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Feedback Q&A on Chemistry

by Ron Kurtus

Readers have sent in a total of 552 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




Nitrogen Preparation of nitrogen gas South Sudanese
Nitrogen May GOD bless you Uganda
Similar to Baking Chemistry project Canada
Polar Molecules How can oxygen mix in water? India
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

Next 10

Preparation of nitrogen gas

Topic: Nitrogen


February 11, 2020

Am in need of preparation of nitrogen gas

Samson - South Sudanese



Nitrogen gas is prepared in the laboratory by heating the mixture of ammonium chloride and sodium nitrite in the ratio of 1:1.

I hope that helps.

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May GOD bless you

Topic: Nitrogen


March 17, 2019

May GOD bless you

IJJO - Uganda



Thank you for the kind blessing.

Best wishes for success in your work. I am sure that God is looking after you.

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Chemistry project

Topic: Similar to Baking


December 21, 2018

Hi Ron,

I and a friend are doing a project on how baking is similar to chemistry, and we found a lot of great information on your website. Can you recommend us any other resources or websites to help us in our project? Thank you so much!

Daillin and - Canada



Take a look at our Chemistry Resources for a listing of places to get more information.

Best wishes for success in your project. Let me know how things turn out.

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How can oxygen mix in water?

Topic: Polar Molecules


October 26, 2018

Water is a polar molecule and oxygen is a non polar molecule ..For aquatic animals they have to get oxygen from water with gills ..Then we can say oxygen mixes with water to from a solution ..How does a non polar solvant mixes with a polar solvation? ??

Uday - India



Oxygen molecules can actually slip between the network of water molecules into “pockets” that exist in-between H2O molecules. For a complex explanation see: Predicting oxygen solubility in water.

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Finding pure nitrogen

Topic: Nitrogen


August 25, 2018

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

Ben - USA



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


May 25, 2018

Timeline of the development of chemistry

Jesus Ramon Neopolo - Philippines



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


March 17, 2018

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



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


October 27, 2017

Whats Azeotropic Mixture

Saviour - Nigeria



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


June 9, 2017

Why apple turns into red colour after cutting into slides?

Maddakam - India



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


May 28, 2017

Why is it used in tires?

Allen - USA



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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