Answer:
The experimental variable (also know as the intendant variable) is the part of an experiment we change each time we repeat the test.
For example, if you were measuring the time it takes for a substance to react in different acids, the variable we would change would be the type of acid.
The control variable is a part of the experiment which basically gives you a value to compare your other results to.
Using the same example, you may do a test to see how long it takes for the substance to react in water. You could then compare this to the rest of your results for the reactions with the acids.
The example may not be the best, but it gives you the right idea...
Also the dependant variable is...like the name suggests...dependant on the independent variable.
The dependant variable in my example would be the time it takes for the substance to completely react with each acid