Q: Which of the following is the correct setup to convert 2.44 meters to centimeters?

$$2.44\ \mathrm{m} \times \frac{100\ \mathrm{cm}}{1\ \mathrm{m}}$$

Question 1

Which of the following best describes the difference between science and technology?

Accepted Answer

Science is the process of seeking an understanding of nature, while technology is the direct application of that knowledge to solve problems.

Question 2

Which of the following is an example of a chemical change?

Accepted Answer

A bicycle left outdoors begins to rust.

Question 3

A hypothesis in science must be:

Accepted Answer

Testable

Question 4

Which of the following statements is a scientific law?

Accepted Answer

The total mass of substances present at the end of a chemical process is the same as the mass of substances present before the process took place.

Question 5

Which of the following is NOT a pure substance?

Accepted Answer

Air

Question 6

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture that is uniform in composition throughout.

Question 7

Which of the following is the correct formula for density?

Accepted Answer

$$d = \frac{m}{V}$$

Question 8

A 10.0-g sample of which of the following substances would have the greatest volume? (Assume densities: gold = 19.3 g/mL, aluminum = 2.70 g/mL, water = 1.00 g/mL, ethanol = 0.789 g/mL)

Accepted Answer

Ethanol

Question 9

Which state of matter is composed of particles that are free to move about, but remain close together?

Accepted Answer

Liquid

Question 10

When one travels from Earth to the moon, one’s mass ______ and one’s weight ______.

Accepted Answer

remains the same / decreases

Question 11

Convert 1.83 kg to grams.

Accepted Answer

1830 g

Question 12

A sample of iron has a mass of 156 g and a volume of 20.0 mL. What is its density?

Accepted Answer

$$7.80\ \mathrm{g/mL}$$

Question 13

Which of the following is a chemical property?

Accepted Answer

Reactivity with acid

Question 14

Which of the following is the correct equation to convert Celsius to Kelvin?

Accepted Answer

$$T_K = T_C + 273.15$$

Question 15

A person with hypothermia has a body temperature of $$34.8\ ^\circ\mathrm{C}. $$What is that temperature in $$^\circ\mathrm{F}$$? Use $$T_F = 1.8T_C + 32.$$

Accepted Answer

$$94.6\ ^\circ\mathrm{F}$$

Question 16

Which of the following is an example of applied research?

Accepted Answer

Developing over 300 products from peanuts to solve agricultural problems.

Question 17

Which of the following is the best example of a risk–benefit analysis in chemistry?

Accepted Answer

Evaluating whether the short-term use of ketorolac is appropriate for a young, healthy patient after surgery.

Question 18

Which of the following is a limitation of science?

Accepted Answer

Science is limited to studying observable phenomena and processes where variables can be controlled.

Question 19

Which of the following is the correct setup to convert 2.44 meters to centimeters?

Accepted Answer

$$2.44\ \mathrm{m} 	imes \frac{100\ \mathrm{cm}}{1\ \mathrm{m}}$$

Question 20

Which of the following best describes the main goal of green chemistry?

Accepted Answer

To use materials and processes that prevent or reduce pollution at its source.

Introduction to Chemistry: Foundations, Methods, and Measurement

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