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Feedback Q&A on Chemistry

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 most recent 10 letters

Topic

Title

Country

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
 
Polar Molecules Why is oxygen classified as non-polar? Namibia
 
Chemical Equations Use of arrow sign in chemical reaction India
 
Uses of Nitrogen Can I used compressed nitrogen to paint a boat? USA
 

Next 10

 





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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Why is oxygen classified as non-polar?

Topic: Polar Molecules

Question

June 25, 2016

why oxgyen is classfied as non polar and carbon dioxide polar ?

Johannes - Namibia

27105

Answer

Whether a molecule is polar or non-polar depends on its geometry. Oxygen exists as a molecule of two oxygen atoms. The combination balances the distribution of their electrons.

Carbon dioxide is also a non-polar gas for the same reason.

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Use of arrow sign in chemical reaction

Topic: Chemical Equations

Question

May 16, 2016

Some of the chemical reactions are represented by arrow sign and some are by equal sign. What is the difference between this two types?

Kind Regards,

Mohammad - India

27008

Answer

If the chemical reaction mainly goes in one direction, it is represented by an arrow to indication the direction. For example C + O2 --> CO2.

Some reactions can readily go in both directions and are represented by a double arrow ( <---> ) or an equals sign.

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Can I used compressed nitrogen to paint a boat?

Topic: Uses of Nitrogen

Question

April 29, 2016

Hey there, I am Nelson from Nautiques Boat Care. My question is can I use it nitrogen as a substitute to regular air pressure when I spray the paint or gel coat to avoid moisture?

Jose - USA

26971

Answer

Since air is made up of 80% nitrogen, using compressed nitrogen to spray the paint. Besides nitrogen and oxygen, air also includes water vapor.

However, compressed nitrogen probably would be more expensive than compressed.

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