accidental discovery sachrin

Name Accidental Discoveries: Saccharin By Joyce Furstenau Have you ever licked your fingers after finishing off a tasty treat? In 1879, a chemist named Constantin Fahlberg was working on a project at Johns Hopkins University to find uses for coal tar. After a day at work in the lab, Fahlberg went home for supper. His wife had prepared rolls to go along with the meal. After Fahlberg took a bite of a roll, he thought it tasted especially sweet. He asked his wife if she had added anything to sweeten the rolls. She told him she hadn't. She thought the rolls tasted the same as always. Fahlberg wondered where the extra sweetness came from. He looked at his unwashed hands. He thought perhaps they still had residue from his experiments with coal tar on them. Somehow he figured out that the chemicals on his hands might be the source of the sweetness. He went back to his lab the next day. He began to analyze the compounds in the coal tar. When he finally figured it out, he called the chemical saccharin (pronounced sak-er-in). Saccharin is now used as an artificial sweetener. It has no calories because it has no food energy. Saccharin has been used to sweeten such things as drinks, candies, medicines, and toothpaste. During the First World War, a sugar shortage prompted widespread use of this product. If Fahlberg had used proper hygiene, we might never have enjoyed the many sweet, calorie-free saccharin products on the market today. Accidental Discoveries: Saccharin Questions 1. What material was Fahlberg testing in his lab at Johns Hopkins University? 2. What did he eat that tasted sweeter than usual? A. potatoes B. cake C. corn D. rolls 3. Why did Fahlberg still have coal tar residue on his hands? A. He forgot to wash his hands. B. He couldn't wash it off. C. He shoveled coal tar into the furnace before dinner. D. He washed his hands with coal tar. 4. What did Fahlberg name his sweet discovery? A. coal syrup B. saccharin C. sweet spot D. sugar pie Fahlberg made his accidental discovery because he forgot to wash his hands. Even though he made this important discovery, why do you think it is more important than ever to wash your hands before handling food today?

Upload: ramesh-adwani

Post on 14-Apr-2016

212 views

Category:

Documents

0 download

Report

Download

Embed Size (px):

DESCRIPTION

ayuda a mejorar ingles

TRANSCRIPT

Name

Accidental Discoveries: SaccharinBy Joyce Furstenau

Have you ever lickedyour fingers after finishingoff a tasty treat? In 1879, achemist named ConstantinFahlberg was working ona project at Johns HopkinsUniversity to find uses forcoal tar. After a day atwork in the lab, Fahlbergwent home for supper. Hiswife had prepared rolls to go along with the meal. After Fahlbergtook a bite of a roll, he thought it tasted especially sweet. He askedhis wife if she had added anything to sweeten the rolls. She told himshe hadn't. She thought the rolls tasted the same as always.

Fahlberg wondered where the extra sweetness came from. Helooked at his unwashed hands. He thought perhaps they still hadresidue from his experiments with coal tar on them. Somehow hefigured out that the chemicals on his hands might be the source ofthe sweetness.

He went back to his lab the next day. He began to analyze thecompounds in the coal tar. When he finally figured it out, he calledthe chemical saccharin (pronounced sak-er-in).

Saccharin is now used as an artificial sweetener. It has no caloriesbecause it has no food energy. Saccharin has been used to sweetensuch things as drinks, candies, medicines, and toothpaste. During theFirst World War, a sugar shortage prompted widespread use of thisproduct. If Fahlberg had used proper hygiene, we might never haveenjoyed the many sweet, calorie-free saccharin products on themarket today.

Accidental Discoveries: Saccharin

Questions

1. What material was Fahlberg testing in his lab at Johns HopkinsUniversity?

2. What did he eat that tasted sweeter than usual?

A. potatoesB. cakeC. cornD. rolls

3. Why did Fahlberg still have coal tar residue on his hands?

A. He forgot to wash his hands.B. He couldn't wash it off.C. He shoveled coal tar into the furnace before dinner.D. He washed his hands with coal tar.

4. What did Fahlberg name his sweet discovery?

A. coal syrupB. saccharinC. sweet spotD. sugar pie

Fahlberg made his accidental discovery because he forgot to wash hishands. Even though he made this important discovery, why do youthink it is more important than ever to wash your hands beforehandling food today?