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Chapter 1: Q. 1.32 (page 22)
A "chemical-free" sunscreen includes the following ingredients: titanium dioxide, vitamin, and vitamin. Is the sunscreen truly "chemical-free"?
The sunscreen is not truly "chemical-free".
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Obtain a box of breakfast cereal and read the list of ingredients. What are four chemicals from the list?
Select the correct phrase(s) to complete the following statement: A hypothesis is confirmed when: (1.2)
a. one experiment proves the hypothesis
b. many experiments validate the hypothesis
c. you think your hypothesis is correct
Classify each of the following statements as an observation or a hypothesis:
a. Analysis ofceramic dishes showed that four dishes contained lead levels that exceeded federal safety standards.
b. Marble statues undergo corrosion in acid rain.
c. A child with a high fever and a rash may have chickenpox.
What is the place value for the bold digit?
a.
b.
c.role="math" localid="1651733426370"
A student in your class asks you for advice on learning chemistry. Which of the following might you suggest?
a. studying different topics at the same time
b. not reading the text; it's never on the test
c. attending review sessions
d. working on the problems again after a few days
e. keeping a problem notebook.
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