AS Chemistry- helping each other out!

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Can someone help me with some half equations.

Like what is the method:

'When chlorine gas is bubbled into an aqueous solution of sulfur dioxide, hydrogen ions, sulphate ions and chlorine ions are formed'.

I) Write a half-equation for the formation of chloride ions from chlorine

Ii) write a half equation for the formation of hydrogen ions and sulfate ions from sulphur dioxide and water.

Ii) Hence deduce an overall equation for the reaction which occurs when chlorine is bubbled into aqueous sulfur dioxide.

I) write chlorine is diatomic so I was thinking Cl2+ 2e- --> 2Cl-?

Ii) not a clue can someone explain these to me thanks

Reply 1541

C0balt

Original post by HToo

sulfuric acid

Hazard is that sulfuric acid is corrosive so yeah

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Reply 1542

HToo

Original post by Windowswind123

Change in concentration/time?
What is it reacting with?

its a thermal decompostion process

Reply 1543

Windowswind123

Original post by HToo

its a thermal decompostion process

The concentration of the ZnCO3 will still change though?

Reply 1544

C0balt

Original post by HToo

its a thermal decompostion process

Didn't you just say it was reacting with sulfuric acid

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Reply 1545

HToo

Original post by Windowswind123

The concentration of the ZnCO3 will still change though?

yeah its meant to decrease

Reply 1546

HToo

Original post by C0balt

Didn't you just say it was reacting with sulfuric acid

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yeah im sorry my mistake, its with thermal decompostion :angelblush:

Reply 1547

Windowswind123

Original post by HToo

yeah its meant to decrease

So you could measure the change in concentration per unit time to measure the rate of reaction at regular intervals.
Or you could measure the increase in concentration of one of the products.

Reply 1548

HToo

Original post by Windowswind123

So you could measure the change in concentration per unit time to measure the rate of reaction at regular intervals.
Or you could measure the increase in concentration of one of the products.

ok thanks

Reply 1549

frozo123

Original post by Windowswind123

So you could measure the change in concentration per unit time to measure the rate of reaction at regular intervals.
Or you could measure the increase in concentration of one of the products.

ZnCO3 + H2SO4---> ZnSO4 + CO2 +H2O

You put a capillary tube on top of a conical flask which leads into a beaker on water with a measuring cylinder upside down in water and collect the amount of CO2 per unit time.
Then you draw a concentration against time graph and measure the half life to deduce the order of the reaction.

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Reply 1550

samb1234

Original post by HToo

ok thanks

For thermal decomposition of zinc carbonate the standard method is just a delivery tube from the test tube going into another test tube with limewater

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Reply 1551

C0balt

Original post by frozo123

You shouldn't use that method with CO2 because it is quite soluble in water.
You should use a gas syringe

Reply 1552

frozo123

Original post by C0balt

You shouldn't use that method with CO2 because it is quite soluble in water.
You should use a gas syringe

you should because you can write that as a limitation for the next question :wink:

Reply 1553

Heffalump .

What are the disadvantages and advantages of biofuels?

Reply 1554

samb1234

Original post by Heffalump .

What are the disadvantages and advantages of biofuels?

Pros: can be carbon neutral which can reduce co2 emissions and global warming, some biofuels will work with existing tech.

Cons: many use crops/land that would otherwise be used for human consumption that will push prices up for food, costs money and energy to build the processing plants, new engines in some cases etc etc.

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Reply 1555

nats927

Original post by Heffalump .

What are the disadvantages and advantages of biofuels?

advantages:
- carbon neutral - biofuels are made out of living things which took in co2 whilst they were growing so when you burn them youre just releasing this co2
- cheaper than fossil fuels
- renewable - plants can be planted again and again whereas fossil fuels eventually run out

disadvantages:
- food shortages- using farmland to grow biofuels means less farmland to grow crops
- produces lower energy