Share
Explore BrainMass

Oxidation-Reduction and Electrochemistry

Cell Potential and Reduction Potentials

Hi. Can someone please explain to me how to do the following question? I'm quite confused about how to do these. See attachment for better notation representation. Consider the following reaction at 25 degrees C, [Al3+] = 2.0 M and [Zn2+] = 1.0M 2 Al (s) + 3 Zn2+ (aq) -> 3 Zn (s) + 2 Al3+ (aq) a) Predict if the cell po

Exchange Current Density of Metal Ions

The following data were obtained for the reduction of metal ions A+ to metal A in a stirred solution at a 0.1 cm^2 electrode; the solution contained 0.01M A+. n(mV) -100 -120,-150, -180, -220, -280, -370, -500, -600 i(uA) -45.9, -62.6, -100, -170, -300, -510, -770, -965, -965 Calculate the exchange current density jo[uA/

Mendeleev and the periodic table

1. Why did Mendeleev leave three blank spaces in his periodic table? 2. Why do elements in a group of the periodic table have similar properties? 3. List five different metals give examples of how each metal is used. 4. List five different nonmetals. Give examples of how each nonmetal is used. 5. Why would you expect to find

Oxidation of Alcohols

What kind of product might result from the oxidation of the following (ethanol, 2-propanol, 2-methyl-2-propanol) an aldehyde or a ketone? Which reactions might occur with difficulty? Which reactions might not occur at all? What would each of their temperatures, color, odor, and reaction rates be? NOTE: In the

Oxidation States of Iron and Color Differences

Both normal oxidation states of iron, Fe, will form low spin complex ions with cyanide (CN-); i.e., [Fe(CN)6]4 minus (aq) and [Fe(CN)6] 3 minus(aq). However the color of these ions is not the same. One ion is green-yellow (more yellow than green), which means it absorbs violet to blue light and the other is blood red in color,

An unknown is either 2-methyl-2-propanol or 2 methyl-1-propanol. Addition of a few drops of dichromate solutions (orange as a strong oxidizing agent) to the unknown results in a green solutions (the color after it has been reduced).

An unknown is either 2-methyl-2-propanol or 2 methyl-1-propanol. Addition of a few drops of dichromate solutions (orange as a strong oxidizing agent) to the unknown results in a green solutions (the color after it has been reduced). What is the identity of the unknown? Explain.

Oxidation of Limonene

Limonene, C10H16, a terpene found in citrus peel, absorbs only two moles of hydrogen forming p-menthane C10H20. Oxidation by permanganate converts limonene into structure A in the attached .jpg (ignore structures B and C for this problem). 1. How many rings, if any, are in limonene? 2. What structures are consistent wit

pH at 25 degrees Celsius

A hydrogen electrode (PH2 = 1.00 atm), a salt bridge, and a calomel electrode (E=0.280 V) are used to determine the pH of a solution. If the combination (i.e. a solution, the hydrogen electrode and the calomel electrode) gives a voltage of 0.790 V, what is the pH of the solution at 25 degrees Celsius?

Carbon Disulfide, CS2

Carbon Disulfide, CS2, is an important industrial substance. Its fumes can burn explosively in air to form sulfer dioxide and carbon dioxide. CF2(g) + O2(g) (arrow) SO2(g) + CO2(g) If 1.60 mol of CS2 burns with 5.60 mol of O2, how many mols of the excess reactant will still be present when the reaction is over.? Also .

Question about Oxidation Reduction

Break the following reactions into their half reactions. Label what is being oxidized and what is being reduced and by what number of e- P4 + 5O2 --> P4O10

Half reactions

Break the following reaction into its half reaction, label what is being oxidized and what is being reduced. I don't have any idea where to even begin! Fe2O3 + 3CO ---> 2 Fe+ 3Co2

Ice Cream Experiment

This experiment will introduce the concept of homogeneous, heterogeneous, mixtures, solutions, and the colligative property of freezing point. Materials 2 sandwich zip lock bags 2 one-gallon zip lock bags Thermometer 1 cup half-half or 2% milk 2 Tbs. (tablespoons) sugar 1/8 tsp. (teaspoon) flavoring {Choose from: v

Oxidation Number Method

How do you balance this equation using the oxidation number method only? ClO4)-1 +Al+H)+1---->Cl-1 +Al+3 +H2O Also, How many mole of Fe2+ react with each mole of cr2O7)-2 when properly balanced 6? Cr2O7)2- + H+ +Fe2+ ---->Fe3+ Cr3+ +H2O

Balence reactions

OTA ID 104923 Thanks for your response on the oxidation reduction it was helpful, but how do you balence equations without oxygen? such as Cu2+Fe------->Cu+Fe2 I started out with Cu2-->Cu Cu2+---2Cu and on the oxidation side Fe-->Fe2+ Fe-->Fe2+2e and what about this one? Sn2+2Fe)3+----Sn)4+ 2Fe)2+

Amount of energy required to purify copper using electrolysis?

The purification of copper by electrolysis involves an anode of impure copper and a cathode of pure copper. During the electrolysis, copper (II) ions leave the anode slab and plate onto the cathode slab. The reaction at the anode is Cu(s) = Cu2+(aq) +2e- The reaction at the cathode is Cu2+(aq) + 2e- = Cu(s) Therefore,

Electrochemistry, redox reactions, and inorganic chemistry

4. A practical application problem which I have recently encountered: Recently while a stainless steel reactor vessel was being polished, a problem occurred with the workers' environment. While monitoring atmospheric composition while working in the vessel, high levels of carbon monoxide (above 100 parts per million) were det

Oxidation States of Elements and Ideal Gases

1. Identify oxidation states of all elements. 3Ag(s) + 4HNOsub3(aq)->3AgNOsub3(aq)+NO(g)+2H2O(l) I have everything except I thought O = -6 but it's wrong. Why? 2a)A 6.35L sample of gas is collected at 55degreeC and 0.892 atm. What volume of the occupy at 1.05 atm and 20.0degree C. PV=nRT (.892)(6.35)=n(o.o821)(55+2

Electrochemistry

I am not sure if I have the right out come for this expeirment for the following questions 1. Which one is the anode or the cathode? 2. What happens when the flalme reaches the open end of the pipet. What property does this show about hydrogen gas? 3. What happens when turmeric indictor is added and connected to the power.

Molecular Structure -Lewis Diagrams

1. Write Lewis electron dot structures for (a) GeCI3-, (b) FC02- (c) CO32-, (d) AICI4-, and (e) FNO. Where more than one resonance structure is important, give examples of all major contributors. 2. Construct Lewis structures of typical resonance contributions of (a) ONC- and (b) NCO- and assign formal charges to each atom. W

Solving for Oxidation

Hi, I need assistance with the following two questions: 1)Determine the oxidation numbers for all elements in the reaction below: 6NaOH(aq) + 2Al(s) ----> 3Hsub2(g) + 2Nasub3AlOsub3(aq) b) Given 2.0g of solid Al in a cleaner, how much hydrogen gas will be produced? 2) Write the balanced molecular equation, complete

Compound Formula

Write the formula for these compounds: a) potassium sulfide b) iodine heptafluride c) iron(III)chromate

Determining limiting reagent

Given a solution containing 3.75 grams of PbCl2, you add enough Ru(OH)5 powder to completely use all of the PbCl2. What is the limiting reagent? 1) Complete and balance the reaction. Identify the state of each substance. 2) Identify the type of reaction. 3) Correctly name each reactant and each product. 4) Show the c

Question About Electrolysis

By the electrolysis of water, 11.2L of oxygen at STP was prepared. a) What charge was required? b) If a current of 0.5A was used, how long would it take?

Complex Naming

Name the following complexes: [Rh(en)3]Cl3 cis-[Mo(CO)4Br2]