1.E: Exercises

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1.1: The Scope of Chemistry

1. Identify each as either matter or not matter.
1. a book
2. hate
3. light
4. a car
5. a fried egg
1. matter
2. not matter
3. not matter
4. matter
5. matter

1. Name an example of a field that is not considered a science.

2. Which of the following fields of study are branches of science?
1. biophysics (a mix of biology and physics)
2. art
1. yes
2. no
3. no

1. Which of the following fields of study are branches of science?
1. accounting
2. geochemistry (a mix of geology and chemistry)
3. astronomy (the study of stars and planets [but not the earth])
1. no
2. yes
3. yes

1. Describe the scientific method.

Simply stated, the scientific method includes three steps: (1) stating a hypothesis, (2) testing the hypothesis, and (3) refining the hypothesis.

1. "A hypothesis is just a guess." Is this an adequate definition?

No, it is not. A hypothesis is a proposed explanation for something that can actually be tested. It is based on data that is available. A guess is not necessarily able to be tested.

1. Why do scientists need to perform experiments?

Scientists perform experiments to test their hypotheses because sometimes the nature of natural universe is not obvious.

1. What is the scientific definition of a theory? How is this word misused in general conversation?

A theory in science is an explanation of some aspect of the natural world that has been substantiated through repeated experiments or testing. In general conversation, a theory is an idea that has not been tested.

1. What is the scientific definition of a law? How does it differ from the everyday definition of a law?