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. a hypothesis b. a theory c. a datum d. a law
2. A hypothesis is
a. obeyed under any circumstances.
b. a theory that has been proved
c. a tentative explanation for a natural phenomenon
d. a description of a pattern or relationship in experimental data
3. A number of people become ill after eating dinner in a restaurant. Which of the following statements is a hypothesis?
a. The cooks felt really bad about it.
b. Everyone who ate oysters got sick.
c. Bacteria in the oysters may have caused the illness.
d. Symptoms include nausea and dizziness
e. People got sick whether the oysters were raw or cooked.
4.A natural law is
a. a description of a pattern or relationship in experimental data
b. an explanation that has been proved
c. a tentative explanation for a natural phenomenon
d. obeyed under any circumstances.
5. Which of the following is least important to know about a liquid solution you are using during a laboratory investigation?
a. price of the solution per mL
b. flammability of the solution
c. first aid procedures to follow for skin contact
d. recommended procedures for appropriate Disposal
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