CHEM 101 Pierce College Determining the Molar Mass of A Metal Lab Questions

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chem 101

Los Angeles Pierce College

CHEM

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Pre-Laboratory Assignment: Determining the Molar Mass of a Metal Name ____________________ Section _____________ Date _____________ 1. Prepare a data table in your bound notebook using the sample table as a guide. When you record the actual data, be sure to indicate the units of measurement. a. Do metals react with acids? If so, what products are most typically formed? b. Do all metals react with acids? How can you tell whether a reaction will occur? c. Give 3 examples of metals that do not react with acids. d. What about zinc, aluminum, and magnesium—do they react? 2. Write the balanced un-ionized equation and the net ionic equation for the reaction of each of the following metals with hydrochloric acid: zinc, aluminum, and magnesium. 3. The release of a gaseous product is a powerful driving force for a reaction. An additional driving force is to use an excess of one reactant to assure the reaction goes to completion. In this experiment which reactant should be used in excess? Justify your answer using complete sentences. (No calculations are necessary.) Experiment 4: Determining the Molar Mass of a Metal 57 4. Confirm your expectation in question 3 quantitatively by working a limiting reactant problem. Use the volume and molarity of HCl(aq) and the maximum mass suggested for zinc in Part II. Show all of your work. 5. a. The experimental procedure has you carefully measure the volume of hydrogen gas produced from the reaction of a given amount of metal. How does the measurement of the volume of a gas help you determine the molar mass of a metal? Answer this question by detailing the “road map” of calculations that will be necessary to reach the goal of this experiment. b. What properties, conditions, or values must you be sure to measure (in addition to the volume of the gas) if you are going to have the information you need for these calculations? Experiment 4: Determining the Molar Mass of a Metal 58
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Explanation & Answer

all questions are completely solved ,except for Q 4(as it requires Part II).Kindly provide part II ...i will solve the question

1. Prepare a data table in your bound notebook using the sample table as a guide. When you
record the actual data, be sure to indicate the units of measurement.
a. Do metals react with acids? If so, what products are most typically formed?
Yes, Metals reacts with acids, but not all. On reacting with acids,

M (s) + 2HCl (aq) → MCl2 (aq) + H 2 ( g )
In the above reaction, the hydrogen ion is oxidized in dihydrogen gas.
Reactive metals like magnesium zinc react with acids and they produce salt and hydrogen.
Liberation of hydrogen causes bubbling during the reaction.
Metal + aid➔Salt + hydrogen.
Mg(s)+2HCl(aq)➔ MgCl2(aq)+H2(g)
b. Do all metals react with acids? How can you tell whether a reaction will occur?
No, all metals do not react with the acids. Metals above the Hydrogen reactivity table react with
hydrogen whereas Metals below the hydrogen in reactivity table do not react with Hydrogen.
c. Give ...


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