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5/21/2016 Week Four Week Four Due: 11:59pm on Wednesday, June-(Answered)

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Please see the questions in the attachment. Thank you


5/21/2016

 


 

Week Four

 


 

Week Four

 

Due: 11:59pm on Wednesday, June 1, 2016

 

You will receive no credit for items you complete after the assignment is due. Grading Policy

 


 

Exercise 6.8

 


 

Part A

 

What is a state function?

 

ANSWER:

 

Essay answers are limited to about 500 words (3800 characters maximum, including spaces).

 

3785 Character(s) remaining

 

(none provided)

 


 

Part B

 

List some examples of state functions.

 

Check all that apply.

 

ANSWER:

 

pressure

 

internal energy

 

volume

 

work

 


 

Exercise 6.38

 

During an energy exchange, a chemical system absorbs energy from its surroundings.

 


 

Part A

 

What is the sign of ? E sys for this process?

 

ANSWER:

 


 

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Week Four

 


 

? E sys < 0

 

? E sys > 0

 


 

Part B

 

This question will be shown after you complete previous question(s).

 


 

Exercise 6.48

 


 

Part A

 

How much heat is required to warm 1.70 kg of sand from 30.0 ? C to 100.0 ? C ?

 

ANSWER:

 

J

 


 

Exercise 6.64

 

A 32.8 g iron rod, initially at 22.9 ? C , is submerged into an unknown mass of water at 63.6 ? C , in an insulated

 

container. The final temperature of the mixture upon reaching thermal equilibrium is 58.9 ? C .

 


 

Part A

 

What is the mass of the water?

 

Express your answer to two significant figures and include the appropriate units.

 

ANSWER:

 

m

 


 

=

 


 

Exercise 6.80

 


 

Part A

 

Calculate ? H rxn for the following reaction:

 


 


 

CH 4 (g) + 4Cl 2 (g) ? CCl4 (g) + 4HCl(g)

 


 

Use the following reactions and given ?H ? s.

 

C( ) + 2

 

( ) ?

 

( ) ?

 

= ?74.6 kJ

 

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C(s) + 2H 2 (g) ? CH 4 (g)

 

C(s) + 2 Cl 2 (g) ? CCl4 (g)

 

H 2 (g) + Cl 2 (g) ? 2HCl(g)

 


 

?H = ?74.6 kJ

 

?H = ?95.7 kJ

 

?H = ?184.6 kJ

 


 

Express your answer using one decimal place.

 

ANSWER:

 

?H rxn

 


 

=

 


 

kJ

 


 

Exercise 6.58

 

Determine whether each of the following is exothermic or endothermic and indicate the sign of ? H .

 

a. dry ice evaporating

 

b. a sparkler burning

 

c. the reaction that occurs in a chemical cold pack often used to ice athletic injuries

 


 

Part A

 

Determine whether each of the preceding is exothermic or endothermic.

 

Drag the items into the appropriate bins.

 

ANSWER:

 


 

https://session.masteringchemistry.com/myct/assignmentPrintView?assignmentID=4309702

 


 

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Part B

 

Indicate the sign of ? H .

 

Drag the items into the appropriate bins.

 

ANSWER:

 


 

Exercise 6.74

 

Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a

 

thin plastic divider. When the divider is broken, the ammonium nitrate dissolves according to the following endothermic

 

reaction:

 

+

 

?

 

NH 4 NO 3 (s) ? NH (aq) + NO (aq)

 

3

 

4

 

In order to measure the enthalpy change for this reaction, 1.25 g of NH 4 NO 3 is dissolved in enough water to make

 

25.0 mL of solution. The initial temperature is 25.8 ? C and the final temperature (after the solid dissolves) is 21.9 ? C .

 


 

Part A

 

Calculate the change in enthalpy for the reaction in kilojoules per mole. (Use 1.0

 

solution and 4.18 J/g ? ? C as the specific heat capacity.)

 


 

g/mL

 


 

as the density of the

 


 

Express your answer to two significant figures and include the appropriate units.

 

ANSWER:

 


 

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?H rxn

 


 

=

 


 

Exercise 7.8

 


 

Part A

 

What determines the color of a colored object?

 

ANSWER:

 

Essay answers are limited to about 500 words (3800 characters maximum, including spaces).

 

3785 Character(s) remaining

 

(none provided)

 


 

Part B

 

This question will be shown after you complete previous question(s).

 


 

Exercise 7.40

 


 

Part A

 

List the following types of electromagnetic radiation in order of increasing frequency.

 

ANSWER:

 

radio waves, microwaves, visible light, gamma rays

 

radio waves, visible light, microwaves, gamma rays

 

visible light, radio waves, microwaves, gamma rays

 

visible light, radio waves, gamma rays, microwaves

 


 

Part B

 

List the following types of electromagnetic radiation in order of decreasing energy per photon.

 

ANSWER:

 

https://session.masteringchemistry.com/myct/assignmentPrintView?assignmentID=4309702

 


 

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Week Four

 


 

microwaves, visible light, gamma rays, radio waves

 

microwaves, gamma rays, visible light, radio waves

 

gamma rays, visible light, microwaves, radio waves

 

gamma rays, microwaves, visible light, radio waves

 


 

Exercise 7.42

 

Calculate the wavelength of each of the following frequencies of electromagnetic radiation.

 


 

Part A

 

103.2 MHz (typical frequency for FM radio broadcasting)

 

Express your answer using four significant figures.

 

ANSWER:

 

?1

 


 

=

 


 

m

 


 

Part B

 

1075 kHz (typical frequency for AM radio broadcasting) (assume four significant figures)

 

Express your answer using four significant figures.

 

ANSWER:

 

?2

 


 

=

 


 

m

 


 

Part C

 

835.6 MHz (common frequency used for cell phone communication)

 

Express your answer using four significant figures.

 

ANSWER:

 

?3

 


 

=

 


 

m

 


 

Exercise 7.46

 

A heat lamp produces 27.0 watts of power at a wavelength of 6.7 ?m .

 


 

Part A

 

How many photons are emitted per second? (1 watt = 1 J/s )

 

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Week Four

 


 

How many photons are emitted per second? (1 watt = 1 J/s )

 

Express your answer using two significant figures.

 

ANSWER:

 

N

 


 

=

 


 

s?1

 


 

Exercise 7.68

 

Determine whether each of the following transitions in the hydrogen atom corresponds to absorption or emission of

 

energy.

 


 

Part A

 

n = 3 ? n = 1

 


 

ANSWER:

 

absorption of energy

 

emission of energy

 


 

Part B

 

n = 2 ? n = 4

 


 

ANSWER:

 

absorption of energy

 

emission of energy

 


 

Part C

 

n = 4 ? n = 3

 


 

ANSWER:

 

absorption of energy

 

emission of energy

 


 

Exercise 7.70

 


 

Part A

 

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Week Four

 


 

According to the quantum?mechanical model for the hydrogen atom, which of the following transitions would

 

produce light with the longer wavelength: 3p ? 2s or 4p ? 3p?

 

ANSWER:

 

3p ? 2s

 

4p ? 3p

 


 

Exercise 7.43

 

Calculate the energy of a photon of electromagnetic radiation at each of the following wavelengths.

 


 

Part A

 

632.8 nm (wavelength of red light from helium?neon laser)

 

ANSWER:

 

E1

 


 

=

 


 

J

 


 

Part B

 

12.24 cm (wavelength of microwave oven)

 

ANSWER:

 

E2

 


 

=

 


 

J

 


 

Part C

 

337.1 nm (wavelength of nitrogen laser)

 

ANSWER:

 

E3

 


 

=

 


 

J

 


 

Score Summary:

 

Your score on this assignment is 0.0%.

 

You received 0 out of a possible total of 1.7 points.

 


 

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