PRE LAB

Pre-Lab Work Sheet 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 have higher melting and boiling points than covalent compounds. The electrostatic attraction in an ionic bond is very strong hence a lot of heat energy is required to break it down, ionic bonds have high melting and boiling points. In covalent bonds, the intermolecular forces are very weak and are easily broken, hence lesser heat is required and thus covalent bonds have lower melting and boiling points. 1. Do ionic compounds conduct electricity as: (3 points ) A. Solids? No B. Liquids? No C. Aqueous solutions (when the ionic compounds are dissolved in water)? Yes

2. Do covalent compounds conduct electricity as: (3 points ) A. Solids? B. Liquids? C. Aqueous solutions (when the covalent compounds are dissolved in water)?
03.06 Covalent Bonding and Lewis Structures: Lab and Rubric
Part I: Lab

Insert completed data tables for each part of the lab. Be sure that the data tables are organized and include units when necessary.

Melting Point (4 points)
a. 600°c
b. 200°c
c. 250°c
d. 130°c Conductivity (4 points)

Substance 1 conductive a solid no

b liquid no c aqueous yes Substance 2 conductive a solid no

b liquid no c aqueous no Substance 3 conductive a solid no

b liquid yes c aqueous yes Substance 4 conductive a solid no

b liquid no c aqueous no Part II: Conclusion

Answer the following questions in your own words, using complete sentences.

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)
1.they are all ionic because edo not allow as a