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Feedback Q&A on Chemistry

by Ron Kurtus

Readers have sent in a total of 548 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 most recent 10 letters

Topic

Title

Country

Nitrogen Finding pure nitrogen USA
 
General Timeline of the development of chemistry Philippines
 
Uses of Nitrogen Biological importance of nitrogen Algeria
 
Order of Elements in a Formula Azeotropic Mixture Nigeria
 
General Why does an apple change color when cut open? India
 
Uses of Nitrogen Why is nitrogen used in tires? USA
 
Polar Molecules Microwaves and polar molecules India
 
Polar Molecules Define Electronegativity matter Ethiopia
 
Uses of Nitrogen About Nitrogen Philippines
 
Polar Molecules Examples of liquid non-polar compounds India
 

Next 10

 





Finding pure nitrogen

Topic: Nitrogen

Question

August 25, 2018

Dear sir/madam
hi
My question is there any way to find that there is other material or products are in pure nitrogen.

Ben - USA

28679

Answer

In any method of obtaining "pure" nitrogen, there are always some impurities. A primary method to find out if there are impurities and what they are is by heating the gas and using a spectrometer to see the composition of the material. Each element has a distinct spectral signature.

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Timeline of the development of chemistry

Topic: General

Question

May 25, 2018

Timeline of the development of chemistry

Jesus Ramon Neopolo - Philippines

28565

Answer

You can an extensive list at Chronology of Major Events in Chemistry.

Another good listing is Timeline of Chemistry.

I hope that helps. Best wishes for success in your studies.

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Biological importance of nitrogen

Topic: Uses of Nitrogen

Question

March 17, 2018

hello
i've project under title :"Elements of the nitrogen group."
can you plaese give me the Biological importance of this elements please .
please send the answer to my email address
and thank you

sarra - Algeria

28476

Answer

Nitrogen is a component of amino acids and urea. Amino acids are the building blocks of all proteins. Proteins comprise not only structural components such as muscle, tissue and organs, but also enzymes and hormones essential for the functioning of all living things. Urea is a byproduct of protein digestion.

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Azeotropic Mixture

Topic: Order of Elements in a Formula

Question

October 27, 2017

Whats Azeotropic Mixture

Saviour - Nigeria

28301

Answer

An Azeotropic Mixture is known as a constant boiling point mixture. That means the mixture cannot be separated by boiling or distillation. An example of such a mixture is 5% water and 95% ethanol.

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Why does an apple change color when cut open?

Topic: General

Question

June 9, 2017

Why apple turns into red colour after cutting into slides?

Maddakam - India

28081

Answer

Apples start to oxidize once they are cut open. That is the reason the colour changes.

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Why is nitrogen used in tires?

Topic: Uses of Nitrogen

Question

May 28, 2017

Why is it used in tires?

Allen - USA

28064

Answer

Air is made up of 78% nitrogen, so it is already in inflated tires. Pure nitrogen has the advantage of keeping a more stable pressure in the tires over a long run. Race cars use pure nitrogen to avoid pressure changes when the tires heat up during a race.

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Microwaves and polar molecules

Topic: Polar Molecules

Question

March 31, 2017

Why polar molecule are microwave active

saurabh - India

27975

Answer

Microwave ovens work by causing polar molecules to spin rapidly and thus heat up the material. The wavelength of the microwave is such that its frequency or change in direction works well in causing the polar molecules to rotate. Non-polar molecules are not really affected by the microwave radiation.

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Define Electronegativity matter

Topic: Polar Molecules

Question

December 6, 2016

Define Electron Negativity matter on polarity and non polarity

Fanuel - Ethiopia

27533

Answer

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. Using the Electronegativities we can predict whether a given bond will be non-polar, polar covalent, or ionic. The greater the difference in electronegativity the more polar the bond.

See Bond Polarity and Polar vs Non-Polar Molecules for more information.

I hope that helps

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About Nitrogen

Topic: Uses of Nitrogen

Question

August 11, 2016

Nitrogen physical properties,origin,characteristics and uses?

Noel - Philippines

27203

Answer

Read Nitrogen and Uses for Nitrogen.

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Examples of liquid non-polar compounds

Topic: Polar Molecules

Question

July 10, 2016

Example of liquid non polar compounds.

Raman - India

27142

Answer

Oils, including vegetable oil and related products like gasoline, are the most common examples of non-polar liquids.

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Summary

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