Can you give the advantages of alcohol as future fuels?

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Miss Michaela  Campion
Red, orange, yellow , green, blue, indigo and violet make up white. If you used red, orange, yellow, green, indigo, violet and white would it come out as blue?

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Miss Jierou Ho
Why experts sometimes have difficulty communicating the basis of their

judgments to novices?

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Amy-lou
Why is ice cold?

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Mr Yow Man
Can anyone please help with the following questions?

You are required to make a standard solution of Na2 CO3 (sodium carbonate). The number of moles required is 1.23 x 10-2 moles.

(a) Using the equation: number of moles = mass/molecular mass, determine the mass required (in grams) of Na2 CO3. [Hint: you need to look at the Periodic Table to get the atomic mass of each of the elements that make up sodium carbonate]. Your answer should be correct to 3 significant figures.

(b) Determine the molar concentration, assuming you will dissolve this mass of the compound in 250.0 ml of deionised water. Molar concentration is give by number of moles/ volume of deionised water used. Give your answer in mol/dm3 and correct to 3 significant figures [ hint you need to change ml to dm3 ]

You are required to show the use of negative indices in serial dilutions. That is, changing the molar concentration of your solution of sodium carbonate by diluting the solution in deionised water a number of times. Below shows the procedure you need to follow. In each step YOU MUST SHOW YOUR WORKINGS OUT AND IT MUST INCLUDE NEGATIVE INDICES CALCULATIONS.

The Procedure:

(c) After making the standard concentration, as (b), accurately take out 25.0 ml and place in a volumetric flask. Add 225.0 ml of deionised water up to the mark. What is the new concentration? [hint: to show the use of negative indices you need to link this solution with the original molar concentration in (b)]

(d) Now accurately take out 2.5 ml of the solution in (c) and place in a volumetric flask. Add 225.0 ml of deionised water up to the mark. What is the new concentration? [hint: to show the use of negative indices you need to link this solution with the original molar concentration in (b)]

(e) Now accurately take out 25 ml out of the solution in (d) and place in a volumetric flask. Add 225.0 ml of deionised water up to the mark. What is the new concentration? [hint: see above]

(f)Now you have completed (c) to (d), summarise the process, explaining how negative indices can be used in serial dilutions.

Thank you very much!

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Mr Yow Man
Explain Why The Elements C, N, O, Na, Mg, Cl, K, Ca, Fe Are Positioned Where They Are In The Periodic Table?

In each case explain in terms of their electronic configuration and using key features of the periodic table. Thank you.

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Miss Yellow River
Dear Sir/Madam,

If a house has many many glass windows and walls. In sunny day the room temperature will become very hot. If we cannot cover up the glasses and use Air-Conditioner. How to lower the room temperature?

Cordially Regards,

Ms. Yellow River.

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alanf
Why do convector heaters have grilles?

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Lord ramby adams
What is the amount of heat required to raise the temperature of one pound of water by 10 degree f?

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 Fahad Alfadhl
Why does hot water freezer faster than cold water in a freezer?

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 Fahad Alfadhl
Why is it difficult to open the fridge’s door soon after closing it?

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 Fahad Alfadhl
Is it true that we are less likely to catch cold in the cold?

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 Fahad Alfadhl
Why is human urine yellow?

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 Fahad Alfadhl
How does helium gas changes ones sound of voice?

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 Fahad Alfadhl
How many balloons are needed to lift a man?

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matt288
Why is the sky blue?

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Mr Plutonium Oxide
What is your favorite field in Science?

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Mr aman maroo
How do I trust my senses to give me the truth?

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Karen
I live in Arizona where the temperatures are high in the summer. My question is about our air conditioner. We have a programmable thermostat and leave it set at 85 degrees during the day. If I set it lower - say 80 degrees - will it run more often to hold the temperature? Or would it run the same at either setting?

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Anon
What is the optimum wavelength to knock off the oxygen from TiO2?

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Anon
What is the optimum wavelength to knock off the oxygen from TiO2?

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Mrs R Reisman
The full moon is 3 days long, which day is the 3rd day of the full moon for June and July 2008?

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scabby459
I beleive large clouds can weigh many hundreds of tons, so why does gravity not pull them to earth?

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what?
If you fall from a great height, which position should you try to land in so you dont get as hurt?

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kaymay
Branches of the facial nerve, what areas does the sensory branch innervate?

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Mr daniel eric
I am gay, if I married would my child also become gay does it depends on genes?

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Miss hannan obeed
The position of point A as a function of time t is given by > (1+2t,2-t)^T. give the equation(s) of the line on which A moves > (relation(s) between x,y,z for r=(x,y,z)^T on the line.

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joey
Did Einstein believe in God?

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ypk
A young man about to decide what to study - Sciences or Humanities - finally chooses Sciences. A Russian scientist, who does not know well the young man (apart from greeting each other) when he sees him and is informed of his choice, he states:"You have made the wrong choice. You are made for Humanities, you must study Humanities". How did he reach this conclusion?

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Mr Muhit Reza
A king in a country decided to kill all the educated men of his country. He found seven. He planned he will stand in a circle point and the seven men rounding him. He kill one man after two men. Now there was a scientist named Josephus in the country included in the seven men who knew a law to surviving him from the king. So what is his law or policy to survive?

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Mr Muhit Reza
From a near distance, if we look at a painted, little magnate bar and a painted, little iron bar, what is the difference we will find?

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yani
What is Perception?

Definition of perception?

Determinant of perception?

Types of perception?

laws of perception?

perception organization constructing our view of the world?

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Capolia
Is it possible that the recent mummies found in China are that of the lesser known ancient race Picts? There are suggestions that they travelled across the continents from today's Australia across the then joined land masses to Scotland, where many settled in an area called Pictland. Recent theories suggest that there were also Pictish settlements in the Canary Islands. Any ideas?

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Mr david danforth
What are the uses of lead chromate and its dangers and hazards?

What are its industrial uses and frictions?

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Mr david danforth
What is lead chromate?

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Sir al smith
Are screws stronger than nails?

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 fred bloggs
The contents of the small intestine are liquid but the feces are much more solid. Can you explain what causes this to happen?

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Miss christine jones
Why do we need to eat?

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nee
Are the chemicals used to make regular masking tape toxic? I need to use it occasionally, but have 9 small parrots, that I do not want to put in harms way. Thanks

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Mr mark ovenden
When I am emotional/upset I have a 'lump in the throat' sensation......how and why is this caused?

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doctor
To which part of the digestive system are proteins digested by enzymes?

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doctor
What family of chemicals does amylase belong to?

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jackthbean
How many cubic gallons of air does the average human breathe in an hour while sleeping? Assuming the the rate of breathing remained constant.

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Mr Juan Jesus Eneso
What's the difference between natural and derived products?

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 Michelle Denney
What molecule stores energy in large amounts?

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Miss alisha  sharma
To what family of chemicals does amylase belong to?

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Judi
What is an example of how punishment could be used to. What are the pros and cons of punishment ?

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Judi
How are punishment and extinction related?

What issues affect the use of punishment as a way to change behavior?

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Judi
How can higher order conditioning be used to influence human behavior?

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Judi
I need an example of how the principle of extinction can change human behavior and an explanation how spontaneous recovery could occur.

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