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4.05 Chemical Reactions: Combustion

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gabriela cardenas

on 25 October 2014

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Transcript of 4.05 Chemical Reactions: Combustion

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 I were to measure the mass of magnesium and hydrochloric acid before combining them in the test tube, the mass compared to the mass of the reactants left in the test tube after the reaction would overall be the same. The Law of conservation of mass states that "matter can be changed from one form into another, mixtures can be separated or made, and pure substances can be decomposed, but the total amount of mass remains constant." Thus, the mass would be the same as the total of the individual substance.
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?
The reaction that I conducted that can be categorized as two types of reactions is the magnesium burning on the bunsen burner. This reaction can be categorized as either a combustion or synthesis. Thus, in the end, my prediction of the reaction type was correct.
Data & Observations:
Complete a data table that includes a prediction of reaction type (single replacement, double replacement, synthesis, decomposition, or combustion), observations, and identification of reaction type for each reaction in the lab.
Write a balanced equation for each reaction observed in this lab.
4.05 Chemical Reactions:
Combustion Assessment
4.05 Chemical Reactions: Combustion
Gabriela Cardenas
Iron (III) and copper (II) sulfate solution
2Fe+3CuSO4 = Fe2(SO4)3 + 3Cu
Lead (II) nitrate and potassium iodide solutions
Pb(NO3)2+2KI = PbI2+2KNO3
Magnesium metal and hydrochloric acid solution
Mg+2HCl = MgCl2+H2
Electrolysis of water
2H2O = 2H2+O2
Burning magnesium
2Mg+O2 = 2MgO
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