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Chemistry Feedback

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 15 letters

Title

Topic

Country

Name the following compounds General Nigeria
 
Which is the lightest gas? Uses for Hydrogen Ghana
 
Is an apple a polar molecule? Polar Molecules Pakistan
 
Wants objective questions Chemistry Basics Pakistan
 
Order of elements in a formula Order of Elements in a Formula Pakistan
 
About hydrogen Hydrogen India
 
Azeotropic Hydrocarbon Bonding Australia
 
Which molecule is more polar than the other? Polar Molecules India
 
Send me notes and questions General Malawi
 
Temperature and organic molecules General South Africa
 
What is a solution? Mixture Types Pakistan
 
Why are solid and liquid oxygen blue? Oxygen Nepal
 
Can there be more protons than neutrons in a nucleus? Isotopes Ghana
 
Is polluted water a suspension or solution? Mixture Types Japan
 
Which is more polar water or alcohol? Polar Molecules USA
 

Next 15 letters

 




First 15 letters


General

Name the following compounds

December 6, 2015

Question

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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Uses for Hydrogen

Which is the lightest gas?

December 2, 2015

Question

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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Polar Molecules

Is an apple a polar molecule?

October 23, 2015

Question

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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Chemistry Basics

Wants objective questions

October 21, 2015

Question

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

Order of elements in a formula

September 7, 2015

Question

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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Hydrogen

About hydrogen

August 16, 2015

Question

How can I use hydrogen?

alpesh - India (26277)

Answer

You can use as well as create hydrogen in chemical reactions. It was once used in balloons but proved to be dangerous, because it it inflammable.

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Hydrocarbon Bonding

Azeotropic

July 16, 2015

Question

Can 80% Propane be bonded with 20% Ethane to be fused together to be near azeotropic

Charles - Australia (26176)

Answer

I'm sorry, but I don't have that information.

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Polar Molecules

Which molecule is more polar than the other?

June 16, 2015

Question

How Do we know which molecule is more polar than the other? I Didn't not understand it completely.

Rohan - India (26093)

Answer

The configuration of the atoms in a molecule determine whether it is polar, such that one side has more positive charges and the other more negative. However, it is not easy to determine the configuration. In some cases, you can verify there are more charges on one side as compared to a different molecule.

The web page Molecular polarity gives some good information on the subject.

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General

Send me notes and questions

May 23, 2015

Question

i want u guyz to send me note and questions so that i can answer them all

Alfred - Malawi (26024)

Answer

The best thing to do is to go through the Chemistry lessons and try to answer the Mini-Quiz questions.

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General

Temperature and organic molecules

May 20, 2015

Question

What is the relationship between temperature and the properties of organic molecules?

Banele - South Africa (26016)

Answer

Temperature can determine whether organic molecules are as a gas, liquid, or solid. Also, at certain temperatures, the chemical reactions may occur with other materials. For example, wood will burn or oxidize when the temperature is high enough.

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Mixture Types

What is a solution?

May 9, 2015

Question

What is solution

- Pakistan (25988)

Answer

See Chemical Solutions for an explanation.

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Oxygen

Why are solid and liquid oxygen blue?

April 4, 2015

Question

Although oxygen gas is colorless, why the liquid and solid forms of oxygen are blue?

Dilip - Nepal (25886)

Answer

The blue color of a material like solid or liquid oxygen comes from blue wavelengths being selectively reflected from the material. Since the molecules of oxygen gas are so widely spread apart, you don't see the color under ordinary conditions. However, when you look into the sky, the layer of oxygen is very thick and the blue wavelengths are reflected to the Earth.

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Isotopes

Can there be more protons than neutrons in a nucleus?

March 1, 2015

Question

Pls can the number of protons be more than the number of neutons in a particular nucleus?

Umar - Ghana (25803)

Answer

There are only two stable atoms or isotopes with more protons than neutrons.Hydrogen only has 1 proton and no neutrons. The Helium-3 isotope has 2 protons and 1 neutron.

There are other isotope with more protons than neutrons--such as Lithium-4 and Carbon-8--but they are unstable and radioactive, such that they decay into a stable form.

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Mixture Types

Is polluted water a suspension or solution?

February 24, 2015

Question

IS POLLUTED WATER A COLLOID SUSPENSION OR A SOLUTION I NEED TO KNOW I HAVE A TEST SOON PLEASE HELP

nekopockygurl - Japan (25787)

Answer

The causes of polluted water can be complex.

Usually polluted water is a mixture of dirty material. Some chemicals can dissolve in the water to make the pollution a solution. Materials in the water that could create a colloid suspension would consist of particles that do not settle.

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Polar Molecules

Which is more polar water or alcohol?

February 22, 2015

Question

which is more polar water or alcohol? or are they same

- USA (25779)

Answer

Water is more polar because it has opposite signs on both the ends. Also, water doesn't have the non-polar carbon-carbon bonds.

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