List of Topics


 

Chemistry Feedback

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 15 letters

Title

Topic

Country

Finding pure nitrogen Nitrogen USA
 
Timeline of the development of chemistry General Philippines
 
Biological importance of nitrogen Uses of Nitrogen Algeria
 
Azeotropic Mixture Order of Elements in a Formula Nigeria
 
Why does an apple change color when cut open? General India
 
Why is nitrogen used in tires? Uses of Nitrogen USA
 
Microwaves and polar molecules Polar Molecules India
 
Define Electronegativity matter Polar Molecules Ethiopia
 
About Nitrogen Uses of Nitrogen Philippines
 
Examples of liquid non-polar compounds Polar Molecules India
 
Why is oxygen classified as non-polar? Polar Molecules Namibia
 
Use of arrow sign in chemical reaction Chemical Equations India
 
Can I used compressed nitrogen to paint a boat? Uses of Nitrogen USA
 
Solids used to obtain oxygen gas Oxygen Kenya
 
How is CO2 non-polar? Polar Molecules Namibia
 

Next 15 letters

 





Nitrogen

Finding pure nitrogen

August 25, 2018

Question

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.

Return to List

General

Timeline of the development of chemistry

May 25, 2018

Question

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.

Return to List

Uses of Nitrogen

Biological importance of nitrogen

March 17, 2018

Question

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.

Return to List

Order of Elements in a Formula

Azeotropic Mixture

October 27, 2017

Question

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.

Return to List

General

Why does an apple change color when cut open?

June 9, 2017

Question

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.

Return to List

Uses of Nitrogen

Why is nitrogen used in tires?

May 28, 2017

Question

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.

Return to List

Polar Molecules

Microwaves and polar molecules

March 31, 2017

Question

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.

Return to List

Polar Molecules

Define Electronegativity matter

December 6, 2016

Question

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

Return to List

Uses of Nitrogen

About Nitrogen

August 11, 2016

Question

Nitrogen physical properties,origin,characteristics and uses?

Noel - Philippines (27203)

Answer

Read Nitrogen and Uses for Nitrogen.

Return to List

Polar Molecules

Examples of liquid non-polar compounds

July 10, 2016

Question

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.

Return to List

Polar Molecules

Why is oxygen classified as non-polar?

June 25, 2016

Question

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.

Return to List

Chemical Equations

Use of arrow sign in chemical reaction

May 16, 2016

Question

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.

Return to List

Uses of Nitrogen

Can I used compressed nitrogen to paint a boat?

April 29, 2016

Question

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.

Return to List

Oxygen

Solids used to obtain oxygen gas

April 27, 2016

Question

Name two solids that can be heated to obtain oxygen gas.

Engneer - Kenya (26969)

Answer

Mercuric oxide (HgO), potassium chlorate (KClO3), and sodium peroxide (Na2O2)

Return to List

Polar Molecules

How is CO2 non-polar?

April 13, 2016

Question

Why do we say Carbondioxide gas is a non-polar in terms of charges on it. It seems like oxygen has more electrons than carbon in gas. I am confused help me please.

Mweneni - Namibia (26927)

Answer

The atoms in carbon dioxide (CO2) are arranged in a line, with the oxygen atoms on the outside. This makes the distribution of charges symmetrical, making the gas molecules non-polar.

See the illustration of CO2 in Polar and Non-Polar Molecules. I hope that helps you understand the concept.

Return to List

Next 15 letters


Misc


Questions and comments

Do you have any questions, comments, or opinions on this subject? If so, send an email with your feedback. I will try to get back to you as soon as possible.


Share this page

Click on a button to bookmark or share this page through Twitter, Facebook, email, or other services:

 

Students and researchers

The Web address of this page is:
www.school-for-champions.com/sfc/
feedback_course.cfm

Please include it as a link on your website or as a reference in your report, document, or thesis.

Copyright © Restrictions


Where are you now?

School for Champions

Chemistry Feedback




Subjects in website



Let's make the world a better place

Be the best that you can be.

Use your knowledge and skills to help others succeed.

Don't be wasteful; protect our environment.

You CAN influence the world.





Live Your Life as a Champion:

Take care of your health

Seek knowledge and gain skills

Do excellent work

Be valuable to others

Have utmost character

Be a Champion!



The School for Champions helps you become the type of person who can be called a Champion.