Primarygun

Why do water molecules cannot attract and seperate the phosphorus trichloride? It's polar molecule, attraction is quite strong.....

mercury(II) sulphide + oxygen -----> mercury + sulphur dioxide DO IT IN A FUME CUPBOARD! Heat is needed. By the way, why lead(II) sulphide react with oxygen to give lead(II) oxide and sulphur dioxide but not pure lead(II)? Reactivity? and the stronger metallic bonding?

I am not certain about the physical meaning in the osmosis. I am quite confused with the word water potential .

If the tube is connected to a dialysis tubing, the water level drops. I am not sure whether the level of final level is equal to the level of the sugar solution. But I am sure that the water potentials of both positions are the same.

What's BBC?

It is true. Citizen indirectly increase the rate of G.W. Carbon dioxide released from burning coal, the greenhouse gases and waste gases from vehicles are the sources of greenhouse gases in the troposphere.

What will happen to the liquid level in the capillary tube if distilled water is put in the tubing and sucrose solution is put in the beaker?

Why don't you take some ideas from the organic chemistry? I think it has plenty of things related to kitchen and is quite suitable for your project. Ya, I also think if you want to have an extraordinary project which is much different from your classmates, you may search the web for information.

Which of the following is the least important for plant and oragnism? Osmosis, diffusion , active transport.

How to speak english well? Where should I take the voice up and where I take it down?

Which bond of the above in a particular formula unit or molecule is stronger? Personally, I think covalent bond is stronger. Many ionic substance dissolve in water to give ions out but no molecules, like oxygen , hydrogen....

I have to do the same project but with unlimited equipment and unstricted methods!

Is there something to enchance the rate of oxygen gas into aqueous solution by the cell?

I think when potassium metal is put into a hydrogen peroxide solution is more dangerous than puting in HCl, right? The energy released more? Or just the energy released within a period of time is high?

I forgot to tell you, in molten state , there are mobile ions too:P

How do carbon dioxide and oxygen diffuse into a leaf? My book said that they first dissolve into a layer of water then diffuses into the cell membrane. Why don't they just move into the cell ? And is active transport only for those molecules which can pass through the cell membrane?

Ammonium ion and hydroxide ion exist as pure ion when they are in solution which doesn't react with the compound and bare a moderate attractive forces to pull out the ion alone. Like sodium ion and chloride ion are example when sodium chloride dissolves in aqueous solution, such as water. Actually, formation and activity of molecule can be explained by quantum mechanics. So far, I haven't learnt that yet. I was greedy and read a few page. There was a sentence I always memorize is " the quantum mechanics is the study of the probability of chance of collision" I think it may be useful now

It has a probability. However, bonded to form and to be stable to form is two different things. I think the molecule is not very stable since it the central atom , nitrogen atom, need to spare a position for one lone electron and four pair electrons. I have no longer knowledge on the stability. Therefore, I may be wrong.

The thread has been viewed over 10000 times!

For what reason, the induction only can be used to prove natural numbers n(but not negative numbers?)? How to guess the formula of a sum of a sequence of number?

Which core persons firstly talk in this forum?

We love truth.

I went sightseeing in a university. I went to the mechanical and engineering department. The day was an open day of the university , so there are some professors greet people and they show some particular small experiment or theory to us! I think I probably got into the mechanical and material engineering. They show some materials, aluminium, and an alloy of aluminium and copper. The professor told me that the alloy was very strong and is used for making aircraft. No one use a pure aluminium metal. He told me that it is strong because the copper added increased the resistance. The model of the alloy metal slides too but not for the whole row. Ya. That moment, I knew about the resistance not only in electricity but also in the strength. He used a term' line' to describe the boundary. Is anyone free to explain further? Then he brought us to another room. He used immersed one iron metal into liquid nitrogen. Do you know the purpose? The iron is very cold. Then he use some equipment to measure the energy required to break this iron and another iron not immersed.(The central of both iron metals have a small valley) I know you must know the result The professor spilt the container and the liquid nitrogen was spilt. The spread was so fast. What I saw was, the colourless liquid touches the floor and evaporate very fast. The metal cover stained with some liquid. The surface turned into ice! The process was very smooth, I was very excited to have an experience on this dangerous chemical! The circumstance like a scenery in the " The Day after tomorrow". The scenery of the US flag turns into ice and the temperature of the surroundings drop at a rate of 10 Celsius degree. So you know how excited I was! Luckily, no one was hurt. Something more is the professor is an indian, I think(Since some of the english he spoke liked an indian and I couldn't hear clearly.My english is not very good so I am not sure).BUT PULLKIT , BE CAREFUL OF HANDLING CHEMICALS!Third, we moved into a room. He put two long steel into a hot furnace. Then he put one of it into water and the other was left to cool down in air. He pointed a girl to break the steels. Could anyone predict the result and explain it ? I am not very sure in the explanation.(He didn't explain ) Then, I went to the fluid visualisation mechanics. A car with shelter in a box. Something I want to consult is, whether the car behind a car need to spend more energy to run or spend less energy. The day spent there last me over 5 hours. Maybe I would share them later! I put my thread here because I think I need someone's help.

I know everyone very little Bike, I thought you work with a job now

Zinc will be all used up in sixty more years. Be Quick !