Classifying chemical reaction

Topics: Sodium hydroxide, Chemical reaction, Chlorine Pages: 8 (2467 words) Published: March 1, 2014
Classifying Chemical Reactions

Pre-lab questions
1. Which reactants used in this experiment are flammable? Discuss the safety precautions that are necessary when working with flammable materials in the lab? 2. Summarize the following description of a chemical reaction in the form of a balanced chemical equation? 3. Common observations of a chemical reaction are described in the introduction section. For each observation, name a common or everyday occurrence that must involve a chemical reaction? Research question

What is the appearance of reactant, Evidence of chemical reaction, and properties of a product? Background information
The experiment is to observe a variety of chemical reactions and to identify patterns in the observation of reactants into products. The properties of the reactions will be analyzed to classify the chemical reactions into different groups. Hypothesis

Reaction 1- My hypothesis for reaction 1 is that the magnesium ribbon will crumble. The explanation i have for this is that i when you put a object long enough on a fire it will probably crumble. Reaction 2- My hypothesis for reaction 2 is that the magnesium metal ribbon will make. The test tube will become hot. When a burning wood split is placed in the mouth of the tube, the flame goes out and the remains go in the tube. Reaction 3- My hypothesis for reaction 3 is that the moistened litmus paper changes color. The odor will be a chemical odor that smells bad. The burning splint will be extinguished. Reaction 4- My hypothesis for reaction 4 is that adding hydrochloric acid to solid calcium carbonate produces bubbles maybe. When burning the splint is placed on the test tube, the flame is extinguished. Reaction 5- My hypothesis for reaction 5 is that mozzy zinc in the test tube will make smoke come out of the tube Reaction 6 - My hypothesis for reaction 6 is that when you add the 0.5 M of copper (11) chloride and mix it with the 0.5 M of sodium phosphate they will change colors. Reaction 7- My hypothesis for reaction 7 is when drop 1M of hydroxide into the pipet then add 1 drop of phenolphthalein the phenolphthalein will neutralize the hydroxide and cause it to remain one color. Reaction 8- My hypothesis for reaction 8 is that when you place the ethyl alcohol under the fire it will cause the alcohol to evaporate.

Ammonium carbonate, 0.5 g
Calcium carbonate, 0.5 g
Copper (11) chloride solution, 0,5 M, 4 mL
Ethyl alcohol, 1 mL
Hydrochloric acid, 1M, 4mL
Magnesium ribbon, 2-4 cm strips, 2
Phenolphthalein indicator, 1 drop
Sodium hydroxide solution, 1 M, 1mL
Sodium phosphate solution, 0.5 M, 1ml
Water, distilled
Zinc, mossy, or zinc shot, 1-2 pieces
Busen or laboratory burner
Butane safety lighter
Evaporating dish, porcelain
Forceps or crucible tongs
Heat- resistant pad
Litmus paper
Pipets, beral-type,6
Test tubes, small, 6
Test tube clamp
Test tube rack
Wash bottle
Wood splints ,3

Chemical inventory:
Ethyl alcohol is a flammable solvent and a dangerous fire risk. Copper(11) chloride solution is toxic by ingestion
Addition of denaturant makes ethyl alcohol poisonous
Hydrochloric acid and sodium hydroxide solutions are corrosive liquids. Phenolphthalein is an alcohol- based solution and is flammable; it is moderately toxic by ingestion Magnesium metal is flammable solid and zinc metal may contain flammable dust Solvent bottles should be kept capped at all times and must be removed from the work area when using the laboratory burner

Safety precautions:
Keep away from flames and other sources of ignition
Notify the teacher and clean up all spills immediately
Avoid contact of all chemicals with eyes and skins.
Wear chemical splash goggles and chemical resistant gloves and apron. Wash hands thoroughly with soap and water before leaving the lab

Reaction 1- 1. Obtained a 3-4 cm strip of magnesium metal ribbon. Held the piece of magnesium with...
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