Answer:
Red, orange, yellow, green, blue, indigo, and violet.
Explanation:
These are the colors that light takes on when split using a prism. These are the same colors that are in a rainbow. You can remeber these colors using this acronym:
R.O.Y G. B.I.V
It's kinda like a name!
The answer is column>soda straw>stalactite
To solve number 18 you have to add the positive and negative to equal zero. For example for 18a it would be K2S ( the 2 is a subscript ) because you need 2 positives to cancel out the 2 negatives.
Control is something that remains the same or constant through an experiment. And an experiment group is the group you test the one change on. (Also called the dependent variable)