1) When carbon and oxygen combine chemically, what is true about the mass of the product? a) Greater than the mass of the carbon plus the mass of the oxygen b) Equal to the mass of the carbon plus the mass of the oxygen c) Equal to the mass of the carbon d) Less than the mass of the carbon 2) In order to help visualize an atom, a scientist may do which of the following? a) Form a hypothesis b) Make a model. c) Create a law d) Develop a theory 3) The table below shows the results of testing four body fluids for pH and each fluids reaction to litmus paper. What do these data indicate about gastric juice? a) It is very acidic b) It is very basic c) It is neutral d) It is dark red 4) A student was assigned to take water samples from a lake near his home. He measured the pH of one of the water samples to be 6.0. Which of the following best describes this sample of water? a) Highly acidic b) Highly basic c) Slightly acidic d) Slightly basic 5) When combined in the correct ratio, hydrogen and oxygen atoms can form water as show below. In this example, water is an example of which of the following? a) Molecules of an element b) Molecules of a compound c) Atoms of a compound d) A mixture

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