Zumdahl - Intro Chemistry: A Foundation 5/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 32 / 34

Due : Thursday, April 9, 2020 08:00 EDT

Last Saved : n/a Saving... ()

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Points

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Total

32/34 (94.1%)

Instructions

Here are some textbook questions from Introductory Chemistry: A Foundation 5/e by Zumdahl and Zumdahl published by Brooks/Cole. Click here for a list of all of the questions coded in WebAssign. This demo assignment allows many submissions and allows you to try another version of the same question for practice.

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1. –/1 points ZumIntro5 2.P.036. My Notes

Why can the length of the pin shown in Figure 2.5 not be recorded as 2.850 cm? (Select all that apply.)

Figure 2.5

Writing 2.850 implies that the scale was marked to the nearest thousandth of the cm. correct

The scale of the ruler is only marked to the nearest tenth of the cm. correct

Writing 2.850 implies that the scale was marked to the nearest hundredth of the cm. Writing 2.850 implies that the zero in the hundredths place had been estimated.

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2. –/2 points ZumIntro5 4.034. My Notes

Are all atoms of the same element identical?

yes

Comment how can they differ or if they are identical.

(No Response)

Key: Atoms of the same element (i.e., atoms with the same number of protons in the nucleus) may have different numbers of neutrons, and so will have different masses.

This answer has not been graded yet.

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3. –/6 points ZumIntro5 7.016. My Notes

On the basis of the general solubility rules given in Table 7.1, predict the identity of the precipitate that forms when aqueous solutions of the following substances are mixed. (Type your answer using the format CO2 for CO₂. If no precipitate forms, enter "none".)

Table 7.1

(a) sodium sulfate, Na₂SO₄, and calcium chloride, CaCl₂.
(No Response)
CaSO4

(b) ammonium iodide, NH₄I, and silver nitrate, AgNO₃
(No Response)
AgI

(c) potassium phosphate, K₃PO₄ and lead(II) nitrate, Pb(NO₃)₂
(No Response)
Pb3(PO4)2

(d) sodium hydroxide, NaOH, and iron(III) chloride, FeCl₃
(No Response)
Fe(OH)3

(e) potassium sulfate, K₂SO₄, and sodium nitrate, NaNO₃
(No Response)
none

(f) sodium carbonate, Na₂CO₃, and barium nitrate, Ba(NO₃)₂
(No Response)
BaCO3

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4. –/9 points ZumIntro5 15.036. My Notes

For each pair of concentrations, select which represents the more basic solution. Give the pH of each solution.

(a)	(I) [H⁺] = 1.59 10^-7 M (II) [H⁺] = 1.04 10^-8 M	pH_I = (No Response) 6.799 pH_II = (No Response) 7.983
(b)	(I) [H⁺] = 5.69 10^-8 M (II) [OH^-] = 4.49 10^-6 M	pH_I = (No Response) 7.245 pH_II = (No Response) 8.652
(c)	(I) [H⁺] = 5.99 10^-8 M (II) [OH^-] = 6.01 10^-7 M	pH_I = (No Response) 7.223 pH_II = (No Response) 7.779

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5. –/16 points ZumIntro5 17.042. My Notes

Balance each of the following half-reactions. (Use the lowest possible coefficients. Enter 0 where necessary.)

(a) (No Response)
1
N₂(g) + (No Response)
6
e^- (No Response)
2
N^3-(s) + (No Response)
0
e^-
(b) (No Response)
1
O₂^2-(aq) + (No Response)
0
e^- (No Response)
1
O₂(g) + (No Response)
2
e^-
(c) (No Response)
1
Zn(s) + (No Response)
0
e^- (No Response)
1
Zn²⁺(aq) + (No Response)
2
e^-
(d) (No Response)
1
F₂(g) + (No Response)
2
e^- (No Response)
2
F^-(aq) + (No Response)
0
e^-

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Zumdahl - Intro Chemistry: A Foundation 5/e (Homework)

Current Score : 32 / 34

Due : Thursday, April 9, 2020 08:00 EDT

Last Saved : n/a Saving... ()

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Assignment Submission

Assignment Scoring