SNC1D Grade Nine Science The Elements – Movie Answer Sheet “The Elements” is an interesting and somewhat unique description of chemistry an the attempts of scientists to classify the known elements over the years. The presentation style is „a bit weird‟ as some grade nine students have observed in the past, but the information is all very good. Questions 1 through 5 should be attempted as you watch the video. Question 6 can be left for homework
1.
Why is did experimentation replace philosophical reasoning and observation when establishing scientific theories (i.e. alchemists vs. modern day scientists)?
2.
What determines how chemical compounds behave?
3.
Of the 11 million compounds known, 10 million contain carbon. What are the implications of this fact?
4.
What may happen when our reserve of tungsten dwindle (run low)? How can we conserve tungsten?
5.
Suggest why or why not an element that is made by scientists in a linear accelerator by the collision of high speed particles (and as such exists for only a fraction of a second) should be considered an element.
Docstoc, Inc. 6. Using your laptop and the internet, summarize the major characteristics of the following elements. In your summary you should include such things as… relative abundance on the earth, uses and/or hazards, who discovered it, why it is important to mankind… that sort of thing. Some elements will not have an answer to all of the questions, for instance no one know who discovered gold. I have done hydrogen for you as an example, some useful places to start would be Wikioedia, Encarta, or a website like http://www.webelements.com/ 1. Hydrogen: - lightest of all known elements - discovered in 1766 by Henry Cavendish in London England - combines with oxygen to form water - is used in rocket fuel and fertilizer - is the most abundant element in the universe (over 90% of all atoms are hydrogen)
2. calcium
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3. oxygen
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4. phosphorus
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5. lithium
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