2. Chem 111 Student Lab 2 Redox

2. Chem 111 Student Lab 2 Redox - The Redox Arena 1...

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Unformatted text preview: The Redox Arena 1 Cornerstone Chemistry The Redox Arena Redox is a compressed way of writing reduction and oxidation. Reduction refers to an atom gaining electrons and oxidation involves an atom losing electrons. Together, this process is very telling, in that it points to a very important aspect of chemical change: the electrons. For a reaction to occur, new bonds must form between atoms. It is the ability of electrons to be shared or transferred between atoms that cause new bonds to form. The electron, more so than the proton or neutron, is the active player in the arena of chemical change. 2 The Redox Arena Cornerstone Chemistry FOCUS QUESTIONS: Part 1 1. What happens Qualitatively on both the Macroscopic and Atomic Levels when Zinc, Iodine and Water are mixed? Does a Reaction occur? 2. If a Reaction does take place, are the Physical and Chemical Properties of the Substances, isolated during and after the mixing, the Same as or Different from those of Iodine and Zinc? Explain. 3. What are the Identities of the Three Substances that were Isolated? First, Last and Always We will be spending a lot of time with zinc and iodine, as well as some common reagents, so I want to let you know how you should handle and dispose of them. Safe Handling 1. Iodine is a moderately corrosive substance and will stain the hands so do not pick up pieces if spilled. Always use a dust pan. Iodine stains of the skin can be removed with a solution of sodium thiosulfate which will be supplied in the lab. If you notice any stains on your body or clothes outside lab, apply rubbing alcohol to the area and rinse off with water. Clean off any spatulas which have come into contact with iodine. If you ever observe the formation of a purple gas, immediately remove the vessel to the hood. 2. Silver nitrate will stain the skin; the stains are not hazardous. 3. 6 M hydrochloric acid solution can harm the skin if left untreated. If contact with the skin occurs, wash with running water for at least 5 minutes. The Redox Arena 3 Cornerstone Chemistry Disposal 1. All solutions can be diluted with water and disposed of down the drain (run the faucet for a few minutes) with the exception of the orange brown iodine-iodine-triiodide solution. This substance will be collected in a waste beaker. 2. All solids do not go down the drain. They will be collected in waste beakers. A Pre-Lab Checklist Review Tools 1-6 in your first lab; Read Tool 9 Summarize or Flow Diagram Procedures for Parts 1 and 2. Hand in Summary. The Details: Before everything else: Observe and record the physical appearance of all chemicals used in this experiment: In Library of chemists we told you what chemicals to consider this time you need to think about the experiment and make your own observations. Remember that you need to record ALL chemicals that you use in the lab....
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2. Chem 111 Student Lab 2 Redox - The Redox Arena 1...

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