Brown, LeMay, Bursten - Chemistry 10/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 15/24

Due: Wednesday, August 25, 2010 08:00 EDT

Question

Points

1	2	3	4	5
7	2/3	6	0/6	0/2

Total

15/24

Description

Here are some textbook questions from Chemistry: The Central Science 10/e by Brown, LeMay, and Bursten published by Prentice Hall. Click here for a list of all of the questions coded in WebAssign.

Instructions

This demo assignment allows many submissions and allows you to try another version of the same question for practice.

1. 7/7 points All Submissions Notes Question: BLB10 1.P.063.

Question part

Points

Submissions

1	2	3	4	5	6	7
1	1	1	1	1	1	1
11/50	6/50	11/50	1/50	1/50	1/50	1/50

Total

7/7

What type of quantity (for example, length, volume, density) do the following units indicate?

(a) mL 1	(b) cm² 2	(c) mm³ 3
(d) mg/L 4	(e) ps 5	(f) nm 6
(g) K 7

2. 2/3 points All Submissions Notes Question: BLB10 3.P.064.

Question part

Points

Submissions

1	2	3
1	1	0/1
1/50	1/50	1/50

Total

2/3

The complete combustion of octane, C₈H₁₈, a component of gasoline, proceeds as is shown below.

2 C₈H₁₈(l) + 25 O₂(g) 16 CO₂(g) + 18 H₂O(l)

(a) How many moles of O₂ are needed to burn 1.90 mol of C₈H₁₈?
Enter a number with the correct number of significant figures.
1 mol
(b) How many grams of O₂ are needed to burn 1.00 g of C₈H₁₈?
Enter a number with the correct number of significant figures.
2 g
(c) Octane has a density of 0.692 g/mL at 20°C. How many grams of O₂ are required to burn 1.60 gal of C₈H₁₈?
Enter a number with the correct number of significant figures.
3 g

3. 6/6 points All Submissions Notes Question: BLB10 4.P.018.

Question part

Points

Submissions

1	2	3	4	5	6
1	1	1	1	1	1
1/50	1/50	1/50	1/50	1/50	1/50

Total

6/6

Methanol, CH₃OH, is a nonelectrolyte; acetic acid, HC₂H₃O₂, is a weak electrolyte; and calcium hydroxide, Ca(OH)₂, is a strong electrolyte. What are the solute particles present in aqueous solutions of each compound? (Select all that apply.)

methanol	acetic acid	calcium hydroxide
1 H⁺ CH₃OH OH ^- CH₃OH₂⁺ O^2- CH₃O^-	2 HC₂H₃O₂ O^2- H⁺ HC₂H₃O²⁺ OH ^- C₂H₃O₂^-	3 Ca(OH)₂ H⁺ CaOH⁺ Ca(OH)₃^- Ca²⁺ OH ^-

If 0.1 mol of each compound is dissolved in solution, which one contains 0.3 mol of solute particles, which contains 0.1 mol of solute particles, and which contains somewhere between 0.1 and 0.3 mol of solute particles?

0.3 mol solute particles 4

0.1 mol solute particles 5

between 0.1 and 0.3 mol solute particles 6

4. –/6 points Notes Question: BLB10 8.P.018.

Question part

Points

Submissions

1	2	3	4	5	6
0/1	0/1	0/1	0/1	0/1	0/1
0/50	0/50	0/50	0/50	0/50	0/50

Total

0/6

Write electron configurations for the following ions, and determine which have noble-gas configurations. (Type your answer using the format [Ar] 4s2 3d10 4p2 for [Ar]4s²3d¹⁰4p². If the configuration is a noble gas, enter the noble gas in brackets, for example [Ne] for F ^-.)

(a) In²⁺
Answer is case sensitive.
1
(b) Sc³⁺
Answer is case sensitive.
2
(c) Pb²⁺
Answer is case sensitive.
3
(d) Cd²⁺
Answer is case sensitive.
4
(e) Ga³⁺
Answer is case sensitive.
5
(f) Te^2-
Answer is case sensitive.
6

5. 0/2 points All Submissions Notes Question: BLB10 21.P.024.

Question part

Points

Submissions

1	2
0/1	0/1
4/50	0/50

Total

0/2

Which of the following nuclides would you expect to be radioactive? (Select all that apply.)

Justify your choices.

0.3 mol solute particles	4
0.1 mol solute particles	5
between 0.1 and 0.3 mol solute particles	6

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Brown, LeMay, Bursten - Chemistry 10/e (Homework)

Current Score: 15/24