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Chemical Reactions Lab

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Jack Zhou
Eric Lonrenzo
Chemistry section #
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Chemical Reactions
Introduction: The purpose of the lab was to create and observe the 4 kinds of chemical equation, and to identify reactants and products of those reactions. The four kinds of chemical reactions are synthesis, decomposition, single-displacement and double-displacement.

Materials: Bunsen burner, sparker, tongs, 5 test tubes, scoop, wooden splint, lead(II)nitrate, magnesium wire, copper(II) carbonate, hydrochloric acid, zinc, potassium iodide, test tube tack, googles, apron, gloves and a metal test tube holder.
Methods:
Experiment 1: Synthesis 1, Obtain a piece of magnesium wire. 2, Light the Bunsen burner
3, using the tongs, hold the wire in the flame of the burner. Do not …show more content…

Experiment 2: Decomposition 1, place two scoops of cooper (II) carbonate in a test tube.
2, Heat the test tube with the sample for three minute. Do not point the test tube toward anyone.
3, remove the tube from the burner and light the wooden splint. Insert it into the test tube and observe the reaction
Experiment 3: Single-displacement 1, Put about 5mLs of hydrochloric acid into a test tube and place it in a test tube rack. 2, add a piece of Zinc and invert another test tube over this one and observe 3, Look for gas being released, and tries to collect this gas.
4, keep the tube with the gas inverted. Insert a glowing splint into the test tube and observe the reaction.
Experiment 4: Double-displacement 1, obtain two test tubes. Place 2mLs of potassium iodide into one of them. 2, in the second, place 3 mLs of Lead (II) nitrate. 3, slowly pour the lead (II) nitrate into the potassium …show more content…

After the reaction, the remaining aluminum was blacked and bubbled. Heat was also produced by the reaction, its chemical equation is 2Al + 3CuCl2 ----> 3Cu + 2AlCl3.
The fours experiment was complex and is Pb(NO3)2(aq) + 2KI(aq) ----> PbI2(s) + 2KNO3(aq), it is a reaction became the color of the solution turned yellow.
Discussions. The first experiment was clearly a synthesis, as the Magnesium and the flame reacted and combined, forming 2MgO. The reason of the 2 Mg is because all chemical equation must be balanced, and the total electron number must be zero. A O have a -2 charge, while Mg have a +1 charge. The sign that this was a chemical reaction is the formation of a new solid, and the flashes and heat produced during the reaction.
The second lab was a decomposition, as when the Copper (II) dioxide was heated, it broke down into carbon dioxide and Cupper (II) oxide. It fit into the AB-->A+B formula for decomposition. The indicator that a reaction had occurred is the smell and the change of color.
The third experiment was a single displacement reaction, as it fit into the AB+C-->AC+B formula.The Al was added with CL, while the CuCl just became Cl. Of courses that wasn’t the equation as it still needs to be balanced of the

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