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

A) 2.7 $\times$ 1016 B) 2.7 $\times$ 1014 C) 2.7 $\times$ 1012 D) 2.7 $\times$ 108 E) 2.7 $\times$ 104 A) 2.7 $\times$ 1016 B) 2.7 $\times$ 1014 C) 2.7 $\times$ 1012 D) 2.7 $\times$ 108 E) 2.7 $\times$ 104

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.

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. )

A) 1.992 g/cm3 B) 1.840 g/cm3 C) 1.729 g/cm3 D) 1.598 g/cm3 E) 0.543 g/cm3 A) 1.992 g/cm3 B) 1.840 g/cm3 C) 1.729 g/cm3 D) 1.598 g/cm3 E) 0.543 g/cm3

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?

A) 849 lb/in3 B) 491 lb/in3 C) 376 lb/in3 D) 0.491 lb/in3 E) 1.83 $\times$ 10-3 lb/in3 A) 849 lb/in3 B) 491 lb/in3 C) 376 lb/in3 D) 0.491 lb/in3 E) 1.83 $\times$ 10-3 lb/in3

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

A) 1140.cm2 B) 448.8 cm2 C) 96.8 cm2 D) 69.57 cm2 E) 27.39 cm2 A) 1140.cm2 B) 448.8 cm2 C) 96.8 cm2 D) 69.57 cm2 E) 27.39 cm2

Exam 1: Keys to the Study of Chemistry

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

(Multiple Choice)

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Question 21

The S.I.prefix mega- (M)means

(Multiple Choice)

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Question 22

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?

(Multiple Choice)

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Question 23

Write the following numbers and results in scientific notation,with appropriate significant figures. a.654 b.1234560 c.0.000000673 d.0.002590 e.200.4 f.260.0 g. $\pi$ r ²,where r = 8.7 cm h.23.24 + 18.6 - 5

(Essay)

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Question 24

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. )

(Multiple Choice)

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Question 25

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?

(Multiple Choice)

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Question 26

A dose of medication was prescribed to be 35 microliters.Which of the following expresses that volume in centiliters?

(Multiple Choice)

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Question 27

Which of the following is not an S.I.base unit?

(Multiple Choice)

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Question 28

An important aim in much chemical work is to use macroscopic measurements in order to gain an understanding of the microscopic world.

(True/False)

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Question 29

When applying the scientific method,a model or theory should be based on experimental data.

(True/False)

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Question 30

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?

(Multiple Choice)

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Question 31

Acetone,which is used as a solvent and as a reactant in the manufacture of Plexiglas®,boils at 56.1°C.What is the boiling point in degrees Fahrenheit?

(Multiple Choice)

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Question 32

Select the best statement.

(Multiple Choice)

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Question 33

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

(Multiple Choice)

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Question 34

The average distance from Earth to the Sun is 150 megameters.What is that distance in meters?

(Multiple Choice)

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Question 35

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

(Multiple Choice)

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Question 36

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

(Multiple Choice)

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Question 37

The appropriate number of significant figures in the result of 15.234 $\times$ 15.208 is

(Multiple Choice)

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Question 38

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)

(Multiple Choice)

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Question 39

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

(Multiple Choice)

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Question 40

Showing 21 - 40 of 66

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

The S.I.prefix mega- (M)means

Write the following numbers and results in scientific notation,with appropriate significant figures. a.654 b.1234560 c.0.000000673 d.0.002590 e.200.4 f.260.0 g. $\pi$ r ²,where r = 8.7 cm h.23.24 + 18.6 - 5

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?

A dose of medication was prescribed to be 35 microliters.Which of the following expresses that volume in centiliters?

Which of the following is not an S.I.base unit?

An important aim in much chemical work is to use macroscopic measurements in order to gain an understanding of the microscopic world.

When applying the scientific method,a model or theory should be based on experimental data.

Acetone,which is used as a solvent and as a reactant in the manufacture of Plexiglas®,boils at 56.1°C.What is the boiling point in degrees Fahrenheit?

Select the best statement.

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

The average distance from Earth to the Sun is 150 megameters.What is that distance in meters?

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

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

The appropriate number of significant figures in the result of 15.234 $\times$ 15.208 is

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)

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

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 Solutions

The Main-Group Elements: Applying Principles of Bonding and Structure

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 Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Exam 1: Keys to the Study of Chemistry

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

The S.I.prefix mega- (M)means

Write the following numbers and results in scientific notation,with appropriate significant figures. a.654 b.1234560 c.0.000000673 d.0.002590 e.200.4 f.260.0 g. π\piπ r 2,where r = 8.7 cm h.23.24 + 18.6 - 5

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?

A dose of medication was prescribed to be 35 microliters.Which of the following expresses that volume in centiliters?

Which of the following is not an S.I.base unit?

An important aim in much chemical work is to use macroscopic measurements in order to gain an understanding of the microscopic world.

When applying the scientific method,a model or theory should be based on experimental data.

Acetone,which is used as a solvent and as a reactant in the manufacture of Plexiglas®,boils at 56.1°C.What is the boiling point in degrees Fahrenheit?

Select the best statement.

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

The average distance from Earth to the Sun is 150 megameters.What is that distance in meters?

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

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

The appropriate number of significant figures in the result of 15.234 ×\times× 15.208 is

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)

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

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 Solutions

The Main-Group Elements: Applying Principles of Bonding and Structure

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 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 $\times$ 10¹⁰ molecules in one cubic centimeter of a gas.How many molecules is this per cubic meter?

Write the following numbers and results in scientific notation,with appropriate significant figures. a.654 b.1234560 c.0.000000673 d.0.002590 e.200.4 f.260.0 g. $\pi$ r ²,where r = 8.7 cm h.23.24 + 18.6 - 5

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

The appropriate number of significant figures in the result of 15.234 $\times$ 15.208 is

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