WebAssign is not supported for this browser version. Some features or content might not work. System requirements

WebAssign

Welcome, demo@demo

(sign out)

Tuesday, April 22, 2025 11:20 EDT

Home My Assignments Grades Communication Calendar My eBooks

Webassign - NC Essential Standards: Chemistry 1/e (Homework)

James Finch

Chemistry - HS, section 1st period, Fall 2019

Instructor: Dr. Friendly

Current Score : 12 / 23

Due : Monday, October 28, 2019 16:00 EDT

Last Saved : n/a Saving...  ()

Print Assignment
Question
Points
1 2 3 4 5 6 7
–/3 –/1 –/1 –/4 –/1 –/5 –/8
Total
12/23 (52.2%)

  • Instructions

    The North Carolina Essential Standards for High School Chemistry Question Collection contains more than 400 peer-reviewed questions that focus on practice and support for the particular skills identified by the North Carolina Department of Public Instruction in the Science Essential Standards for Chemistry. Use WebAssign to easily augment your assignments with questions organized to match these standards and reinforce concepts through our robust analytics and reporting tools.

    Question Features
    • Integrated feedback for every incorrect answer
    • Links to stepped-out concept-mastery tutorials for every question
    • Deep Help Links to stepped-out tutorials
    • Detailed solutions for all questions available to students at your discretion
    For more information on adding this question collection to your WebAssign course, contact us today.

    View the complete list of WebAssign questions available for this textbook. This demo assignment allows many submissions and allows you to try another version of the same question for practice wherever the problem has randomized values.

    The answer key and solutions will display after the first submission for demonstration purposes. Instructors can configure these to display after the due date or after a specified number of submissions.

Assignment Submission

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.

Assignment Scoring

Your last submission is used for your score.

1. –/3 points NCEssChem1 1.1.001. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/100 0/100 0/100
Total
–/3
 
Consider the atom represented by 4119K.
(a) What is the atomic number of this atom?
(No Response)

(b) What is the mass number of this atom?
(No Response)

(c) How many neutrons are in this atom?
(No Response)

Supporting Materials

Additional Materials

Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
2. –/1 points NCEssChem1 1.1.010. My Notes
Question Part
Points
Submissions Used
1
–/1
0/100
Total
–/1
 
What is the energy of a photon of violet light with a frequency of 7.72 ✕ 1014 s−1?
WebAssign will check your answer for the correct number of significant figures.(No Response) J

Supporting Materials

Additional Materials

Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
3. –/1 points NCEssChem1 1.2.005. My Notes
Question Part
Points
Submissions Used
1
–/1
0/100
Total
–/1
 
Choose from the list below three pairs of elements that will form molecular compounds. (An element may be chosen more than once. Select all that apply.)
phosphorus (P)
manganese (Mn)
barium (Ba)
cesium (Cs)
xenon (Xe)
bromine (Br)


Supporting Materials

Additional Materials

Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
4. –/4 points NCEssChem1 1.1.002. My Notes
Question Part
Points
Submissions Used
1 2 3 4
–/1 –/1 –/1 –/1
0/100 0/100 0/100 0/100
Total
–/4
 
Write the symbol for each of the following particles.
(a) an atom with 16 protons and 16 electrons

chemPad

Help

 

(b) a magnesium atom that has lost 3 electrons

chemPad

Help

 

(c) an iodine atom that has gained 1 electron

chemPad

Help

 

(d) a silicon atom with 15 neutrons in its nucleus (Enter your answer using the format AX.)

chemPad

Help

 

Supporting Materials

Additional Materials

Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
5. –/1 points NCEssChem1 1.2.012. My Notes
Question Part
Points
Submissions Used
1
–/1
0/100
Total
–/1
 
List all possible unit formulas (chemical formulas) that can be constructed by the formation of binary ionic compounds from the following elements. (Separate substances in a list with a comma.)
I (Z = 53),
O (Z = 8),
Ba (Z = 56),
Ga (Z = 31),
Ca (Z = 20)

chemPad

Help

 

Supporting Materials

Additional Materials

Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
6. –/5 points was NCEssChem1 1.2.RE.014. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5
–/1 –/1 –/1 –/1 –/1
0/100 0/100 0/100 0/100 0/100
Total
–/5
 
    An element X, which occupies group number 2 and period number 2, reacts with another element Y, which occupies group number 17 and period number 3. This reaction produces a compound Z.
    (a) Identify the elements X and Y as well as the compound Z.

    (b) Identify the type of bond in compound Z.

    (c) Write the reaction among elements X and Y that produces compound Z.

  • Step 1 of 5

    (a) Identify the elements X and Y as well as the compound Z.

    Write the element X that occupies group number 2 and period number 2.
    The element X that occupies group number 2 and period number 2 is (No Response) .

  • Step 2 of 5

    Write the element Y that occupies group number 17 and period number 3.
    The element Y that occupies group number 17 and period number 3 is (No Response) .

  • Step 3 of 5

    Identify compound Z.
    Remember that chlorine normally exists as the diatomic molecule Cl2, Be reacts with Cl2 to form beryllium chloride. Therefore, the formula of compound Z is the following.

    chemPad

    Help

     

  • Step 4 of 5

    (b) Identify the type of bond in compound Z.

    Identify the type of bonding that occurs in compound Z.
    Because Be and Cl are in the same period, and electronegativity increases from left to right across a period, Be is much less electronegative than Cl. Atoms with large differences in electronegativity most often form (No Response) bonds with each other.

  • Step 5 of 5

    (c) Write the reaction among elements X and Y that produces compound Z.

    Write the reaction of beryllium with chlorine.
    Beryllium has 2 valence electrons, while each of the two chlorine atoms have 7 valence electrons. To satisfy the octet rule, beryllium will transfer its 2 valence electrons to Cl2, one to each chlorine atom. This transfer will also allow both chlorine atoms to achieve the octet form. The transfer forms the ions Be2+ and Cl −, which bond together to form BeCl2.

    Write the balanced chemical reaction between Be and Cl2 that forms BeCl2. (Omit states-of-matter from your answer.)

    chemPad

    Help

     



    Write a chemical equation for a chemical reaction without showing coefficients.
Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
7. –/8 points NCEssChem1 1.SA.2.002. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6 7 8
–/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1
0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100
Total
–/8
 
This question has several parts that must be completed sequentially. If you skip a part of the question, you will not receive any points for the skipped part, and you will not be able to come back to the skipped part.

Tutorial Exercise
Which is stronger, the carbon-oxygen bond in carbon dioxide (CO2) or the carbon-oxygen in methanol (CH3OH)?
Step 1 of 3
Draw the Lewis structures of the substances.
The Lewis structure for CO2 is the following. (Assign lone pairs and radical electrons where appropriate.)
(No Response)
The Lewis structure for CH3OH is the following. (Assign lone pairs and radical electrons where appropriate.)
(No Response)


Determine the Lewis structure of a substance.


Supporting Materials

Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
Home My Assignments