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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

Chemistry problem General Ghana
 
Ferrous and non ferrous metals Order of Elements in a Formula Solomon Islands
 
What are newly discovered elements? Periodic Table Nigeria
 
What is titration? General Malawi
 
Long-chain alkane Hydrocarbon Bonding Nigeria
 
What chemcial reactions occur in baking a cake? Similar to Baking Mexico
 
What is valence bond theory? General India
 
Mixing distilled water in a car battery Acids USA
 
How do molecules form a solution? Polar Molecules Palestine
 
Using nitrogen to replace steam Uses of Nitrogen Indonesia
 
How do you separate various mistures? Mixtures India
 
What are non-polars and polars? Polar Materials South Africa
 
How can carbon tetrachloride dissolve grease? Polar Molecules Philippines
 
Calculate percentage ionic character in HCl bond Polar Molecules India
 
What are polar molecules ans dipoles? Polar Molecules Pakistan
 

Next 15 letters

 




First 15 letters


General

Chemistry problem

April 11, 2012

Question

A 5.000-g sample of a hydrate of copper(II)sulfate,CUSO4.XH2O,is heated until all the water is driven off. After the anhydrous salt cools,its mass is 3.196g.calculate the value of X.

Otis - Ghana (22582)

Answer

I'm sorry, but I can't solve homework problems.

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Order of Elements in a Formula

Ferrous and non ferrous metals

February 23, 2012

Question

I need some information on chemestry in particular to areas such as periodic table, order of element on ferrous and non ferrous metals etc

Thompson - Solomon Islands (22446)

Answer

You can get some good information from examining: Periodic Table of the Elements.

Also see: Classifications of Magnetic Materials and Ferrous Metals List.

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Periodic Table

What are newly discovered elements?

February 16, 2012

Question

What are new discovered elements and their chemical properties

Inayatullah rabiu - Nigeria (22426)

Answer

The newest elements with atomic weights of 110, 111 and 112 are called darmstadtium (Ds), roentgenium (Rg) and copernicium (Cn).

They are so unstable that their chemical properties have no been established.

For a background on them, see: New elements join the periodic table.

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General

What is titration?

December 11, 2011

Question

What is titration?

Francis - Malawi (22268)

Answer

Titration is a method used in chemistry to determine exactly when a chemical reaction ends in order to find the precise quantity of the substance causing the reaction. It is measured in the titration flask.

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Hydrocarbon Bonding

Long-chain alkane

November 27, 2011

Question

Why that long-chain alkane crack

Habib - Nigeria (22211)

Answer

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

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Similar to Baking

What chemcial reactions occur in baking a cake?

November 10, 2011

Question

When you cook a cake what chemical reactions occurs? I need Identify 3 chemicals reactions state what type of chemical reactions they are and show the reactions.

rios - Mexico (22162)

Answer

The cake mix includes baking soda (Sodium Hydrogencarbonate) plus water. When heated, it produces tiny bubbles of carbon dioxide gas, which makes the cake light and fluffy. Sour cream or some other acidic material is added.

Sodium Hydrogencarbonate + Acid -> Sodium Salt + Carbon Dioxide + Water

Also, heat causes protein from the eggs to change and make the cake firm.

Butter or oil keeps the heat from drying out the cake.

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General

What is valence bond theory?

November 6, 2011

Question

what is valence band theory?

damini - India (22145)

Answer

Valence bond theory explains chemical bonding. According to this theory a covalent bond is formed between the two atoms by the overlap of half filled valence atomic orbitals of each atom containing one unpaired electron.

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Acids

Mixing distilled water in a car battery

October 18, 2011

Question

Hi! Just want to know if the distilled water used in car batteries or any other machines is the same as the distilled water you can buy at store and drink? Because I was injecting distilled water labelled gallon in the auto-scrubber machine batteries I use for cleaning, and suddenly it sprinkled up like a mist toward my face when it got full. I was not hit directly, but felt some though. Just wondering if there are any reasons for concern with this "distilled water" thing.

Thank you.

- USA (22091)

Answer

Distilled water is free of any salts that may be dissolved in the water. It is the same as used in car batteries, irons and drinking water.

However, note that you must be very careful in mixing water in an acid or acid in water. The reason is that if the acid is concentrated there can be a reaction with the water, essentially boiling the water and splashing it outward.

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Polar Molecules

How do molecules form a solution?

October 15, 2011

Question

I'm astudent in bard collage in palestine 18 years old i want to be chemists.
thank you for the lesson.
but i hsave aquestions about solutions,how non-polar molecules can form asoulution with another ono-polar molecules.please i want an example.
sorry because my english language is not good,my native language is arabic.


thank you.

adam - Palestine (22077)

Answer

It is good to start by first looking at chemical mixtures. (See: Mixtures)

Muddy water is an example of a mixture, where the mud particles will slowly settle to the bottom, separating from the water molecules.

In a solution, the molecules of each substance mix together and do not separate. (See: Solutions)

They also do not react chemically with each other. Since polar molecules have one side with a positive charge and the other with a negative charge, two materials consisting of polar molecules will form a solution. This is because the charges slightly hold the particles in place. A solution of water and alcohol is a good example.

Non-polar molecules can dissolve in a polar material, but they can be separated. For example CO2 gas can dissolve in water, but can be releases as bubbles. However, CO2 and O2 form a non-polar solution.

I hope that helps. Best wishes in becoming a Chemist. It is a challenging field with great potential.

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Uses of Nitrogen

Using nitrogen to replace steam

September 21, 2011

Question

Can we use nitrogen (gas) replaced Steam (11.5 Bar, 200 deg C) for blowing batch digester to reduce steam consumption. We have excess N2 product at O2 Plant.

Surya - Indonesia (22006)

Answer

Sorry, but we don't have that information.

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Mixtures

How do you separate various mistures?

August 21, 2011

Question

activity for separating water and vinegar, water and oil, water and ink.

deepa - India (21909)

Answer

Water and vinegar comprise a solution. You can separate them through distillation, because they have different boiling points.

Water and oil will separate after being mixed by letting the oil float up to the top of the water.

Although ink particles with slowly settle to the bottom, it may take a very long time. Allowing the water-ink mixture to soak into a paper towel will separate the ink from the water, as well as to separate the different colors of the ink.

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Polar Materials

What are non-polars and polars?

August 13, 2011

Question

what are non-polars and polars

portia - South Africa (21890)

Answer

See Polar and Non-Polar Molecules for information.

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Polar Molecules

How can carbon tetrachloride dissolve grease?

July 31, 2011

Question

Do polar like carbon tetrachloride can remove oil and greases? why?

Naomi - Philippines (21853)

Answer

Carbon tetrachloride is non-polar because its four chlorine atoms are positioned symmetrically as corners in a tetrahedral configuration joined to a central carbon atom by single covalent bonds.

Oil and grease are non-polar materials. The rule is that non-polar materials is that they dissolves other non-polar materials.

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Polar Molecules

Calculate percentage ionic character in HCl bond

July 23, 2011

Question

The dipole moment of Hcl is 1.03D & Its bond length is 1.27 armstrong calculate the percentage ionic character in Hcl bond.

Dheeraj - India (21835)

Answer

Sorry, but we don't have that information.

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Polar Molecules

What are polar molecules ans dipoles?

July 13, 2011

Question

(1)WHAT ARE POLAR AND NONPOLAR MOLECULES? (2)WHAT ARE THE DIPOLE DIPOLE FORCES, ION DIPOLE FORCE,LONDON DIPERSSION, HYDROGEN BONDING DEFINE IT?

VIKASH - Pakistan (21807)

Answer

A polar molecule has its atoms arranged from the chemical bonding such that there are more positive charges on one side of the molecule and negative charges on the other side. The affects how it will form solutions with other molecules.

A molecule with a permanent dipole moment is called a polar molecule.

A non-polar molecule has its charges close to the same on each side of the molecule.

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