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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 next 10 letters

Topic

Title

Country

Oxygen Solids used to obtain oxygen gas Kenya
 
Polar Molecules How is CO2 non-polar? Namibia
 
Uses of Nitrogen Questions for science project USA
 
Order of Elements in a Formula Correction in formula USA
 
Polar Molecules Why do nonpolar solutes tend to adhere China
 
General Name the following compounds Nigeria
 
Uses for Hydrogen Which is the lightest gas? Ghana
 
Polar Molecules Is an apple a polar molecule? Pakistan
 
Chemistry Basics Wants objective questions Pakistan
 
Order of Elements in a Formula Order of elements in a formula Pakistan
 

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First 10 letters


Solids used to obtain oxygen gas

Topic: Oxygen

Question

April 27, 2016

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)

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How is CO2 non-polar?

Topic: Polar Molecules

Question

April 13, 2016

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.

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Questions for science project

Topic: Uses of Nitrogen

Question

April 9, 2016

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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Correction in formula

Topic: Order of Elements in a Formula

Question

January 28, 2016

On your page regarding the order of elements in a chemical formula, you made the following statement:

"Most oxides will end in multiples of O, no matter what the alphabetical order. A good example is silicon dioxide: SO2"

However, I would just like to point out this (referring to the EXAMPLE) is wrong - I don't know if you are trying to refer to sulfur dioxide or SiO2. Just wanted to let you know so you could fix it! By the way, your page is amazing, super-informative and really helps me - thank you so much!

Shada - USA

26727

Answer

Thanks for letting me know about that typo. I corrected the formula to be SiO2 in the Order of Elements in a Chemical Formula page.

I'm also glad the material has been useful to you.

Best wishes in your studies.

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Why do nonpolar solutes tend to adhere

Topic: Polar Molecules

Question

January 9, 2016

I have a question
Explain why two nonpolar solutes (or nonpolar groups) tend to adhere to each other in aqueous solutions

qun - China

26673

Answer

This is known as the hydrophobic effect, where nonpolar substances to aggregate in aqueous solution and exclude water molecules. This occurs because interactions between the hydrophobic molecules enable the displaced water molecules to make hydrogen bonds more freely with each other and increase the number of hydrogen bonds they are involved with, thereby decreasing the overall free energy.

I hope that answers your question.

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Name the following compounds

Topic: General

Question

December 6, 2015

what is the Iupac name of the following compounds
(NH4)2SO4.Fe2(SO4)3.24H2O,
(NH4)2SO4.Al2(SO4)3.24H2O,
K2SO4.Cr2(SO4)3.24H2O.

Musa - Nigeria

26591

Answer

I am sorry, but I do not have that information.

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Which is the lightest gas?

Topic: Uses for Hydrogen

Question

December 2, 2015

PLS IS H2 GAS AND HE GAS WHICH ONE IS THE LIGHTEST GAS?

YUNUSAH - Ghana

26586

Answer

The Hydrogen molecule (H2) weighs 2 atomic units (AU), while the Helium atom is heavier and weighs 4 AU.

The problem is that Hydrogen is highly inflammable, thus Helium is usually used in balloons, because it does not burn and is safer.

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Is an apple a polar molecule?

Topic: Polar Molecules

Question

October 23, 2015

Apple is polar molecule or non-polar molecule......?

M.Naveed - Pakistan

26468

Answer

An apple is made up of many different types of molecules. Some may be polar and some non-polar.

If you select a specific molecule or material in an apple, you can find whether it is polar or not.

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Wants objective questions

Topic: Chemistry Basics

Question

October 21, 2015

please kindly send me an objective type questions

haseeb - Pakistan

26462

Answer

I'm sorry but the only questions we have right now are in the Mini-Quiz. However, there is a Graded Chemistry test you can take.

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Order of elements in a formula

Topic: Order of Elements in a Formula

Question

September 7, 2015

hi sir, I have a question that why we write Carbon first and then Hydrogen in formula of Benzene..?? and is there any general rule for order of elements in formulas other than Hill system!; thank you very much...!

husnain - Pakistan

26359

Answer

The Hill system states that carbon is listed first and then hydrogen in hydrocarbons. Thus the formula for Benzene is C6H6.

In ionic compounds such as NaCl, the positive ion is listed first.

Another rule is that oxides end in O and acids start with H in most cases.

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