Watch the video and answer the following questions.
PAY ATTENTION TO THE USE OF PREPOSITIONS LIKE: upon, with, on, in, of, from, to, across etc.
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Elements like gold, silver, and ___ were easily spotted by ancient cultures, and were used for multiple purposes like ___ and tools.
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The corner pieces are ___ of a puzzle, are generally the easiest to find and place because they stand out with their ___ edges, and clearly don’t ___ with other puzzle pieces. Like puzzle pieces, elements can be choosy on who they interact with. Some like to react with other elements, while others do not. The elements that do not interact with other elements are easy to ___, while the ones who like to interact with others are difficult to find. Gold, silver, and copper are some of the choosier elements so we can find them easier.
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Like many other alchemists of his time, Brand was trying to ___ gold ___ the human body. Brand hit ___ what he thought was the most obvious answer ___ his problem: __. Urine is gold in coloration and could __ have gold in it. So, Brand collected as much urine as he possibly could, much of it being his own, then he decided to boil it down_____ ___ _____ obtaining gold.
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So Brand boiled his, well, urine, down until he collected a_____ and heated the paste to a very high temperature. Eventually smoke ___ and the material burned brightly and violently. Brand had unknowingly ___ phosphorous _____ his urine.
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Instead, ancient Greek principles of objects being ___ ___ earth, water, air, and fire were ___ .
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Who is now known as the father of chemistry? ______.
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Who defined what an element was? ______.
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What is an element?
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German chemist Wolfgang Döbereiner later ___ elements to see how they reacted with one another. What he found was that certain elements shared similar ___ and __. For example, when pure lithium, sodium, and potassium __ ___ ___ water, they will react violently and ___ ___ the surface of the water with sparks. The scientists then realised that these similarities are no ___: elements belong to families that share similar properties.
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Dmitri Mendeleev created cards of each known element and tried to order them based on a_____ ___ and their known _____.
ANSWER SHEET
- Copper, jewellery\
- edges, smooth, interlock, pin-point.\
- extract, from, upon, to, perhaps, in hopes of, urine\
- paste, appeared, isolated, from\
- composed of, predominant\
- Antoine Lavoisier\
- Antoine Lavoisier\
- an element as a substance that cannot be broken down by existing chemical means.\
- combined, properties, reactions, are exposed to, skid across, coincidence\
- automatic weight, properties
