Chemistry Feedback
by Ron Kurtus
Readers have sent in a total of 547 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 |
| 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 |
| Questions for science project | Uses of Nitrogen | USA |
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.
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.
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.
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.
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.
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.
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
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.
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.
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.
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.
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.
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)
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.
Uses of Nitrogen
Questions for science project
April 9, 2016
Question
Hi, my name is Jennifer. I am emailing you because this is for my science class project and my subject was on nitrogen. And just wondering if you could answer at least two questions for me. Q1: Is nitrogen good or bad for you? Q2: when was nitrogen discovered for these uses? Please answer ASAP, please and thank you. Thank you for your time to email this!
Jennifer - USA (26918)
Answer
Since nitrogen makes up about 78% of the air you breathe, it certainly is not bad for you. What makes it good for you is that it makes sure you don't get too much oxygen at once.
Nitrogen is a key component of biological molecules such as proteins (which are made from amino acids, and nucleic acids. The nitrogen cycle in nature is very important.
Nitrogen was discovered by Daniel Rutherford in 1772 at Scotland.
I hope that helps. Best wishes for success in your science project.
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