An electric current is passed through water and bubbles start forming. what is a logical conclusion for the bubbles? a) water is evaporating. b) the water had impurities in it. c) a physical changes has occurred. d) hydrogen and oxygen are being formed.

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount

An observation that requires measurement is called quantitative observable or qualitative

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false