A friend showed me a little video of a light model made from wood. this model was in the shape of a triange with many more triangle inside of that. the wood was wrapped in alu-foil and above the alu-foil was a thin copper wire with a small electric current able to pass through it.

Hiya everyone,
Im having a little trouble understanding why the basicity of a heterocycle decreases as the heteroatom descends a group? I know that lone-pair/lone-pair repulsion decreases as the size of the heteroatom increases but was unsure why this caused a decrease in basicity. Is it something to do with the hydrogen atom replacing a lone pair and so decreasing the repulsion?

A 0.922 M solution of sulfuric acid (H2SO4) is to be reacted with a solution of sodium hydroxide to make sodium sulfate and water. 0.952 L of the H2SO4 solution reacts with 0.408 L of the NaOH solution. What is the molarity of the NaOH solution? Give your answer to 3 decimal places. Do I need to convert the L->G ? If so, how..?

Hi,

I am doing an assignment on flame photometry, and need to know the different flame colours for each of the metal salts (the experiment we are doing is to ascertain which salts are present by the colour of the flames). We are only able to test for sodium, which was yellow/orange, but I cannot find what the other salts and colours are anywhere.

Is there anyone who knows the colours, or where I can find them out.

Thank you in advance.

Dawn

I'm trying to write out the reaction mechanism for the formation of acid rain from atmospheric nitrogen. I know the general equations to go through but when it comes to showing the movement of electrons with 'curly arrows' I get stuck!

so, this is what I have so far:

1. O + N≡N → N=O + N

2. N + O=O → O + N=O

3. 2N=O + O=O → 2O=N=O

4. N=O + O=O=O → O=O + O=N=O

5. O=N=O + O-H → H=O=N=O
¦¦
O

Any help is appreciated!

hi guys
is there any way to remove the hydrogens in the mulucule below? if yes what would happen to the structure?

PCl5 (g) ---> PCl3 + Cl2

for the reaction above, delta H = +22.1 kilocalories per mole at 25 degrees celcius.

a. does the tendency of reactions to proceed to a state of minimum energy favor the formation of the products of this reaction? explain

b. does the tendency of reactions to proceed to a state of maximum entropy favor the formation of the products of the reaction? Explain

c. state whether an increase in temperature drives this reaction to the left, to the right, or has no effect.
Explain

d. State whether a decrease in volume of the system at constant temperature drives this reaction to the right, to the left, or has no effect.

I have been researching how to extinguish a fire with little or no residue and the ability to relight the fire later if desired. I came across a potassium dust solution, which appears to use aerosol to spray some kind of potassium dust solution onto a fire to extinguish it.

Does anyone have any thoughts or ideas on the best way to extinguish a wood fire that would leave little residue to clean up and allow the wood to be used later, if possible, to be relit?

I am having trouble figuring out a way to remove the H2C and CH3 from this molecule without disrupting the rest of the molecule. Can anyone help?

Hi there,

I have a 0.145 M solution of sulphuric acid. I would like to adjust the pH of my solution to 3 through the addition of 50% sodium hydroxide (caustic soda) in order to precipate my iron impurities. My knowledge of acid-base chemistry is extremely rusty. Can anyone help me in determining how much sodium hydroxide will be required to make this pH adjustment?