Question

exam 1 chapters 1 - 5 please, turn off your cell phone and use only pencil. write your name on the scantron and exam and show the detail of the numerical problems to get the full credit and turn them in. let me know if you have any questions. exam time is 5:30 to 8:30 pm. true/false. write t if the statement is true and f if the statement is false. 1) observations from experiments are used to test theories. 2) molecules are responsible for bending light which causes the colors of the sunset. 3) the law of conservation of mass states, \in a chemical reaction matter can be created and destroyed.\ multiple choice. choose the one alternative that best completes the statement or answers the question. 4) which of the following statements about soda pop is false? a) the carbon dioxide is forced to mix with the water by the presence of sugars. b) the molecules important to fizzing are carbon dioxide and water. c) when a can is opened, the pressure release allows carbon dioxide to form bubbles. d) soda pop is a chemical mixture of mostly sugar, water and carbon dioxide. e) all of the above statements are true. 5) what is the definition of a scientific theory? a) a method of learning that emphasizes reason as the way to understand the world b) a brief statement that summarizes past observations and predicts future ones c) a model that explains the underlying reasons for observations and laws d) the equivalent of a scientific opinion which others may disagree with e) none of the above 6) which of the following is an example of a scientific theory? a) when a can of soda pop is opened, a fizzing sound is heard. b) flammable objects contain phlogiston. c) all matter is composed of small, indestructible particles called atoms. d) in a chemical reaction, matter is neither created nor destroyed. e) none of the above 7) a good definition of chemistry is: a) the science that seeks to understand the interactions of molecules for the sake of advancing human control over nature. b) the science that seeks to understand what matter does by studying what atoms and molecules do. c) the science that seeks to understand what the universe does by studying interactions of molecules with atoms. d) the science that seeks to understand what living organisms do by studying the molecules that make up the organism. e) none of the above

Explanation:

1. In science, experimental observations are used to test theories, so the first statement is true.
2. The colors of the sunset are due to the scattering of light by molecules in the atmosphere, making the second statement true.
3. The law of conservation of mass states that in a chemical - reaction, matter is neither created nor destroyed, so the third statement is false.
4. Carbon dioxide in soda pop mixes with water due to pressure, not sugar. So statement A is false.
5. A scientific theory is a model that explains the underlying reasons for observations and laws.
6. The atomic theory (all matter is composed of atoms) is a scientific theory.
7. Chemistry is the science that seeks to understand what matter does by studying atoms and molecules.

Answer:

1. T
2. T
3. F
4. A
5. C
6. C
7. B