Manual do professor

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Manual do professor

1. Read about some accidental inventions, according to a website. Then use this information to complete the statements. Write your answers in your notebook.

I. Saccharin, the sweetener, was discovered because chemist Constantin Fahlberg didn’t wash his hands after a day at the office.

Adapted from . Accessed on April 26, 2016.

II. The first potato chip appeared because George Crum was fed up with the complaints of a customer who kept sending his French fries back to the kitchen because they were too thick and soggy. Crum decided to slice the potatoes so thin that they couldn’t be eaten with a fork.

III. An 11 year old, Frank Epperson invented the popsicle in 1905 when he left a mixture of powdered soda and water out on the porch, which contained a stir stick, in a cold night.

IV. The inventors of corn flakes left a pot of boiled grain on the stove for several days. The mixture turned moldy but the product that emerged was dry and thick. Through experimentation they eliminated the mold part and created corn flakes.

V. Wilhelm Röntgen, an eccentric physicist, discovered the X-rays when he was investigating the properties of cathodic ray tubes. When shining light through the tubes, he noted that some fluorescent papers in his lab were illuminated even though his machine had an opaque cover.

Adapted from . Accessed on April 26, 2016.

a) Saccharin 1 by chemist 2.

b) The potato chip 1 by George Crum because one of his 2 kept sending soggy 3 back to the kitchen.

c) Popsicles 1 by 2 after he had left a drink outside in the cold.

d) Corn flakes 1 because of boiled grains left on the stove.

e) The X-ray 1 by an 2 who was interested in cathodic ray tubes.

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