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Mikhail S. Tswett (1872-1919) realized that ________ was an efficient method for separating compounds.

Elza [17]

Answer:

Chromatography

Explanation:

Mikhail Semyonovich Tswett was a Russian-Italian botanist born on the 14th of May, 1872 in Asti, Italy and died on the 26th of June, 1919 in Voronezh, Russia. He is famously known for his invention of the separation technique called chromatography.

Chromatography was developed in 1903 by the Russian-Italian botanist Mikhail Semyonovich Tswett using a column of calcium carbonate to colourfully separate plant pigments extracted through the use of ether and alcohol, this separation technique is generally referred to as adsorption chromatography.

Hence, Mikhail S. Tswett (1872-1919) realized that chromatography was an efficient method for separating compounds without prior knowledge of the quantities and nature of the chemicals present in a mixture.

Mixture can be defined as a combination of two or more substances which are present in varied proportion and can be visibly seen by with our naked eyes.

In Science, there are two (2) main types of mixture and these are;

I. A homogeneous mixture: it can be defined as any liquid, solid or gaseous mixture which has an identical or uniform composition and properties throughout any given sample of the mixture. In Chemistry, all solutions are considered to be a homogeneous mixture. For example, aqueous hydrogen chloride is a homogeneous mixture of water and hydrogen chloride.

This ultimately implies that, in a homogeneous mixture, parts are uniformly (evenly) distributed.

II. A heterogenous mixture: it can be defined as any mixture which has a different or non-uniform composition and properties throughout any given sample of the mixture. This ultimately implies that, the constituents of a heterogenous mixture always remain separate in the sample and as such comprises of two or more phases.

For example, a mixture of sand and coffee is simply a heterogenous mixture and can easily be separated into their various components.

7 0

3 years ago

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Which of the following tests might confuse blood with leather?

Fiesta28 [93]

The answer is c teichmann

3 0

3 years ago

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What class license do you need to operate a boat?

ycow [4]

New York

Motorboats - Any individuals born on or after 5/1/96 are now required to successfully complete an approved course in boater education in order to operate a motorboat. Approved courses include those offered by NYS Parks, the U.S. Coast Guard Auxiliary or the U.S. Power Squadron. Individuals less than 10 years of age may not take this course of instruction.

Personal Watercraft - Operators may not operate a Personal Watercraft (JetSki, SeaDoo, etc.) unless they are at least 14 years of age and hold a boater safety certificate issued by State Parks, the USCG Auxiliary or the US Power Squadron for having completed a an 8-hour classroom based course of instruction.

A person without a safety certificate may operate a PWC when accompanied by someone over 18 years of age who is the holder of a boater safety certificate. For the purposes of this section, "accompanied" shall mean upon the same PWC.

North Carolina PWC operators between 14 and 16 years of age if they want to operate on their own .

North Dakota No person of twelve through fifteen years of age may operate a motorboat (includes personal watercraft, i.e. Jet skis, etc.) propelled by over a ten horsepower motor unless the operator is accompanied by a person eighteen years of age or older or the operator has taken and passed a boating course approved by the Department.

N Mariana Islands All

Ohio Anyone born on or after January 1, 1982 who operates a powerboat grater than 10 horsepower.

Oklahoma All persons from 12 to less than 16 years of age.

Oregon Boaters 12 and older operating a motorboat greater than 10 horsepower.

Pennsylvania

Operators born on or after January 1, 1982 to operate motorboats greater than 25 horsepower and all operators of PWC.

Puerto Rico Anyone born after July 1, 1972.

Rhode Island All PWC operators and anyone born after January 1, 1986 operating a vessel powered by an engine of ten (10) or more horsepower.

South Carolina Persons younger than 16 years of age that operate a boat powered by 15 horsepower engine or greater by themselves.

South Dakota No requirement

Tennessee TN resident born after January 1, 1989 must pass a proctored exam.

Texas Operators between ages 13-17 years.

Utah Personal Watercraft operators 12 through 17 years old.

Vermont Any person born on or after January 1, 1974.

Virginia Beginning July 1, 2009 compliance with boating safety education will be phased in according to age category.

Washington

Operators of motorboats with 15 horsepower or greater, must be 12 years of age or older. Is being phased in beginning January 2008 starting with 12 to 20 year olds and increasing age each year until fully implemented in 2014.

West Virginia Anyone born after December 31, 1986.

Wisconsin Anyone born on or after January 1, 1989 and who is at least 16 years old.

7 0

3 years ago

Plz settle this arguement<br> 0/10 which is the best?

mr_godi [17]

I like the first photo a lot get it girlll

4 0

3 years ago

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Scott Test solutions that turn blue indicate the presence of:

zubka84 [21]

The Scott test is a preliminary colorimetric method to analyze cocaine. A blue color result in the final step denotes a positive indication for cocaine; however, some pharmacological products may lead to false positives when concentration is higher than 1 mg

5 0

3 years ago