# Homework Help: Independent variable question i'm not getting

1. Oct 11, 2016

### victorhugo

• In the future please post this type of questions in the homework section, using the template.

I know that D is definitely a dependent variable, but I don't see how the others are dependent on anything else... The correct answer is A btw.
Please explain to me how B and C are dependent variables considering the investigation is to "determine and compare the heat of combustion of three different liquid alkanols."

2. Oct 11, 2016

### Staff: Mentor

A is the independent variable you want to study. B and C are free parameters in your experiment but they do not (or should not) influence the result.

3. Oct 11, 2016

### Zypheros_Knight

Both B and C point to the same direction but we want to find the heat energy in Kj/mol of the alkanols....changing the amount of water to be heated would mean we would need change the amount of of the fuel this shows that the two variables are dependent on each other.If you want further clarification just ask.