Zinc Definition and 65 Threads

TL;DR Summary: Dry cells are usually not rechargeable but I had a few ideas. Basically dry cells are not rechargeable as zinc reacts with ammonia to form complex compounds which can't be revived. Consequently the quantity of reactants reduce thus hindering it from recharging. So in a dry cell...

It's all over the internet, the epidermis-deep explanation of radioluminescent zinc sulfide, "doped" or "activated" with copper (green) and/or silver (blue), being the phosphor that people mixed with radium salts (perhaps radium-doped barium or something with a bit more bulk for managability and...

Zinc chloride is Electrophilic and so acts as a Lewis acid.This characteristic is due to it's ability to accept electrons to it's 4 d orbital.My question is why it receives electrons to it's 4 d orbital when 4 p remain empty( according to Aufbau diagram)?Are there any other d block element...

Which alloy is better resistant to corrosion and less easy to get scratched and the paint fall? For kitchen cupboard handle. Thanks a lot.

A little background on my experiment … "Henna" (Lawsonia plant hair dye going way back to ancient times) used to be combined with metallic salts to cause it to adhere to the hair and make it thicker with cumulative use. In foreign countries "compound henna" is still being sold but often w/...

Hi, I'm in 12th grade and for my senior project I wanted to do an experiment on the effects that copper and zinc have on mung beans. I have copper sulfate pentahyde and zinc sulfate monohydrate, which I had purchased because I have seen information on other similar experiments where these were...

I'm looking for the least expensive method for making food grade zinc carbonate (for a molecular gastronomy recipe I'm developing). I know it can be done with the soluble forms of zinc (sulfate, chloride and possibly acetate) by combining them with sodium carbonate (which I have), but the...

I prepared zinc oxide nanoparticles by reacting zinc sulfate with sodium hydroxide and urea. Then, I centrifuged the reaction mixture to obtain the white powder and washed it with deionized water several times. I then mixed the powder with deionized water for UV-Vis. My results are a bit weird...

When I added a zinc plated iron ball into the acetone-peroxide solution, they zinc started bubbling. The solution turned whitish. Then after leaving overnight it became grayish with orange red foam on top

Hello, I have seen a video online that shows how a LED can be lit using a single lemon without using a copper and a zinc nail. They simply stick the LED into the lemon. What does that work? I know the lemon contains the electrolyte but don't we always need to dissimilar metals for the battery...

Hi I am stuck on the following question. Outline a plan of an experiment to determine the percentage of iron present as iron(III) in a solution containing Fe3+(aq) and Fe2+(aq) ions. You are provided with zinc, a standard solution of potassium dichromate(VI) and dilute sulphuric acid. Zinc can...

hi chemists, my chemistry is a bit rusty. i am doing some basic DIY zinc plating using a acid solution with some zinc sulfate in solution. basic recipe is like this: net 2L Epsom Salt 128 gram Zinc Sulfate 43 gram <-- use the ~99% pure stuff White Vinegar 85 ml Sugar 27 gram Tap Water 1915 ml...

Good day every one! Based on my research as you increased the temperature, the grain size become bigger and the thickness decreased, but in some paper, thickness increased. The effects of annealing temperature is almost the same to the temperature. But if you will considering doping for...

Homework Statement Zinc hydroxide has the chemical formula of Zn(OH)2. It has a very low solubility. What is the solubility in g/L of Zinc Hydroxide in a solution with a pH of 8? Homework Equations zinc hydroxide formula 14-pH = pOH[/B]The Attempt at a Solution 10^-6 (the pOH) gives me the...

Hi All, I'm searching for the possible method to determine organic coating thickness cover on steel tole was plated by thin zinc layer. Additionally, I also want to measure thickness zinc plating layer in between these layers (coating on top & steel on bottom) without destructing them. Please...

umm well that's about it

Homework Statement Zinc metal is added to hydrochloric acid to generate hydrogen gas and is collected over a liquid whose vapor pressure is the same as that of pure water at 20.0°C (18 torr). The volume of the mixture is 1.7 L, and its total pressure is 0.987 atm. Determine the number of moles...

Hi I am aware that Zinc Oxide (ZnO) is in the form of white powder. Can I leave a strip of Zinc in a room (at presence of Oxygen) so that it becomes oxidised therefore the same thing is resulted but in form of a metal strip instead of powder? Would the resulted strip become as oxidised as the...

Good day, many articles used sillicon wafer as substrate over others (like:platinum, glass, sapphire and etc) to grow Zinc oxide thin films, but I'm don't know the real reason they choose silicon wafer as substrate compare to others. so I'm asking what are the advantages of using Silicon wafers...

Hi , I am looking to coat the inside of a small nickel plated steel can (about the same size as an AA battery casing) with a conductive graphite layer that has enough density to prevent ZnCl2 (zinc chloride) reacting with the steel. The can is filled with some ZnCl2 and I am trying to prevent...

How dangerous are Zinc Oxide nano-particles to the skin? I'm sorry ahead of time if this is the wrong place to put this. I'm just curious if anyone here knows if nano-particles of zinc oxide sunscreen actually harms the skin? Would it speed up photoaging (considering that it is effective in...

what exactly ionizes zinc in the galvanic cell or the daniell cell ? i mean zinc atoms in the galvanic cell are ionized into Zn ++ and 2 e- . then the electrons move through the conductor to the copper bar , my question is why does zinc ionize when connected in a battery ? when the circuit...

Homework Statement Zinc has a density of 7.17 Mg/m^3. Calculate (a) the number of Zn atoms per cm^3, (b) the mass of a single Zn atom and (c) the atomic volume of Zn. Homework Equations atomic mass of zinc = 65.39 g/mol The Attempt at a Solution For part (a) I use the fact that...

Hello, I need some help with my research on zinc oxide. It is produced through melting of zinc and vapourization process. Now the question is how the surface area can be manipulated as per requirements or if possible can particle size also be manipulated ? thanks...

Homework Statement This is for a qualitative analysis lab. The unknown solution can contain any combination of the following ions: Na, Mg, Ni, Cr, Zn, Ag, Pb, NO3, Cl, I, SO4 Tools available: Bunsen burner for flame test, centrifuge, hot plate, and all the test tubes and DI water you...

I am just confuse about zinc oxide being a gas sensor. What I am implying is that why it can detect gases such as methane and C2H5OH? What are the properties of ZnO as a gas sensor?and what is the physics behind this gas detection?

I'm going to be giving a 1st year student chemistry tutoring so I'm going over some of his past exam papers to make sure I know all the stuff but I'm already at a question I can't do: http://img571.imageshack.us/img571/5716/26705030.png So from the formula, I can see that the degree of...

I need to derive the lattice parameter in terms of the Zn-S separation distance, l. I looked up the value and I've found it to be a = \frac{4}{\sqrt{3}}l The way that I started my derivation was saying that each tetrahedron has a sulfide ion in the center, so then we can make a triangle from...

as zinc is having completely field orbital sp2 ...why it is metal ? why it is having low melting point?

Which would you prefer? I'm calculating the amount of zinc absorbed by a particular plant (yes, in theory it does accumulate zinc- B.Juncea).

Homework Statement Powdered zinc is heated with sulfur to form zinc sulfide... however, part of the reactants react with O2 as well and form zinc oxide and sulfur dioxide... Imagine that 85.2 g of Zn reacted with 52.4 g of S8 and 105.4 g of ZnS was formed... If the remainder of the...

Homework Statement The activity coefficient of zinc in liquid brass is given (in joules) by the following equation for temperatures 1000-1500 K: RT ln γZn = -38,300 x2Cu where xCu is the mole fraction of copper. Calculate the partial pressure of pure zinc PZn over a solution of 60 mol%...

Wow. Can anyone please tell me how to approach this problem? For a science experiment you need to electroplate zinc onto both sides of a very thin, 1.00 1.00 copper sheet. You want the zinc thickness to be 140 , and you know that the charge carriers in the ionic solution are divalent...

Homework Statement I'm trying to determine the percentage of zinc in an unknown sample. What I did in this lab, was, I titrated the zinc solution (which contained about 4g unknown zinc sample) with Na2EDTA and it took about 20 mL to reach the end point. Before doing this, I standardized the...

Is Passivation to s/s = to Zinc Clear Coating of s/s? I know passivation is adding a layer of chorosion inhibtor the the surface so can this layer be clear zinc or are these different means of coating s/s?

Zinc reacts with sulfuric acid to produce zinc sulfate and hydrogen. But then, when electrowinning zinc, this is reversed, with zinc deposited on the cathode, oxygen evolved at the anode, and sulfuric acid also produced. So why does the sulfuric acid not immediately react with the zinc...

Surprised I only found a couple of messages about Zicam, the Zinc based "cold remedy". http://www.zicam.com/ The idea is that the zinc shortens the life of the cold virus. They don't make any claims like a "cure for the common cold".

Homework Statement Base metal zinc (Zn) reacts with concentrated hydrochloric acid (HCl) forming gaseous hydrogen and zinc chloride. STP conditions: pressure p = 101,3 kPa , temperature t = 0C. The equation of state for ideal gas: pV = nRT R = 8,314 J /(mol K) Homework Equations Write...

Zinc Alloy parts( Zn, with small % of Al, Cu,Pb, etc) become corroded with age. Refurbishing (Restoring) involves removal of all plating, drilling out corrosion pits and filling with zinc solder. Badly corroded parts have patches of oxided metal surrounding the pits. This substantially reduces...

Zn(II) ions form a white ppt. zinc hydroxide with an aqueous solution of ammonia. The white ppt. dissolves when a ammonium chloride solution is added to it. Which statement explains this observation? A. a soluble zinc chloride compound is formed B. ammonia molecule is a stronger ligand than...

Homework Statement 5.0 g of Zn is heated with an equal amount of S, bow much zinc sulfide is produced? Homework Equations The Attempt at a Solution Wouldn't there be an equation to solve this problem? I know law of constant composition is an observation that the elemental composition...

Homework Statement In my Chem lab we synthesized zinc iodide. To 1g granulated zinc, 2ml distilled water and 4 drops of 2 M acetic acid was added. Then 1g of iodide. The mixture was agitated and several minutes later the reaction completed. There was some excess zinc, so we set up a...

Zn---Zn+2 + 2e-

Hello. I am trying to activate crystals of Zinc Sulfide in order to get the crystal to glow in the dark. I do not need a long-term or powerful glow, I am merely investigating whether it is possible. How can I prepare Zinc Sulfide crystals that have copper impurities as part of the crystal...

The two commercial methods of reducing ZnO to Zn appear to be Thermal, in the presence of C: 2 ZnO + C → 2 Zn + CO2 and electrowinning: ZnO + H2SO4 → ZnSO4 + H2O (followed by electrolysis on the ZnSO4) But what is the effect of straight electrolysis on ZnO in the presence of some electrolyte to...

Homework Statement For a science experiment you need to electroplate a 130 nm thick zinc coating onto both sides of a very thin, 3.0 cm*3.0 cm copper sheet. You know that the charge carriers in the ionic solution are divalent (charge 2e) zinc ions. The density of zinc is 7140 kg/m^3 If the...

Hi, I have some Bright Zinc plated shelves which are currently being stored at 0-1'c. Over a period of 6 months they have become extremely rusty. How has this happened? Please help...

Homework Statement Brass is an alloy of copper and zinc. Varying the mass percentages of the two metals produces brasses with different properties. A brass called yellow zinc has high ductility and strength and is 34%-37% zinc by mass. (a) Find the mass range (in g) of copper in 185 g of...

Can zinc fingers be used to solve the oxidative DNA damage problem? theoretically? "By attaching zinc fingers which determine where transcription factors bind to endonuclease, which break DNA strands, homologous recombination can be induced to correct & replace defective/undesired DNA sequences"