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Answers to Readers' Questions on Chemistry:
Mixtures
The following 9 comments and questions have been sent in. They are listed according to date.
List of first 10 items
- Can you explain fractional distillation?
- Chemistry joke
- Ways of classifying mixtures?
- Difference between a solvent and a solution?
- Difference between a compound and a mixture?
- Left studying for test until the last second
- Does a mixture absorb or release heat?
- I got all the quiz answers correct
- Explain about automobile pollution
Can you explain fractional distillation?
Question
May 15, 2009
Can you explain me fractional distillation
Saptarshi - India
17747
Answer
Fractional distillation is the separation of a mixture into its component parts, or fractions.
For example, your could distill a mixture of water and ethanol by heating it to about 75 degrees. Since ethanol boils at 78.4 °C and water boils at 100 °C, the ethanol will turn to a gas, leaving the water as a liquid.
Chemistry joke
Question
February 13, 2009
Scientists say: If you are not part of the solution, then you are part of the precipitate.
- USA
17269
Answer
Good chemistry joke.
Ways of classifying mixtures?
Question
January 28, 2008
Ways of classifying mixtures?
Anne - Canada
15228
Answer
The paragraph Types of Mixtures lists them.
http://www.school-for-champions.com/chemistry/mixtures.htm
Also see: http://www.school-for-champions.com/chemistry/mixture_types.htm for more details.
These are ways of classifying them.
Difference between a solvent and a solution?
Question
January 22, 2008
Okey, my question is what is the difference between a solvent and a solution?
Frida - USA
15181
Answer
See our lesson on Solutions at:
http://www.school-for-champions.com/chemistry/solutions.htm
Difference between a compound and a mixture?
Question
December 18, 2007
what is the difference between a compound and a mixture?
dolores - USA
14994
Answer
A compound is the chemical combination of two or more different elements. The combination is always in the same proportion. A compound cannot be separated by physical means, such as settling.
A mixture can be separated and may have varying proportions of materials.
Left studying for test until the last second
Question
November 7, 2007
ok i have a test tommorow and i left it to the last secon its on puresubstances an d mixtures im in grade 7 HELP
- Canada
14732
Answer
You can look over our material on solutions and mixtures. It may help you. Look over your assignment material too.
It isn't a good idea to wait until the last second to study for a test. But I'm sure you know that.
Does a mixture absorb or release heat?
Question
September 14, 2007
does the mixture absorb or release heat?
hafizuddin - Malaysia
14396
Answer
A mixture is simply mixing materials together that can later be separated. There should be no heat gained or released.
But if there is a chemical reaction as a result of the mixture, then heat can be released. If the materials require heat to cause the reaction, it is absorbed.
You need to separate the act of making a mixture from causing a chemical reaction.
I got all the quiz answers correct
Question
September 3, 2007
I really liked the quiz that u guys made. I got all of them correct.
- USA
14338
Answer
Good going!!
Explain about automobile pollution
Question
July 10, 2007
due to high volume of vehicles along EDSA during rush hour,one can't help but notice how polluted the air had become.exhaust from combustion engines in vehicles contribute greatly to air pollution.
1.are these air pollutants heterogeneous or homogeneous?explain
2.what can be suggested to reduce if not eliminate air pollutants from vehicles?
bhernadette - Philippines
14052
Answer
Air pollution from automobiles is a mixture of soot particles and a solution of various gases, water vapor and acids. Since it varies so much, you would consider it heterogeneous. Improving gasoline mileage, improving engine efficiency, reducing the number of automobile on the road, and changing to electric cars are some ways to reduce pollution.
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