3 06CovalentandIonicPropertiesLabWorksheet

Name: _______________________ 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)

2. Do ionic compounds conduct electricity as: (3 points)
a. Solids?
b. Liquids?
c. Aqueous solutions (when the ionic compounds are dissolved in water)?

3. Do covalent compounds conduct electricity as: (3 points)
a. Solids?
b. Liquids?
c. Aqueous solutions (when the covalent compounds are dissolved in water)?

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.

Part 1 – Melting Points
Substance
Melting Point
A

B

C

D

Part 2 – Conductivity
Substance A
Conductivity

Substance B
Conductivity
Solid

Solid

Liquid

Liquid

Aqueous

Aqueous

Substance C
Conductivity

Substance D
Conductivity
Solid

Solid

Liquid

Liquid

Aqueous

Aqueous

1. Melting Point (4 points)

2. Conductivity (4 points)

Part III: Conclusion
Answer the following questions in your own words, using complete sentences.
1. Based on your observations in the lab, categorize each unidentified compound as ionic or covalent. Explain in one or two sentences why you categorized the compounds the way that you did. (5 points)

2. Explain, in your own words, the differences between ionic and covalent bonding that account for the differences in their melting points. (4 points)

3. In order to conduct an electrical current, a substance must have charged particles (ions or electrons) that are free-moving, or able to move about throughout the sample.

a. Why do you think