General Chemistry Online: Companion Notes: Introduction: Quiz: Scientific method

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Scientific method

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Companion Notes

Introduction

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1. The statement, "A chemical reaction never creates products that weigh more or less than the reactants", is based on three centuries of experimental observation. The statement is an example of:

a hypothesis

a datum

a law

a theory

2. Which of the following statements is a law?

	An egg takes less time to cook in Baltimore than in Denver.
	Higher altitude means lower boiling points for water, all other things held equal.
	An egg cooked for 27 minutes in Baltimore was badly overcooked.
	An egg cooks in 17 minutes at sea level.

3. A number of people become ill after eating dinner in a restaurant. Which of the following statements is a hypothesis?

	Symptoms include nausea and dizziness
	Everyone who ate oysters got sick.
	Bacteria in the oysters may have caused the illness.
	The cooks felt really bad about it.
	People got sick whether the oysters were raw or cooked.

4. A hypothesis is

	a description of a pattern or relationship in experimental data
	a theory that has been proved
	a tentative explanation for a natural phenomenon
	obeyed under any circumstances.

General Chemistry Online! Quiz: Scientific method