Prelab 5 - Halogens - Fundamentals Chemistry | CHEM 105, Lab Reports of Chemistry

Download Prelab 5 - Halogens - Fundamentals Chemistry | CHEM 105 and more Lab Reports Chemistry in PDF only on Docsity!

Prelab #5—Halogens Lab Name _______________

Lab section: M T W Th F

Prelab #5—Halogens Lab

Reading Assignment:

1. Description of experiment.
2. The Group 7A Elements—Zumdahl, sec. 19.7, pp. 914–921.
3. Periodic Properties—Zumdahl, sec. 12.15, pp. 560–568.
4. Review Oxidation-Reduction Reactions—Zumdahl, sec. 4.10–4.11, pp. 115–129. Questions:

1. Make a list of all halogens and halide salts being used in this experiment giving

proper names of each. Give the physical state (solid, liquid, or gas) in which the halogens are found at room temperature.

2. Write the balanced net ionic equation for the reaction of chlorine (Cl2(aq)) with sodium bromide (NaBr(aq)) to form bromine (Br2(aq)) and chloride ions (Cl–(aq)). In aqueous solution, NaBr forms ions Na+(aq) and Br–(aq). Net ionic equation means that spectator ions (ions that do not participate in the reaction and are the same on both sides of the reaction) are not included.

3. The halogens and halides are members of the Group 17 (or Group 7a) elements and exhibit reactivities based on their position in the periodic table. The halogens and halides participate in reduction - oxidation (redox) reactions that involve the exchange of electrons. The upcoming experiment examines the ability of a given halogen to oxidize a given halide. Trends in the periodic table permit prediction of the outcome and also explain the reactivities as you go down a group. To gain knowledge on the tendencies of the group 17 elements visit the following website: www.chemguide.co.uk/inorganic/group7menu.html. Focus on the sections entitled: Atomic and Physical Properties and Halogens as Oxidizing Agents. Fill in the blanks in the following summary: Halogen Halide salt Physical state at room temperature