every Tuesday 7:30 - 8:40 with my friends and the year 10 - 12.

I have training on Monday (today), playing a game on Wednesday.