The area of a 15-inch pizza is 176.7 in2. Express this area in square centimeters.

A) 1140. cm 2 B) 448.8 cm 2 C) 96.8 cm 2 D) 69.57 cm 2 E) 27.39 cm 2 A) 1140. cm 2 B) 448.8 cm 2 C) 96.8 cm 2 D) 69.57 cm 2 E) 27.39 cm 2 A

As part of an experiment to determine the density of a new plastic developed in her laboratory, Sara Ann Dippity measures the volume of a solid sample. Her four trials yield volumes of 12.37 cm3, 12.41 cm3, 12.39 cm3, and 12.38 cm3. Measurements of other scientists in the lab give an average volume of 12.49 cm3. Which of the following statements represents the best analysis of the data?

A) Sara's results have low precision and high accuracy. B) Sara's results have high precision and high accuracy. C) Sara's results have greater precision than accuracy. D) Sara's results have greater accuracy than precision. E) Sara has been using a faulty instrument to measure the volume. A) Sara's results have low precision and high accuracy. B) Sara's results have high precision and high accuracy. C) Sara's results have greater precision than accuracy. D) Sara's results have greater accuracy than precision. E) Sara has been using a faulty instrument to measure the volume.

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 × 10 16 B) 2.7 × 10 14 C) 2.7 × 10 12 D) 2.7 × 10 8 E) 2.7 × 10 4 A) 2.7 × 10 16 B) 2.7 × 10 14 C) 2.7 × 10 12 D) 2.7 × 10 8 E) 2.7 × 10 4

Exam 1: Keys to the Study of Chemistry: Definitions, Units, and Problem Solving

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

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Which of the following correctly expresses 0.000007913 g in scientific notation?

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The area of a 15-inch pizza is 176.7 in². Express this area in square centimeters.

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

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The SI unit of speed (velocity) is

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Question 5

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

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When a wooden match burns in air, chemical potential energy is converted to kinetic energy.

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The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h?

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Question 8

Isopropyl alcohol, commonly known as rubbing alcohol, boils at 82.4°C. What is the boiling point in kelvins?

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Question 9

As part of an experiment to determine the density of a new plastic developed in her laboratory, Sara Ann Dippity measures the volume of a solid sample. Her four trials yield volumes of 12.37 cm³, 12.41 cm³, 12.39 cm³, and 12.38 cm³. Measurements of other scientists in the lab give an average volume of 12.49 cm³. Which of the following statements represents the best analysis of the data?

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Question 10

The SI prefix mega- (M) means

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Question 11

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.

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Question 12

The number 6.0448, rounded to 3 decimal places, becomes 6.045.

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Question 13

If the price of gold at the morning fixing in London was $5310 per lb, what would a kilogram of gold have cost in £ (pounds)? (Assume an exchange rate of $1.00 = £0.545)

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Question 14

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?

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Question 15

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?

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Question 16

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

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Question 17

The most significant contribution to modern science made by alchemists was

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Question 18

Acetic acid boils at 244.2°F. What is its boiling point in degrees Celsius?

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Question 19

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

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Question 20

Showing 1 - 20 of 71

Exam 1: Keys to the Study of Chemistry: Definitions, Units, and Problem Solving

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

Which of the following correctly expresses 0.000007913 g in scientific notation?

The area of a 15-inch pizza is 176.7 in2. Express this area in square centimeters.

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

The SI unit of speed (velocity) is

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

When a wooden match burns in air, chemical potential energy is converted to kinetic energy.

The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h?

Isopropyl alcohol, commonly known as rubbing alcohol, boils at 82.4°C. What is the boiling point in kelvins?

The SI prefix mega- (M) means

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.

The number 6.0448, rounded to 3 decimal places, becomes 6.045.

If the price of gold at the morning fixing in London was $5310 per lb, what would a kilogram of gold have cost in £ (pounds)? (Assume an exchange rate of $1.00 = £0.545)

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?

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

The most significant contribution to modern science made by alchemists was

Acetic acid boils at 244.2°F. What is its boiling point in degrees Celsius?

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

The Components of Matter

Stoichiometry of Formulas and Equations

Three 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

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 Reaction Direction

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

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The area of a 15-inch pizza is 176.7 in². Express this area in square centimeters.

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?