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?

A) 2.7 × 1016 B) 2.7 × 1014 C) 2.7 × 1012 D) 2.7 × 108 E) 2.7 × 104 A) 2.7 × 1016 B) 2.7 × 1014 C) 2.7 × 1012 D) 2.7 × 108 E) 2.7 × 104

Exam 1: Keys to the Study of Chemistry

Explore all topics

A dictionary has the following definition for a word: "A tentative explanation that accounts for a set of facts." Which of the following words best fits that definition?

Free

(Multiple Choice)

4.8/5

(39)

Question 1

Correct Answer:

Verified

Water vapor is less dense than ice because

Free

(Multiple Choice)

4.8/5

(44)

Question 2

Correct Answer:

Verified

Give an example of a physical property and a chemical property of each of the following: a. oxygen gas b. octane c. copper

Free

(Essay)

4.7/5

(29)

Question 3

Correct Answer:

Verified

Answers could all be the same, but some possibilities are:
a. boiling point, reaction with sodium
b. boiling point, reaction with oxygen
c. electrical conductivity, reaction with nitric acid

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

(Multiple Choice)

4.7/5

(38)

Question 4

The symbol for the SI base unit of mass is

(Multiple Choice)

4.9/5

(41)

Question 5

Briefly explain the relationship between hypothesis and experiment in the scientific method.

(Essay)

4.8/5

(34)

Question 6

Which one of the following numbers contains a digit or digits which is/are not significant?

(Multiple Choice)

4.9/5

(40)

Question 7

Which one of the following is a "substance" in the sense of the word as used in your textbook?

(Multiple Choice)

4.9/5

(39)

Question 8

The SI unit of speed (velocity) is

(Multiple Choice)

4.7/5

(34)

Question 9

The SI prefix mega- (M) means

(Multiple Choice)

4.8/5

(36)

Question 10

Select the best statement.

(Multiple Choice)

4.9/5

(29)

Question 11

Which of the following is an extensive property of oxygen?

(Multiple Choice)

4.9/5

(39)

Question 12

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?

(Multiple Choice)

4.8/5

(38)

Question 13

Use the relationship between temperatures in Celsius and Fahrenheit to calculate the temperature at which a. the numerical value is the same on both scales. b. the Fahrenheit number is exactly twice the Celsius number.

(Essay)

4.8/5

(39)

Question 14

Select the answer that expresses the result of this calculation with the correct number of significant figures.

(Multiple Choice)

4.9/5

(31)

Question 15

The potential energy of a car moving on a level road does not depend on its speed.

(True/False)

4.8/5

(31)

Question 16

When applying the scientific method, it is important to avoid any form of hypothesis.

(True/False)

4.7/5

(30)

Question 17

Talc is a mineral that has low conductivity for heat and electricity and that is not attacked by acid. It is used as talcum powder and face powder. A sample of talc weighs 35.97 g in air and 13.65 g in mineral oil (d = 1.75 g/cm³). What is the density of talc?

(Multiple Choice)

4.9/5

(34)

Question 18

Which of the following abbreviations of the given SI base unit is incorrect?

(Multiple Choice)

4.9/5

(28)

Question 19

The most significant contribution to modern science made by alchemists was

(Multiple Choice)

4.7/5

(28)

Question 20

Showing 1 - 20 of 79

Exam 1: Keys to the Study of Chemistry

A dictionary has the following definition for a word: "A tentative explanation that accounts for a set of facts." Which of the following words best fits that definition?

Water vapor is less dense than ice because

Give an example of a physical property and a chemical property of each of the following: a. oxygen gas b. octane c. copper

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

The symbol for the SI base unit of mass is

Briefly explain the relationship between hypothesis and experiment in the scientific method.

Which one of the following numbers contains a digit or digits which is/are not significant?

Which one of the following is a "substance" in the sense of the word as used in your textbook?

The SI unit of speed (velocity) is

The SI prefix mega- (M) means

Select the best statement.

Which of the following is an extensive property of oxygen?

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?

Use the relationship between temperatures in Celsius and Fahrenheit to calculate the temperature at which a. the numerical value is the same on both scales. b. the Fahrenheit number is exactly twice the Celsius number.

Select the answer that expresses the result of this calculation with the correct number of significant figures.

The potential energy of a car moving on a level road does not depend on its speed.

When applying the scientific method, it is important to avoid any form of hypothesis.

Talc is a mineral that has low conductivity for heat and electricity and that is not attacked by acid. It is used as talcum powder and face powder. A sample of talc weighs 35.97 g in air and 13.65 g in mineral oil (d = 1.75 g/cm3). What is the density of talc?

Which of the following abbreviations of the given SI base unit is incorrect?

The most significant contribution to modern science made by alchemists was

The Components of Matter

Stoichiometry of Formulas and Equations

The Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main Group Elements: Bonding, Structure, and Reactivity

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

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?

Talc is a mineral that has low conductivity for heat and electricity and that is not attacked by acid. It is used as talcum powder and face powder. A sample of talc weighs 35.97 g in air and 13.65 g in mineral oil (d = 1.75 g/cm³). What is the density of talc?