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# Oxidation-Reduction and Electrochemistry

### What is the oxidation number?

What is the oxidation number of: P in P4 P in PO4 -3 C in CO3 -2 Cr in Cr2O2

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 Reaction: Oxidation and Reduction

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

### Measuring oxygen release from reduction

If I had a lab where I had hydrogen peroxide which is reduced in the presence of a catalyst to oxygen and water, how can I measure the amount of oxygen that would be released?

### 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

### Balance Chemical Reactions

Thanks for your response on the oxidation reduction it was helpful, but how do you balance 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+

### Balancing electrons: Oxidation-reduction method

Please help balance the electrons in the following formulas: Sn+HNO3-------.SnO2+NO2+H2O Sn---->SnO2 2H20+Sn-------->SnO2+4H+4e also, how do I balence this one Na+H2O----->NaOH+H2

### 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,

### Solving for Delta G

Can you explain what we are doing mathematically, canceling, multiplying etc.? Thank-you. I am trying to understand how to balance this equation. We were given the following data to solve for delta G (standard). S(s) + 3/2 O2(g)--------->SO3(g) delta G standard = -371kJ 2SO2(g)+ O2(g)--------->2SO3(g) delta

### 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

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

### Questions about oxidation number of a nitrogen containing molecule and oxidation-reduction of a metal ion

1) What is the oxidation number of nitrogen in N2O4 (dinitrogen tetraoxide? First, it has no charge; therefore N2 + 4(-2) = 0 N2 = 8, and thus N = +4. Is this right or wrong? Someone told me N = +2? 2) Nickel(II) nitrate is reduced to nickel metal in an oxidation-reduction reaction. Which is true? a Nickel ion gains

### Electrochemistry for Anodes and Cathodes

I am not sure if I have the right out come for this experiment for the following questions 1. Which one is the anode or the cathode? 2. What happens when the flame reaches the open end of the pipet. What property does this show about hydrogen gas? 3. What happens when turmeric indicator 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

### Finding Reagents

What are the reagents needed to form the specified product?

### 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

### Dehydrated Ethanol Reaction (Calculating Moles)

At intermediate concentrations of H2S04 in the temperature range 140-170 degrees C, ethanol may be dehydrated by two different independent reactions {see attachment}. Suppose that 30% of the ethanol reacts via reaction (1) and 70% via reaction (2). How many moles of water are produced per mole of original ethanol?

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]

### Complete and Balance Equations

1. Al2(CO3)3---> 2. Pb(Cr2O7)2 + Na3Po4 ---> Na2Cr2O7 + Pb3(PO4)4

### Drawing the Structures of Reactions

Draw the structures of the indicated products (see the attachment).

### Drawing Reactions

Draw the two indicated structures (see attachment).

### Electrochemistry - Half-reactions and overall cell process

I am trying to determine the separate half-reactions and overall cell process for the following and need some help: A miniature battery is composed of Zn and a paste of KOH, water, mercury (II) oxide, and mercury. Zinc and potassium hydroxide are consumed, mercury is deposited, and potassium zincate is formed. Also, wha

### Chemistry Problem Set - Eknot, Gknot, and Oxidizing Agent

2. Find Eknot fora cell composed of silver and gold electrodes in 1 molar solutions of their respective ions: Eknot red Ag = .7991 volts, Eknot red Au = 1.68 volts a -.44 volts b 0 volts c .44 volts d .88 volts 5 A Zn|Zn2+||Cu2-|Cu cell has an Eknot of 1V. Calculate Gknot for the reaction (in kJ) b -193 c 1 d 1

### Chemical Reactions with Aluminum Foil

We had a lab using Cu(II) Chloride dihydrate, water and Aluminum foil. we put the Cu(II) in water, stirred and then crumpled the foil and dropped in solution. We are supposed to describe any additional experiment we would do to prove our hypothesis. (The aluminum pulled the copper solids out of the solution and the aluminum d

### Calculating Oxidation Numbers and Density of Inorganic Compounds

Calculate the Z (oxidation number) and densities of the following two compounds: 1) K2O (regular tpe) and 2) K2O with K filling all retrahedral sites of hcp O (assuming idea c/a ration).

### Ion selective electrode problem

The data below is obtained with a potassium ISE. To avoid interferences from H+ and variations in ionic strength all solutions were made to contain 0.33 M Ca(NO3)2 and 0.0010 M NaOH. An unknown solution was similarly prepared and gave a reading of -0.0273 volts. a) What is the slope of the ISE response? (This is the same a