[cuongt]

I need some help and feedback on my answers and questions.

1. Chlorine is used to treat water to make it safe for drinking. The reaction of chlorine with water is: Cl2+ H2O<----> HCl+ HOCl.
State and explain the effect on the safety for drinking if the pH of water is decreased.
I wrote:   
as the pH of the water is decreased the water becomes less safer i.e. more acidic. Is that right and if it is what else can I right I need to write like 3 points.

2. State one undesirable effect of the ozone in photochemical smog.
I wrote:
Ozone would make leaves go yellow.

3. State and explain the effect of increased light intensity on rate of ozone production.
I wrote:
Increased light intensity on the rate of ozone production will increase its speed of production. I can’t seem to find anything else to write.

4. Describe, with the aid of equations, how the use of motor vehicles lead to the formation of nitrogen dioxide.
I wrote:
N2+O2----> 2NO
2NO + O2 ---> 2NO2
Motor vehicles release N2 into the air, which reacts with O2 forming nitric oxide. Then the nitric oxide further reacts with more O2 to form NO2 (nitrogen dioxide).
“I got no marks out of 4 for this explanation” can you explain to me if it is wrong or not. And if it is what the write answer would be.


Thanks a lot  

[Borek]

Motor vehicles release N2 into the air

This one is obviously wrong, as the N₂ doesn't need to be released - it is already there, N₂ constitutes almost 80% of the air. The thing is, its reaction with oxygen doesn't go in low temperatures. Conditions inside the cylinders during fuel combustion allow some nitrogen oxidation.

[cuongt]

thanks a lot.  
do u know what equations there will be?

[green-goblin]

3. State and explain the effect of increased light intensity on rate of ozone production.
I wrote:
Increased light intensity on the rate of ozone production will increase its speed of production. I can’t seem to find anything else to write.

Uv light also splits up CFC's into radicals which then destroys ozone so couldn't increased light intensit could also have a negative effect in cartain areas?

[cuongt]

i dont undeerstand what ure trying 2 say  

[green-goblin]

The answer you said is corect  and most likely the main answer they are loking for. UV light does make ozone by splitting O2, and a O radical then binds to another O2 molecule. so a higher intensity will give a higher production.

Just in areas with high cfcs this effect could be negative?  Just gives you something else to right.

[cuongt]

oooooo i understand now what u were trying to rite thanks a lot man.


cheers