WebAssign

Saturday, November 21, 2009 05:20 EST

Logged in as demo@demo

Logout

Home | My Assignments | Grades | Communication | Calendar

Guide | Help | My Options

Ebbing and Gammon - General Chemistry 6/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 0/25

Due: Thursday, September 9, 2010 08:30 EDT

About this Assignment

Question

Points

1	2	3	4	5
0/1	0/15	0/5	0/1	0/3

Total

0/25

Description

Here are some textbook questions from General Chemistry 6/e by Ebbing and Gammon published by Houghton Mifflin. Click here for a list of all of the questions coded in WebAssign.

Instructions

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!)

1. 0/1 points All Submissions Notes Question: EbGam6 1.GP.083.

Question part

Points

Submissions

1
0/1
1/50

Total

0/1

Sodium metal reacts vigorously with water. A piece of sodium weighing 20.74 g was added to a beaker containing 126.22 g of water. During reaction, hydrogen gas was produced and bubbled from the solution. The solution, containing sodium hydroxide, weighed 131.78 g. How many grams of hydrogen gas were produced?
Your answer is incorrect.

15.2

2. –/15 points Notes Question: EbGam6 2.PP.050.

Question part

Points

Submissions

1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
0/1	0/1	0/1	0/1	0/1	0/1	0/1	0/1	0/1	0/1	0/1	0/1	0/1	0/1	0/1
0/50	0/50	0/50	0/50	0/50	0/50	0/50	0/50	0/50	0/50	0/50	0/50	0/50	0/50	0/50

Total

0/15

Refer to the periodic table (Figure 2.14 or inside front cover) and determine the period, group, and whether the element is a metal, nonmetal, or metalloid.

Figure 2-14.

(a) In
period
Answer is not case sensitive.
1
group
Answer is not case sensitive.
2
type
Answer is not case sensitive.
3
(b) Te
period
Answer is not case sensitive.
4
group
Answer is not case sensitive.
5
type
Answer is not case sensitive.
6
(c) Ga
period
Answer is not case sensitive.
7
group
Answer is not case sensitive.
8
type
Answer is not case sensitive.
9
(d) F
period
Answer is not case sensitive.
10
group
Answer is not case sensitive.
11
type
Answer is not case sensitive.
12
(e) H
period
Answer is not case sensitive.
13
group
Answer is not case sensitive.
14
type
Answer is not case sensitive.
15

3. –/5 points Notes Question: EbGam6 3.PP.038.

Question part

Points

Submissions

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

Total

0/5

Calculate the following.

(a) number of atoms in 26.9 g Al
Enter a number.
1 atoms
(b) number of atoms in 7.92 g I₂
Enter a number.
2 atoms
(c) number of molecules in 15.4 g N₂O₅
Enter a number.
3 atoms
(d) number of formula units in 3.31 g NaClO₄
Enter a number.
4 atoms
(e) number of Ca²⁺ ions in 3.51 g Ca₃(PO₄)₂
Enter a number.
5 atoms

4. –/1 points Notes Question: EbGam6 4.PP.062.

Question part

Points

Submissions

1
0/1
0/50

Total

0/1

How many milliliters of 0.120 M HClO₄ (perchloric acid) are required to give 0.00752 mol HClO₄?
mL

5. –/3 points Notes Question: EbGam6 5.GP.115.

Question part

Points

Submissions

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

Total

0/3

A 40.62 mL sample of a 0.1250 M acid reacts with an excess of Na₂CO₃ to form 150.0 mL CO₂ at 696 mmHg and 27°C. If the acid is either HCl or H₂SO₄, which is it?

H₂SO₄ HCl

(Give the number of moles of acid and base that react, to justify your answer.)
moles (acid)
moles (base)

Home My Assignments