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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 need Chemistry notes General South Africa
 
What is oxidation reduction process General Philippines
 
List decreasing order of polar solvents Polar Molecules India
 
Can we get hydrogen from air? Uses for Hydrogen India
 
What is a simple strategy to understand chemistry? General South Africa
 
How does oxygen dissolve in water? Polar Molecules Australia
 
I though helium caused balloon to float Uses for Hydrogen Australia
 
Meanings of acide prefixes Acids Nigeria
 
Significance of acid prefixes Acids Nigeria
 
Empirical formula of a chemical compound General Zambia
 
Explain everything General South Africa
 
What is an acidic salt, basic salt and neutral salt? Salts Pakistan
 
Need details on hyrdocarbon bonding Hydrocarbon Bonding UAE
 
Why are Alkynes non-polar molecules? Polar Molecules South Africa
 
Are chloroform and ethanol polar or non-polar? Polar Molecules Bangladesh
 

Next 15 letters

 




First 15 letters


General

I need Chemistry notes

September 20, 2013

Question

i need some notes of chemistry

Siyabonga - South Africa (24033)

Answer

You can read our lessons on Chemistry. Also check the Resources. This should help your understanding of the subject.

Best wishes for good grades.

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General

What is oxidation reduction process

September 20, 2013

Question

can you answer me what is oxidation reduction process????

xiander - Philippines (24035)

Answer

The oxidation-reduction process is used in chemistry. Oxidation is adding oxygen to form an oxide. Reduction is removing oxygen from a compound. They always occur together.

A simple example is the burning of hydrogen to form water. Hydrogen is oxidized, while the oxygen molecule loses an oxygen atom to the hydrogen.

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Polar Molecules

List decreasing order of polar solvents

September 3, 2013

Question

decreasing order of polar solvents.

anu - India (23987)

Answer

See Polarity Index for a list of polar solvents in increasing order.

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Uses for Hydrogen

Can we get hydrogen from air?

August 25, 2013

Question

How can we take original hydogen from air?

Manpreet - India (23965)

Answer

There is a very small amount of hydrogen in the atmosphere, and it is difficult to isolate. Instead, water (H20) is broken down by electrolysis to separate out the hydrogen. Water vapor from the air or from rain could be collected for this purpose.

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General

What is a simple strategy to understand chemistry?

August 24, 2013

Question

what is the simple strategy of how to understand chemistry

SAMSON - South Africa (23961)

Answer

Chemistry concerns how atoms of different elements combine to form molecules. It is all based on how many electrons of the element are in its outer shell, as compared to the maximum for that shell. This determined which elements will combine with others.

Two or more atoms combined as a molecule results in a material with different properties than the individual atoms.

Much of chemistry concerns knowing which elements combine. Chemistry isn't difficult, but to an extent, it requires a good memory.

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Polar Molecules

How does oxygen dissolve in water?

August 15, 2013

Question

Hi I love your work Ron as a grade 11 student. I appreciate what you're doing. I read your article about polar molecules but one thing still baffles me. why does oxygen dissolve in water yet it non-polar? Or is it not really dissolving into the water but has more to do with london dispersion forces between H20 and Oxygen?

thanks in Advance Mr. Kurtis, are there also any websites where I can read on this further?

Thanks in advance!

Guy - Australia (23932)

Answer

That is a tough question. I'm not sure of the answer and wasn't able to find much on it. A possible answer is How does the polarity of a substance affect its solubility in water? in Yahoo Answers.

I hope that helps

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Uses for Hydrogen

I though helium caused balloon to float

August 5, 2013

Question

Hi :)
I found this very useful except i couldn't get my brain wrapped around this:
Isn't it helium that causes balloons to float...?
Just wondering,
Thanks :)

- Australia (23908)

Answer

Hydrogen is the lightest weight molecule and is ideal for making balloons float. However, it is very inflammable, such that a spark could cause the balloon explode.

In 1937, a huge German blimp--the Hindenburg--filled with hydrogen exploded, killing many people. After that, they started using helium for floating air vessels.

Although helium is twice as heavy as a hydrogen molecule, it does not burn and is thus much safer to use in balloons.

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Acids

Meanings of acide prefixes

July 17, 2013

Question

Please! Clarify to me the meanings of the prefixes; R, H, and G in R-acid, H-acid, and G-acid respectively.

Muhammad - Nigeria (23872)

Answer

I am not sure of the meanings of those prefixes. You might look at:
Nucleotide Codes, Amino Acid Codes, and Genetic Codes to see if they apply to your studies.

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Acids

Significance of acid prefixes

July 6, 2013

Question

Please! I need some clarification on the meaning and significance of the prefixes; R, C, H and G in R-acid, C-acid, H-acid, G-acid respectively.
Thank you for your swift response.

Abu - Nigeria (23837)

Answer

Naming of those acids by the prefixes is not standard. An R-acid is crystalline sulfonic acid. I know of no clear definitions of C-acid, H-acid, G-acid.

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General

Empirical formula of a chemical compound

June 15, 2013

Question

can you explain more on the emperical formula of compounds? i would really appriciate.

israel - Zambia (23775)

Answer

A molecular formula identifies the number of each type of atom in a molecule. For example glucose is C6-H12-O6.

An empirical formula of a chemical compound is the simplest positive integer ratio of atoms present in a compound. For glucose the empirical formula is C-H2-O.

Another example is the empirical formula of hydrogen peroxide (H2-O2) is simply HO.

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General

Explain everything

June 9, 2013

Question

explain to me types of reaction, quantitative aspects of chemical change, electrostatics, ideal gases, energy and chemical change, electric circuits

Thapelo - South Africa (23760)

Answer

Feel free to go through our lessons on those topics.

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Salts

What is an acidic salt, basic salt and neutral salt?

June 2, 2013

Question

what are acidic salt, basic salt and nutral salt? define with examoles. Also define the term double salt with examples.

tanveer - Pakistan (23738)

Answer

You can create a salt by combining an acid and base, usually in water. However, some acids and some bases are "stronger" than others, resulting in salts that are not neutral.

For example,

NH4Br is an acidic made of a strong acid and a weak base.

LiF is a basic salt made of a weak acid and a strong base.

LiNO3 is a neutral salt made of a strong acid and a strong base.

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Hydrocarbon Bonding

Need details on hyrdocarbon bonding

May 26, 2013

Question

i need details on hydro carbon bonding in easy language . pls help me

alok - UAE (23720)

Answer

Hydrocarbon bonding is not easy to understand. Besides our page, you might look at Ma href="https://www.boundless.com/chemistry/atoms-molecules-and-ions/organic-compounds-1/introduction-to-hydrocarbons--14/">Introduction to Hydrocarbon Bonding for more information.

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Polar Molecules

Why are Alkynes non-polar molecules?

May 21, 2013

Question

Why the Alkyne are non-polar molecules

seipati - South Africa (23704)

Answer

Alkynes are non-polar because they cannot be dissolved in water, as do polar molecules. However, alkynes but do dissolve in other non-polar substances. A rule is that like substances dissolve in like substances.

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Polar Molecules

Are chloroform and ethanol polar or non-polar?

May 16, 2013

Question

chloroform and ethanol are a polar or non polar compound?if it is.then please answer me some details.

shefali - Bangladesh (23692)

Answer

Polar molecules are water soluble, while non-polar molecules are fat soluble.

Chloroform is more soluble in fats than in water, thus it is classified as non-polar.

Ethanol is polar, since its oxygen molecule draws electrons towards it due to its high electronegativity, causing a negative charge around itself.

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