Zumdahl - Intro Chemistry: A Foundation 4/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 5 / 50

Due : Thursday, April 9, 2020 09:00 EDT

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

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Total

5/50 (10.0%)

Instructions

Here are some textbook questions from Introductory Chemistry: A Foundation 4/e by Zumdahl and Zumdahl published by Houghton Mifflin. Click here for a list of all of the questions coded in WebAssign. This demo assignment allows many submissions and makes the answer key available after the first submission so you can see the correct answers. (Typically, the answer key is posted after the due date!)

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For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.

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1. –/8 points ZumIntro4 2.008. My Notes

Express each of the following numbers in standard scientific notation.

(a) 9367549 (No Response) 9.367549e+06	(b) 7231 (No Response) 7.231e+03
(c) 0.0005650 (No Response) 5.650e-04	(d) 5.508 (No Response) 5.508e+00
(e) 6.63 10² (No Response) 6.63e+02	(f) 6427 10^-2 (No Response) 6.427e+01
(g) 0.000000007189 (No Response) 7.189e-09	(h) 0.755 (No Response) 7.55e-01

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2. –/1 points ZumIntro4 2.036. My Notes

Why can the length of the pin shown in Figure 2.5 not be recorded as 2.850?

Figure 2.5

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. 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.

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3. –/7 points ZumIntro4 5.050. My Notes

Write the formula for each of the following compounds that contain polyatomic ions. Be sure to enclose the polyatomic ion parentheses if more than one such ion is needed. (Type your answer using the format Cr(CN)3 for Cr(CN)₃.)

(a) manganese(II) sulfate
(No Response)
MnSO4

(b) hydrotelluric acid
(No Response)
H2Te -or- H2Te(aq)

(c) magnesium hydrogen sulfate
(No Response)
Mg(HSO4)2

(d) cobalt(III) nitrate
(No Response)
Co(NO3)3

(e) cesium perchlorate
(No Response)
CsClO4

(f) lithium peroxide
(No Response)
Li2O2

(g) sodium hydrogen phosphate
(No Response)
Na2HPO4

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4. –/18 points ZumIntro4 7.022. My Notes

5. –/16 points ZumIntro4 9.024. My Notes

For each of the following unbalanced chemical equations, calculate how many moles of the second reactant would be required to react completely with exactly 21.8 g of the first reactant. Indicate clearly the mole ratio used for each conversion.

(a) Mg(s) + CuCl₂(aq) MgCl₂(aq) + Cu(s)
(No Response)
0.897
mol Mg ✕ (No Response)
1 mol CuCl2
/ (No Response)
1 mol Mg
= (No Response)
0.897
mol CuCl₂
(b) AgNO₃(aq) + NiCl₂(aq) AgCl(s)+ Ni(NO₃)₂(aq)
(No Response)
0.128
mol AgNO₃ ✕ (No Response)
1 mol NiCl2
/ (No Response)
2 mol AgNO3
= (No Response)
0.0642
mol NiCl₂
(c) NaHSO₃(aq) + NaOH(aq) Na₂SO₃(aq) + H₂O(l)
(No Response)
0.209
mol NaHSO₃ ✕ (No Response)
1 mol NaOH
/ (No Response)
1 mol NaHSO3
= (No Response)
0.209
mol NaOH
(d) KHCO₃(aq) + HCl(aq) KCl(aq) + H₂O(l) + CO₂(g)
(No Response)
0.218
mol KHCO₃ ✕ (No Response)
1 mol HCl
/ (No Response)
1 mol KHCO3
= (No Response)
0.218
mol HCl

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Zumdahl - Intro Chemistry: A Foundation 4/e (Homework)

Current Score : 5 / 50

Due : Thursday, April 9, 2020 09:00 EDT

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

Instructions

Assignment Submission

Assignment Scoring