Essay on Lab Report

637 Words May 7th, 2013 3 Pages
Richmonde Zegbe
CHM111
Anita Mohan
03-11-2013

Experiment: Chemical reactions, and Equations

Materials:
3 mL of copper(II) sulfate solution. 5 mL of 6 M HCl piece of zinc wooden splint test tube Bunsen burner 3 mL of zinc chloride solution. pentahydrate distill water 0.1 g of ammonium dichromate phenolphthalein tongs strip of magnesium spatula
NaOH
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Add a dropperful of 1.0 M hydrochloric acid.

PART 2: Redox Reactions
Combination reactions

A1.Work under the hood! With a pair of tongs, hold a strip of magnesium in a bunsen burner flame. Do not look directly at the flame. Save the ash in a small beaker for the next procedure. If magnesium is substance "A" in the general equation, what is "B"?
A2. Add a dropperful of distilled water and a drop of phenolphthalein. The phenolphthalein is only an indicator for the presence of hydroxide ion and does not enter into the equation. Decomposition reactions
B1. Work under the hood! Weigh out exactly 0.1 g of ammonium dichromate and add to a test tube. Clamp and warm gently with a Bunsen burner. Two of the products of this reaction are chromium(III)oxide and nitrogen gas. Watch for evidence of the third product.
B2.Place a few crystals of copper(II)sulfate pentahydrate in a test tube. Clamp the tube and heat in a horizontal position. One of the products is copper(II)sulfate. What is the other one? This decomposition reaction is easily reversible. Add a dropperful of water to the tube when it cools. Record what happens.

Replacement reactions
C1.Work under the hood! Place a piece of zinc in a test tube. Add about 5 mL of 6 M HCl and allow the zinc to effervesce. Ignite a wooden splint in a Bunsen burner flame and hold this flame to the mouth of the test tube. If hydrogen is generated as one of the

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