Primarygun

Rusting of iron is the corrosion of iron by both water and oxygen so that it becomes hydrated iron(III) oxide. Oxide layer of iron is not impermeable to water

Besides Kirchhoff's law, which laws are still important to elementary circuit? The law is not required to learn for me, but I'd like to learn more though. I could figure it out the solution by considering the right part only first.(cover the left part) Find the equivalent resistance, then open the left part, a // circuit. Find the current in the main branch. Since ammeter has no resistance, all currents are drawn to it. so that's the answer, right? Although I may find out the solution later with the powerful law suggested by you guys, but I'm afraid I still won't know the solution to my own questions. May you please tell me ? 1. Can a current flow through in this sequence, DABE can CBAE? If yes, then the two currents meet in the branch AB with opposite direction. Will a problem arise? 2. Can a current pass through a particular junction two times? Thanks.

yes. High temperature and expensive catalyst is involved. By the way, I am thinking of oxidizing sulphite ion into sulphate ion with H+ given out by bubbling oxygen into it. Is this possible to make a dilute sulphuric acid?

Can you give us some examples which you are quite confused with? Here, not everyone has the experience of facing difficult questions during their elementary lessons.

Please have a look at the photo below. Thanks Referring to the figure, I tried to find out the current flowing in AB so as to solve it. However, I was not able to finish it as planned. Can anyone give a brief note on the solution? Moreover, I have some questions in my mind. 1. Can a current flow through in this sequence, DABE can CBAE? If yes, then the two currents meet in the branch AB with opposite direction. Will a problem arise? 2. Can a current pass through a particular junction two times? Thanks. [Edit] Important: Please neglect the question in the photo. Here is the question: Find the reading of the ammeter in terms of E(Emf/V) and R

The result is extremely exothermic, according to my book. In this connection, we would use very concentrated sulphuric acid to trap the gas forming fuming sulphuric acid and add little water to get concentrated concentrated sulphuric acid again. The result for adding sulphur dioxide into con. sulphuric acid is H2S2O7? I don't know it , is it true? The con. sulphuric acid oxidizes the sulphur dioxide? is it the answer? If yes, will sulphur dioxide more likely change into sulphate ion or sulphur trioxide?

Can we say that in another way?Carbonate combines with one H+ to hydrogencarbonate. Why don't we use this perception?

A quite useful link for manufacturing HCl. Neither too long nor boring. Have a look at the pdf when you are interested. http://64.233.167.104/search?q=cache:gOS72SLd2n0J:www.epa.gov/ttn/chief/ap42/ch08/final/c08s06.pdf+manufacture+of+hydrochloric+acid&hl=en

Or a faster method, 0.8x148.16 g:0.2x60.062 g will be the ratio of each compound in the 0.5 g

I think I know what you mean . For every amount of the mixture, we have the ratio given/required. Let's handle one mole first, Mole of cinnamic acid :mole of urea acid=4:1 so, in a mixture of 1 mole of urea acid, the mass=(148.16 x 4 g+60.062 g )=653g When 0.5g is divided by it, we get the no. of mole of urea required. Then you can finish it yourself/

What are the products from the electrolysis of molten lead(II) nitrate? It seems to me that it's rather difficult for nitrogen atom to lose another electron from its first electron shell again, but what's supposed to be the product? Moreover, what will be the product from electrolysis of molten lead)II) sulphate?

I know what the fact is, thank you. So we get a measure of the velocity of the electrons after they pass through the bulb before getting the conclusion of they lose electric potential instead of velocity , or something else? so is having high resistance is necessary for a proper voltmeter?

Here are two questions concerning the circuit things. 1.In a series circuit with a bulb in the middle of it with 5V. (Please neglect resistance of wire) My teacher said that each electronwould lose all of the energy, i.e.5J per second, after they have passed the bulb. So it has a decline in its velocity after passing the bulb? 2.In the circuit above, a voltmeter is connected. The voltmeter starts a new loop for the circuit, so the energy given by each electron to the bulb will change and then how does a voltmeter work? Thanks for any replies.

I downloaded WM recorder 10.2 and it accomplished it. I launched the software (not WM)for the internet TV channel, then entered the URL on it. It recorded the programmes. Is there any other software having a similar function?

There's a online TV firm in my country providing online TV programs for us to watch. The programmes are instantaneous, live. I downloaded the software and the Window media player was used to enjoy this free service. I want to get some of my favourable movie recorded in the channel but I don't know what to do. There might be some software which kindly provides the powerful function but I have very little knowledge about it. Any idea would be appreciated.

I wanna ensure something in my mind. In practice, the reaction between the two substance is a neutralization. And it is that this process make the decomposition of ammonium ion into ammonia become more favourable,the neutralization process indirectly produce more gas, right?

I think your brother is correct

Rarely had I heard it when this question appeared. I searched the google for it. So far, I only know that it is soluble in water.

Silver hypochlorite is soluble in water. Again, no idea about what the colour of the solid is.

The SARS virus speeds up our defencing system if I remember it correctly. Really threaten the Asian

What should I use to seal around the doorway? A dense particle-board, or some polystyrene? The space around doorway is the main focus contributing to the problem

Where should I put? To thicken the door? Would you explain some physics involved?

What's the difference between Autonomic Nervous System and exocrine system? The latter secrets hormone but the former doesn't stimulate it?

We boil hard water to favour the reaction by driving out carbon dioxide, right? What does hard water exactly mean?