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04.05 Chemical Reactions: Combustion

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Tanairi Jimenez

on 18 November 2014

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Transcript of 04.05 Chemical Reactions: Combustion

1.Iron (III) and copper (II) sulfate solution
Fill a small test tube halfway with copper (II) sulfate solution. Add a 2.0 gram iron rod to the solution and observe the reaction.

2.Lead (II) nitrate and potassium iodide solutions
Pour about 2.0 mL of lead (II) nitrate into the test tube. Add 5 to 10 drops of potassium iodide solution to the test tube and record your observations of the reaction.

3.Magnesium metal and hydrochloric acid solution
Place one scoop of magnesium turnings into the test tube. Add hydrochloric acid slowly and observe the reaction. Next, place a burning splint near the mouth of the test tube to test for the presence of hydrogen gas.

4.Electrolysis of water
Use a U-tube with electrodes at each end, connected to a battery. Fill the U-tube with water. Turning on the battery, observe the results at each electrode. Next, test for hydrogen and oxygen gas produced at each end of the tube.

5.Burning magnesium
Place magnesium ribbon in a clean crucible (on a clay triangle above a Bunsen burner). Heat until the magnesium begins to burn.

1.Write a balanced equation for each reaction observed in this lab.
1) 2Fe + 3CuSO4 ---> Fe2(SO4)3 +3Cu
2) Pb(NO3)2 + 2KI ---> PbI2 + 2KNO3
3) Mg + 2HCl ---> MgCl2 + H2
4) 2H2O ---> 2H2 + O2
5) 2Mg + O2 ---> 2MgO
2.If you were to measure the mass of magnesium and hydrochloric acid before combining them in the test tube, how would that mass compare to the mass of reactants left in the test tube after the reaction? Explain your answer and how it corresponds to the law of conservation of mass.
If you were to measure the mass of magnesium and hydrochloric acid before combining them in the test tube the result would still be the same as measuring them after the reaction because according to the Law of Conservation of mass, energy can't be created nor destroyed but only changed.
3.One of the reactions you conducted can actually be categorized as TWO different types of reactions. Which reaction is this, and what are the two types of reactions?
Magnesium being burn can be categorized as synthesis producing metalhydroxides and combustion
04.05 Chemical Reactions: Combustion
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