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Exam 1: Keys to the Study of Chemistry

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Question 21

Multiple Choice

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Which of the following is a chemical change?

A) boiling of water
B) melting wax
C) broiling a steak on a grill
D) condensing water vapor into rainfall
E) carving a piece of wood

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Question 22

Multiple Choice

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The distance between carbon atoms in ethylene is 134 picometers. Which of the following expresses that distance in meters?

A) 1.34 *10^-13 m
B) 1.34 * 10^-12 m
C) 1.34 * 10^-10 m
D) 1.34 * 10^-7 m
E) 1.34* 10^-6 m

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Question 23

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A scientist made careful measurements of the pressure and temperature of many different gases. Based on these measurements, he concluded that "the pressure of a fixed amount of gas, measured at constant volume, is directly proportional to its absolute temperature." This statement is best described as a

At a pressure of one billionth (10^-9) of atmospheric pressure, there are about 2.7 * 10¹⁰ molecules in one cubic centimeter of a gas. How many molecules is this per cubic meter?

Give an example of a physical property and a chemical property of each of the following: A) oxygen gas B) octane C) copper

The density of mercury, the only metal to exist as a liquid at room temperature, is 13.6 g/cm³. What is that density in pounds per cubic inch?

The weight of a coin measured as 1.96235 g on one balance is definitely more accurate than a weight measurement of 1.95 g on another balance.

Express 96,342 m using 2 significant figures.

The numerical value of any temperature expressed in Celsius is always different from the numerical value of the same temperature in Fahrenheit.

Which measurement is expressed to 4 significant figures?

A large pizza has a diameter of 15 inches. Express this diameter in centimeters.

A student makes several measurements of the density of an unknown mineral sample. She then reports the average value of these measurements. The number of significant figures she uses in her result should be a measure of its

Which of the following correctly shows how to convert a density of 20.1 g cm^-3 to units of kg m^-3?

The S.I. unit of speed (velocity) is

The number 6.0448, rounded to 2 decimal places, becomes 6.05.

A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H₂SO₄, its mass is 1026.57 g. What is the density of concentrated sulfuric acid? (Assume water has a density of 1.00 g/cm³ at the temperature of the measurement.)

- 5.98 is properly written as:

Which of the following correctly expresses 52,030.2 m in scientific notation?

In an average year the American chemical industry produces more than 9.5 million metric tons of sodium carbonate. Over half of this is used in the manufacture of glass while another third is used in the production of detergents and other chemicals. How many pounds of sodium carbonate are produced annually?

If the density of a certain spherical atomic nucleus is 1.0 * 10¹⁴ g cm^-3 and its mass is 2.0 * 10^-23 g, what is its radius in cm?