1. EXPERIMENTS IN DAILY LIFE
Scientific Method

2. Lots of people like sugar in their coffee. But have you ever wondered…?
• How much sugar will dissolve in a cup of coffee?
• Is it easier to dissolve sugar in cold or hot liquid?
• Is it easier to dissolve sugar in coffee? in water? in oil?

3. First we need three scientific hypotheses:
Use the expressions:
It depends on… It is independent of…
If … (I do this) …, then… (this)… will happen
For the first question:
The amount of sugar dissolved depends on the quantity of solvent. I think that when the amount of the coffee is higher, more sugar is dissolved.

4. Now we need to design our experiments:
There are three important questions:
What is constant in the experiment? What are the independent variables? What is the dependent variable?
Remember: depending on the hypothesis that you are checking the variables will change.

5. Now we need to conduct our experiments:
Materials:
Sugar
Four beakers
Graduated cylinders
Coffee
A spatula
A scale

6. We also need to write a procedure
For the first hypothesis:
Measure different amounts of liquid using graduated cylinders and put them into four beakers.
(For example: 25 ml, 50 ml, 75 ml and 100 ml). Amount of liquid  Independent variable
Add sugar until it begins to form a deposit on the bottom, even after stirring (one by one)
(We have to measure the amount of sugar added using an scale. Amount of sugar added  Dependent variable)
What are the control variables in this experiment?

7. Analysis of results
Draw the graph (remember independent variable is represented on x axis)
We observe that when the amount of the coffee is higher, more sugar is dissolved. Thus, the hypothesis is true.
Volume coffee (ml) 25 50 75
100
Mass sugar added (g)