Q: How many minutes are in 1.4 days?

$$2.0 \times 10^3$\ \mathrm{min}$$

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

Accepted Answer

Liquid

Question 7

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 8

Which of the following is the correct formula for density?

Accepted Answer

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

Question 9

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

Accepted Answer

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

Question 10

Which of the following is a correct conversion factor for changing centimeters to inches?

Accepted Answer

$$1\ \mathrm{in.} = 2.54\ \mathrm{cm}$$

Question 11

How many minutes are in 1.4 days?

Accepted Answer

$$2.0 	imes 10^3$\ \mathrm{min}$$

Question 12

Which of the following is an example of applied research?

Accepted Answer

Developing over 300 products from peanuts to solve agricultural problems.

Question 13

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture with uniform composition throughout.

Question 14

Convert 1.83 kg to grams.

Accepted Answer

$$1830\ \mathrm{g}$$

Question 15

Which of the following is a chemical property?

Accepted Answer

Reactivity with acid

Question 16

A 747 is fueled with 173,231 L of jet fuel. If the density of the fuel is $$0.768\ \mathrm{g/cm^3$}$$, what is the mass of the fuel in kilograms? (1 L = 1000 cm³, 1000 g = 1 kg)

Accepted Answer

$$133,000\ \mathrm{kg}$$

Question 17

Which temperature is the boiling point of water on the Kelvin scale?

Accepted Answer

$$373\ \mathrm{K}$$

Question 18

Which of the following is the correct formula to convert Celsius to Fahrenheit?

Accepted Answer

$$T_F = 1.8 T_C + 32$$

Question 19

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

Accepted Answer

To prevent or reduce pollution at its source.

Introduction to Chemistry: Foundations, Methods, and Measurement

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