Question
Show the formula, and plug in numbers in equation and solve for the results.
1. A study was conducted to test the effectiveness of
... [Show More] hearing aids. People with different types of hearing loss were included in the study. Which question would help in determining whether the conclusion above is valid?
a. What was the average age of the people in the study?
b. What was the most common occupation of people in the study?
c. How many people were included in the study?
d. How many people in the study had vision problems?
Scientists investigating evaporation rates placed equal amounts of water in 15 identical dishes, which were all stored at the same temperature. Five of the dishes were kept in a low pressure chamber, five were at normal atmospheric pressure, and five were stored in a high-pressure chamber. After 24 hours, the amount of water remaining in each dish was measured.
2. Which of the statements below was most likely the hypothesis for the experiment?
a. "Lower pressure causes increase evaporation because molecules can escape the surface of the liquid more easily."
b. "If lower pressure causes increased evaporation, then the dishes stored in the low-pressure chamber will have the least water remaining after 24 hours."
c. "The five dishes in the high-pressure chamber each lost an average of 14% of their original water content after 24 hours."
d. "All the dishes were stored at equal temperatures."
3. Which question cannot be answered by an experiment?
a. Does penicillin kill salmonella bacteria?
b. Is rabies caused by a virus?
c. Does name-brand dog food make dogs happier?
d. Can radiation cause cancer?
4. The branch of science that studies the properties & composition of matter:
a. Physics
b. Chemistry
c. Natural law
d. History
5. An extensively tested proposal of a scientific principle that explains the behavior of nature.
a. Natural law
b. Theory
c. Scientific method
d. Hypothesis
6. Choose the answer with the correct number of sig figs.
0.305600 x 0.50 =
a. 0.1528 b. 0.153 c. 0.15 d. 0.2
7. Count the number of significant digits in the number 34.29020
a. 4 b. 5 c. 6 d. 7 e. 3
Trial Mass
1 22.1 g
2 28.0 g
3 27.9 g
8. Tom found a gold coin on the sidewalk that has an actual mass of 25.6 g. He took the mass of the coin three times on an electronic scale. According to his data, his measurements were ____________.
a. Precise b. Accurate c. Accurate and precise d. Neither
9. Which number has 3 significant digits?
a. 0.1528 b. 0.153 c. 0.0020 d. 200
10.The diameter of a carbon atom is 0.000000000154 m. What is this number expressed in scientific notation?
a. 1.54 x 1012 m
b. 1.54 x 10-12 m
c. 1.54 x 1010 m
d. 1.54 x 10-10 m
11. How do you write 3.431 x 106 ml in standard notation?
a. 34310ml
b. 3431ml
c. 0.000003431ml
d. 3431000ml
12.Round the answer to the following problem to the proper number of sig figs. 1.7055/ 1.50 =
a. 1.137
b. 1.14
c. 1.41
d. 0.412
13.What is the correct reading for the following graduated cylinder?
a. 23.50 mL b. 23.5 mL c.20.3 mL d. 23.00 mL
14.What is 170000 mg in scientific notation?
a. 1.7 x 105
b. 1.7 x 106
c. 1.7 x 10-5
d. 1.7 x 10-6
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1. A study was conducted to test t [Show Less]