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Chemistry Feedback

by Ron Kurtus

Readers have sent in a total of 545 comments and questions on Chemistry issues. They are listed according to date.

You can read them to further your understanding of the subject.



List of next 15 letters

Title

Topic

Country

I want to understand chemistry General Nigeria
 
Will a micelle form in alcohol? Polar Molecules USA
 
Why is hydraulic jack known as a force multiplier? General Malawi
 
Wants to prepare a solution General India
 
What is concentration? General South Africa
 
What is an alkoxide? Chemical Compounds India
 
I do not understand the water equation Chemical Bonding Types UK
 
Questions on acids Acids Zambia
 
I want to see before I buy Polar Molecules Kenya
 
Why is Toluene a non-polar compound? Polar Molecules Canada
 
Why isn't H in front of C3H2 formula? Hydrocarbon Bonding USA
 
What does the first ionisation energy mean? Periodic Table Cameroon
 
Examples of polar and non polar molecules Polar Molecules Nigeria
 
Wants to apply material toward a degree General Somalia
 
Formula for a non-petroleum metalworking coolant Chemical Formulas USA
 

Next 15 letters

 




First 15 letters


General

I want to understand chemistry

April 29, 2013

Question

i want to understand chemistry very well

Sunday - Nigeria (23654)

Answer

Our lessons will give a you start at understanding chemistry. They will give the basics, so that you can understand more advanced studies.

Best wishes for success in learning about chemistry.

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Polar Molecules

Will a micelle form in alcohol?

March 27, 2013

Question

my problem is on micelle formation.
Will micelle form in alcohol due to soap
I think it would, as
water is polar and alcohol is also polar and micelle forms in water so it will also form in alcohol
But i also think it won't, as
alcohol is organic solvent whereas water inorganic,
and the soap dissolves in organic solvents and doesn't forms micelle

Please correct me if i am wrong anywhere and clear my doubt....

- USA (23564)

Answer

I don't believe that the micelle will form in alcohol, because of the low surface tension in alcohol and not the fact that alcohol is organic.

However, I am not that knowledgeable about micelle formation, so it would be good to check into some other sources.

Best wishes in solving your problem.

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General

Why is hydraulic jack known as a force multiplier?

February 21, 2013

Question

Why is hydraulic jack also known as force multiplier?

Joseph - Malawi (23217)

Answer

The input on the jack results in a larger output force.

A hydraulic jack is similar to a lever, except that is uses different diameter cylinders instead of lever moment arms. The resultant force on the large cylinder is the diameter of the large cylinder divided by the diameter of the small cylinder times the force on the small cylinder.

See Mechanical Advantage in Machines for more information.

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General

Wants to prepare a solution

February 10, 2013

Question

Sir i want prepare a solution of 10ppm from toluene and DMSO. TakeDMSO solvent.

Naresh - India (23193)

Answer

Sorry, I don't have that information.

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General

What is concentration?

January 27, 2013

Question

I want everything about concentration and the graph of concentration

Simon - South Africa (23153)

Answer

Concentration in a liquid is used in Chemistry. There are several types of concentration.

Mass concentration is the mass of the material in a volume of the mixture. There is also molar and volume concentration.

Graphing would depend on the materials and if they dissolve.

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Chemical Compounds

What is an alkoxide?

December 28, 2012

Question

what is alkoxide

Zeba - India (23083)

Answer

An alkoxide is a compound formed from alcohol by the replacement of the hydrogen of the hydroxyl group with a metal. The alcohol serves as an acid and hydrogen is produced as a by-product.

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Chemical Bonding Types

I do not understand the water equation

October 23, 2012

Question

I do not understand WATER chemical equation 2H2+O2 ===> 2H2+O2.
why 2 before H, when H2 is the molecule needed.
why O2 when only 1 single oxygen atom is need.
As water= h2o, nothing to do with 2H2+O2.

I am confuse.

Thank you for your time.

dorothe - UK (22995)

Answer

The expression for water is H2O. However, both hydrogen and oxygen exist as H2 and O2 molecules. If you combine one of each together, you will get H2 + O2 ==> H2O + O, which is impossible, since O cannot exist alone.

Thus, if you add 2 H2 + 1 O2, you will get 2H2O.

Count the number of atoms on each side of the equation: 2 H2 + O2 ==> 2 H2O. There are 4 H atoms and 2 O atoms.

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Acids

Questions on acids

October 13, 2012

Question

Question on acids.(chemistry).

Taurai - Zambia (22982)

Answer

See our Chemistry lesson on Acids for information.

Also see pH Scale for information on acid strength.

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Polar Molecules

I want to see before I buy

October 10, 2012

Question

Hi iam abdi i would like to see sample of what is there b4 i buy

Abdi - Kenya (22978)

Answer

I am sorry, but we are not selling products. However, some advertisers are offering products for sale.

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Polar Molecules

Why is Toluene a non-polar compound?

October 4, 2012

Question

Hello,

First of all, thanks for your website. Great job.

I have a quick question. I don't understand why Toluene is non-polar. If it would be a benzene then it would make sense to me because the C and H atoms would be distributed equally, but in Toluene there is a methyl (CH3) sticking out from one side of the Toluene molecule. Basically, it is not balanced anymore. How can this molecule be non-polar?

Please explain if you can. Thank you very much.

Tamer - Canada (22971)

Answer

The distribution of atoms in a molecule is a good approximation as to whether it is polar or non-polar, but it is not a hard-and-fast rule.

Some hydrocarbon compounds are polar and some are non-polar, according to their dielectric constant. Typically, hydrocarbon solvents with a dielectric constant over 5.0 are polar and those less than 5 are non-polar. Toluene has a dielectric constant of 2.38.

See: Dielectric Constant for a listing.

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Hydrocarbon Bonding

Why isn't H in front of C3H2 formula?

September 20, 2012

Question

why must the formular written like this C3H2 and not H before C LIKE
H2C3

FRANK - USA (22926)

Answer

For many compounds the elements are in alphabetical order. See Order of Elements in a Chemical Formula for details on how it works.

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Periodic Table

What does the first ionisation energy mean?

September 20, 2012

Question

hello sir, please clearly make me understand the meaning of first ionisation energy,second ionisation ebergy and third ionisation energy.....thanks...hope to get your reply as soon as possible....

fru - Cameroon (22929)

Answer

The first ionisation energy is the amount of energy required to strip the most loosely held outer electron from the atom.

A good explanation is seen at Ionisation Energy.

I hope that helps.

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Polar Molecules

Examples of polar and non polar molecules

August 13, 2012

Question

Can u explain a physical example on polar and non polar molecule?

Abraham - Nigeria (22839)

Answer

Often when the configuration of the molecule concentrates the electrons on one side of the molecule, it becomes a polar molecule.

A non-polar molecule usually is symmetric with respect to its electrons.

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General

Wants to apply material toward a degree

July 11, 2012

Question

can l study of the chemistry with free distance learning to fulfiling my degree education
please l hope you to accept thanks school champion

saed dariq - Somalia (22775)

Answer

Our lessons are meant to give people basic information on Chemistry and help to supplement an existing course. Unfortunately, we do not give credits that can apply to a degree.

It is difficult to find any free online distance learning that applies to a degree.

Best wishes for success in your studies.

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Chemical Formulas

Formula for a non-petroleum metalworking coolant

May 3, 2012

Question

I am looking for someone to help me came up with a formula for a non-petroleum water miscible metalworking coolant I have an MSDS on the stuff we are using write now if you can help great I know time is money I do not exspect this for free. David

David - USA (22631)

Answer

I really don't have any information on the subject. You might try:

Metalworking Lubricants, Coolants and Fluids Information or Chemetal Metalworking Fluids for information or leads.

Best wishes in finding your information.

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