I want to test how heat effects water. I place a sauce pan on the stove and turn the heat to high on the burner and observe. Which variable is the constant/control variable?

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6

Which substance can be broken down by chemical means

What conclusion can you draw from this experiment about the components of the black ink?