Question

Students are working on an experiment. They have been asked to find out if adding salt to a solution will increase conductivity. One student is having trouble dissolving the salt and suggests that his team boil the water as he adds the salt. Why is this wrong?

1. He is changing more than two variables.
2 Salt will not dissolve in hot water.
3. He is changing more than one variable.
4. The salt will crystallize and break the beaker.

Answer 1

Answer: 3. He is changing more than one

variable.