I need help getting the chemical equations from 3a and 3b. 25-4 Faciors Affectin

Question

I need help getting the chemical equations from 3a and 3b.

25-4 Faciors Affecting the Rates of Chemical Reactions test tube containing the metals. What other product is formed besides a gas? Write chemical equations describing the reactions of the metals with water. SAFETY PRECAUTIONS: 4 of this experiment involves Is there a correlation of the reaction rates with the lonization potentials of these metals (is it easler to remove electrons from magnesium or calcium)? igniting small quantities of flammable solve is no more hazardous than lighting a Bunsen burner. It is recommended that the flammable solvents be kept in the fume hood and that the requisite amounts be dispensed to you there. There must be no open fames in the hood where the solvents are stored. After obtaining your small amounts of solvent, you should take them to the lab bench where the experiment is to be carried out. The containers of flammable solvents must never be taken to the lab bench. If a fume hood is not available, the instructor should demonstrate the experiments in parts 4b and 4c. nts. If you follow the directions, this 3. The Influence of Surface Area in a Heteroge- neous (a) Set up the apparatus shown in Figure 25-1 using a 125-mL Erlenmeyer flask, a 13 × 100 mm test tube to collect the gas, and a large beaker or plastic basin. Fill the test tube with tap water and holding your thumb or finger over the mouth, invert it in the beaker of water over the end of the bent gas delivery tube. Place 3 g of coarse marble chips (CaCO3) in the 125-mL Erlenmeyer flask. Add 25 mL of water, then add 25 mL of 1 M HCI Immediately insert the one hole stopper in the flask and record the time required to fill the test tube with gas. What gas is produced? Rinse the Erlenmeyer flask with tap water and place the used marble chips in the waste recepta cle provided. Do not discard the marble chips irn the sink. Obtain another 3 g of marble chips and using a mortar and pestle, pulverize them to the size of grains of sugar. Using a rolled up sheet of paper as a funnel, transfer the granular material to the 125 mL Erlenmeyer flask. Fill a test tube with water and invert it over the delivery tube as before. Add 25 mL of water to the flask, followed by 25 mL of 1 M HCI, and stopper immediately Record the time required to fill the test tube with gas, Save this apparatus for use in part 4. Is there a correlation between the surface area of the mar ble and the reaction rate? Write an equation describing the chemical reaction between CaCO3 I. Effects of Concentration on Reaction Rates Place 5 mL of solution A in a 50 mL beaker. Add S mL of 3% H202, mix, and note the number of seconds required for the solution to turn blue. Record the reaction time Repeat the procedure using 5 mL of solution A, 4 mL of water, and 1 mL of 3% H2O2. Record the reac tion time. Is it longer? Which reactant concentrations have been changed? What is the relationship between the reaction time and the initial concentration of 2. The Influence of the Nature of the Reactants Obtain three or four small pieces of magnesium metal turnings and about the same amount of cal cium metal turnings, Add enough water to each of two 15 x 150 mm test tubes to fill them about one third full, Place the magnesium turnings in one test tube and the calcium turnings in the other. Both of these metals are in the same chemical family in the periodic table. Which metal is more reactive with (b) Place a small iron nail (cleaned so that it is free of rust) in a 20 mm diameter test tube, In a second 20 mm test tube, place a 0.6g ball of steel wool, using a glass rod to push it to the bot tom of the test tube. Add 10 mL of 1 M CuCl2 to each test tube and watch them closely, Observe and record any color changes and note in which tube they occur more rapidly, Is a new solid sub stance forming? What do you think it is? Agitate each test tube and feel the lower portion of the tubes, Is one tube warmer than the other? What happened to the steel wool? Would the same thing eventually happen to the nail? Write an equation describing the chemical reaction that To determine what gas is produced, invert an empty test tube for about 15-30 s over the mouth of the tube in which the metal is reacting more vigor ously, Quickly move the mouth of the inverted tube near the flame of a Bunsen burner. Is the gas flamma ble? What is the chemical composition of the gas? Look closely at the slower reacting metal as you agitate the test tube. Is any gas being produced? Add a drop of phenolphthalein indicator solution to each

Explanation / Answer

3a

CaCO3 is acting as a base,

will be reacted with HCl in order to form + salt CO2 + water:

CaCO3(s) + HCl(aq) = CaCl2(aq) + CO2(g) + H2O(l)

balnace

CaCO3(s) + 2HCl(aq) = CaCl2(aq) + CO2(g) + H2O(l)

3b

now..

small iron nail = Fe(s)

CuCl2(aq)

this will be redox

Recall that Copper is much more stable, so Cu2+ solution will form Cu(s) and vice verse

CuCl2(aq) + Fe(s) --> FeCl2(aq) + Cu(s)

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