Platinum Definition and 29 Threads

I wanted to make a simple platinum electrode with a few cm of wire. But it is hard to get. Local (Australia) science equipment suppliers are now citing platinum wire as a drug precursor. I can't see how anyone uses platinum wire or salts as a drug to get high. I am puzzled, in any case it...

I've been researching pem electrolyzers, but still don't understand how to mathematically express how platinum reduces the activation energy necessary to dissociate H2O. I've seen the Arrhenius equation solved before, but didn't understand how to get the values for it. Here are the operating...

The answer is [Xe] 4f14 5d8. Why does platinum (and other 6th and 7th period d-block elements) have 4f14 instead of 4f7? Thanks.

Hi, I found this question/s online and I was wondering if somebody was able to explain the answer given, specifically the first bit that says R1/(R1+R2) = R4/(R3+R4) (is this something to do with an equivalent resistor to replace the two in series on each side? But why are R1 and R4 the...

Basic Procedure The experiment basically involves finding the null point on the Carey Foster's bridge with the PRT as the unknown resistance and using a Resistance box as the variable resistance. In the above diagram, P and Q are 2 fixed resistors of equal resistances. For obtaining the first...

Is it possible that Kelvin and Platinum Temperature Scale give same reading of Temperature?

I plan on using a 1 ft long, 0.005" diameter platinum wire as part of an electrode. The wire will be bare but will be inside a hollow plastic tube that has an inner diameter of 0.08". It needs to be able to carry a maximum of 1 mA for a length of 10 minutes, while not exceeding 60oC. I'm not...

I have never understood the concept of the Wheatstone Bridge and how it works. Even the following equations and numericals on this topic of platinum resistance thermometer confuses me a lot... I need help.

In Standard Hydrogen Electrode why only Platinum electrode should be used and why should it be dipped in HCl?why can't we use any other metal dipped in any other acid other than HCl?

Why does platinum adsorbs hydrogen, when platinum being one of the inert element? Is there any law which states about the adsorbent and the adsorbent gas? Why do some elements like platinum absorbs while some elements doesn't adsorb gases!? Is there a way to predict that this element or compound...

Homework Statement Hello... Seems like an easy question, but I'm notquite sure though. Find the oxidation number of platinum in the following compound: Pt(NH3)2Cl(NO2)Homework Equations The Attempt at a Solution If I just put Pt = x, and I know that (NH3) is neutral = 0, and Cl = -1, the...

I'm trying to build a micro combuster, but i can't afford platinum. Anybody know of a catalyst that can allow for the combustion of gaseous hydrocarbons(methane, propane, etc.), in air, at atmospheric pressure, and at no more than 200 F?

Homework Statement Why is the electron configuration of neutral Platinum: Pt = [Xe]4f ^{14} 5d ^{9} 6s ^{1} and not?: Pt = [Xe]4f ^{14} 5d ^{10} 6s ^{0} I thought that if the two electrons from the 6s sub-shell were to move to the 5d sub-shell, then 5d sub-shell would be fully...

Hello all, The standard meter was said to be the distance between two scratches on a platinum iridium bar. http://en.wikipedia.org/wiki/Metre Where are these scratches? I only see the bar.

A platinum aperture from a transmission electron microscope exhibits atomic variations after prolonged exposure to electromagnetic radiation. A gold aperture on the other hand does not. Using a backscatter electron detector we can observe sturctural features of materials below the surface...

What is the reason of Persistent Glowness of Platinum metal after removing it from the flame ?

Homework Statement Homework Equations \Delta R/ R0 = \alpha \Delta T which goes down to : r-r0 /r0 = alpha (T-T0) r/r0 = alpha T +1 3. The attempt at the solution Hi there, I'm on a verge of mental breakdown. I have spent over 2 a4- sheets on figuring out how to get 't'. I...

why platinum is used in some half cells and not in others?

Homework Statement A Pt-resistance thermometer is used to measure temperatures in the range 0°C to 100°C. The electrical resistance of the thermometer is 2 Ω at 20°C and 6 Ω at 100°C. It is necessary to measure the temperature to an accuracy of ± 0.1 K. How accurately must the electrical...

of loose object in the center. This object is now surrounded by mass, will it hover exactly in the center of the hole, is there no gravity there ? If it is flexible, will it be expanded if it is expandable. How does one calculate this? (For realism, assume symetrical 2 meter channels from the...

Is there a way to determine how quickly gasoline or something else would burn at a specific temperature with a specific amount of platinum and oxygen present? Or at what temperature it will auto-ignite at with a certain amount of oxygen and platinum present?

I need to have it before Monday, so preferably a brick and mortar store. I live in the States.

Homework Statement Consider a platinum wire (σ = 1.0e+7) with a cross-sectional area of 1 mm^2 (similar to your connecting wires) and carrying 0.3 amperes of current, which is about what you get in a circuit with a round bulb and two batteries in series. Calculate the strength of the very...

Which is superior? Golden Rule: Treat other people the same way you wish to be treated. Platinum Rule: Make it better than it was before you got there, but not because you are waiting for return. In my opinion, the Golden Rule is passé. Doing something good for others so that they will do...

hi can someone help me with this?? briefly explain the characteristics of a pt100 platinum wire temperature sensing device.

Hi,i want somebody help me to get DVD or CD's for "Career academy" in CISSP Training Series Platinum Edition & CompTIA Linux+ 2005 Training &Cisco CCNP Training Suite with Cisco Wireless Training & CCNA Training - Cisco CCNA Certification at least anyone from the list.I want good torrent...

In an argon atmosphere, there is a pure platinum crucible that is used to heat Calcium Chloride salts to 850 deg C. After it is heated, pure chlorine gas is bubbled through the molten salt to remove CaO impurities. The heating method is by induction heating. My questions/concerns: Since we...

HI I have loops made of 85% platinum and 15% iridium. It brokes down after 3 or 4 steralization cycles (by getting red on Bunsen Burner) please advice reason and solution thanks

I have recently read that the platinum family transition elements (copper, gold, iridium, etc) have unusual properties when reduced to the monoatomic state. Basically, high spin leading to nucleonic deformity causing an extension of the shielding potential over the electron shells (valence...