3 06 Covalent And Ionic Properties Lab Worksheet

Name: Yaissa Fernandez 3.06: Lab and Guided Lab Report

Part I: Prelab
Research the answers to the following questions on the internet, and write your answers in your own words. For each answer, include the address of the website (or title and author of a book or article) that you used to help you answer the question.

1. Which type of compound usually has higher melting points, ionic compounds or covalent compounds? What is the reason for this difference in melting points? (3 points)
Ionic compounds usually have higher melting points. This is because the atoms of covalent compounds are bound strongly to each other in stable molecules, but those molecules are in general not very strongly attracted to other molecules in the compound. On the other hand, the atoms in ionic compounds show strong attractions to other ions in their vicinity. http://hyperphysics.phy-astr.gsu.edu/hbase/chemical/bond2.html

2. Do ionic compounds conduct electricity as: (3 points)
a. Solids? No
b. Liquids? Yes
c. Aqueous solutions (when the ionic compounds are dissolved in water)? Yes http://misterguch.brinkster.net/ionic.html 3. Do covalent compounds conduct electricity as: (3 points)
a. Solids? No
b. Liquids? No
c. Aqueous solutions (when the covalent compounds are dissolved in water)? No http://misterguch.brinkster.net/covalentcompounds.html Part II: Lab
Insert completed data tables for each part of the lab. Be sure that the data tables are organized and include units when necessary.

1. Melting Point (4 points)

Part 1 – Melting Points
Substance
Melting Point
A
Higher than 300 c
B
200 c
C
Higher than 300 c
D
120 c

2. Conductivity (4 points)

Part 2 – Conductivity
Substance A
Conductivity

Substance B
Conductivity
Solid no Solid no Liquid yes Liquid no Aqueous yes Aqueous no Substance C
Conductivity

Substance D
Conductivity
Solid no Solid no Liquid yes Liquid no Aqueous yes Aqueous no Part III: Conclusion
Answer the following questions in your