Exam 1: Keys to the Study of Chemistry

An evacuated 276 mL glass bulb weighs 129.6375 g.Filled with an unknown gas,the bulb weighs 130.0318 g.Calculate the gas density in g/L,and express it with an appropriate number of significant figures.

(Short Answer)

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Question 41

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

(Multiple Choice)

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Question 42

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

(Multiple Choice)

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Question 43

Which of the following is an extensive property of oxygen?

(Multiple Choice)

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Question 44

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

(True/False)

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Question 45

The appropriate number of significant figures in the result of 15.234 - 15.208 is

(Multiple Choice)

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Question 46

The ripening of fruit,once picked,is an example of physical change.

(True/False)

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Question 47

Write the following numbers and results in standard notation,with appropriate significant figures. a.7.85 $\times$ 10^-3 b.7.85 $\times$ 10⁴ c.5.920 $\times$ 10³ d. $Write the following numbers and results in standard notation,with appropriate significant figures. a.7.85 \times 10-3 b.7.85 \times 104 c.5.920 \times 103 d. e.7.00 \times 10-5 f.circumference of a circle,2 \pi r,where r = 8.7 cm g.$ e.7.00 $\times$ 10^-5 f.circumference of a circle,2 $\pi$ r,where r = 8.7 cm g. $Write the following numbers and results in standard notation,with appropriate significant figures. a.7.85 \times 10-3 b.7.85 \times 104 c.5.920 \times 103 d. e.7.00 \times 10-5 f.circumference of a circle,2 \pi r,where r = 8.7 cm g.$

(Essay)

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Question 48

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

(True/False)

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Question 49

Which of the following is a chemical change?

(Multiple Choice)

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Question 50

The result of (3.8621 $\times$ 1.5630)- 5.98 is properly written as

(Multiple Choice)

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Question 51

In each of the sets below,choose the one quantity or number which is exact. a.(i. )the human population (ii. )the distance in light years from the sun to Alpha Centauri,a nearby star (iii. )the winning time for the 100 m dash in the Olympic Games b.(i. )the weight of a particular one cent coin in g (ii. )the boiling point of lead,in °C (iii. )the number of cm in 1 yd c.(i. )the measured value of the speed of light (2.998... $\times$ 10⁸ m/s) (ii. ) $\pi$ (3.141... ) (iii. )the volume of milk in a 1-gallon jug

(Essay)

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Question 52

Classify the following properties of hydrogen gas as either intensive or extensive. a.the mass of the gas sample b.the average speed of a molecule in the sample c.temperature d.density e.number of molecules present

(Essay)

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Question 53

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

(True/False)

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Question 54

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

(Multiple Choice)

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Question 55

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)

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Question 56

The mass of a sample is 550 milligrams.Which of the following expresses that mass in kilograms?

(Multiple Choice)

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Question 57

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

(True/False)

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Question 58

You prepare 1000.mL of tea and transfer it to a 1.00 quart pitcher for storage.Which of the following statements is true?

(Multiple Choice)

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Question 59

Which of the following represents the largest volume?

(Multiple Choice)

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Question 60

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Exam 1: Keys to the Study of Chemistry

An evacuated 276 mL glass bulb weighs 129.6375 g.Filled with an unknown gas,the bulb weighs 130.0318 g.Calculate the gas density in g/L,and express it with an appropriate number of significant figures.

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

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

Which of the following is an extensive property of oxygen?

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

The appropriate number of significant figures in the result of 15.234 - 15.208 is

The ripening of fruit,once picked,is an example of physical change.

Write the following numbers and results in standard notation,with appropriate significant figures. a.7.85 ×\times× 10-3 b.7.85 ×\times× 104 c.5.920 ×\times× 103 d. e.7.00 ×\times× 10-5 f.circumference of a circle,2 π\piπ r,where r = 8.7 cm g.

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

Which of the following is a chemical change?

The result of (3.8621 ×\times× 1.5630)- 5.98 is properly written as

Classify the following properties of hydrogen gas as either intensive or extensive. a.the mass of the gas sample b.the average speed of a molecule in the sample c.temperature d.density e.number of molecules present

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

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

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?

The mass of a sample is 550 milligrams.Which of the following expresses that mass in kilograms?

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

You prepare 1000.mL of tea and transfer it to a 1.00 quart pitcher for storage.Which of the following statements is true?

Which of the following represents the largest volume?

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

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The result of (3.8621 $\times$ 1.5630)- 5.98 is properly written as

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?