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32 Cards in this Set
- Front
- Back
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what does acid do to your clothes experiment results
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nylon disintegrated
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what is chemistry?
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the study of all substances and the changes they can undergo
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why is it the central science?
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it overlaps so many different sciences
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How can a knowledge of chemistry help a wetlands ecologist or an archaeologist do her job?
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A wetland ecologist uses chemicals to test the levels of oils and other pollutants in the swampy waters; an archaeologist uses chemicals to test and preserve old artifacts
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Suppose you know a hair stylist who tells you that in his profession he has no need to understand chemistry. What arguments would you use to convince him that he is mistaken?
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There are chemicals in every kind of hair dye, spray, relaxer, wave solution, etc. that he uses
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scientific method
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way of answering questions about the world we live in
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steps of method
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make an observation
form a hypothesis perform an experiment interpret the result, conclusion natural law theory |
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variable
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the factor being tested in an experiment
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experimental control
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responds in a predictable way to the experiment
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natural law vs theory
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how nature behaves vs why nature behaves
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explain how a steel wool soap pad eventually becomes rusty after you use it several times
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??
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10 basic safety rules
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follow directions
tell teacher of problems know how to use equipment wear goggles tie back hair avoid awkward transfers let hot things cool carry chems with caution dispose of wastes clean up |
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why is it important to tie back hair and sleeves
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can drag in chemicals, catch on fire, knock over things
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how could you apply basic safety rules to baking a cake
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danger of fire, no raw materials, clean up, tie hair
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metric system
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international units of measurement
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international system of units
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si units, 7 basic metric base units
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si length
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meter
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si mass
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kilogram
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si volume
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cubic meter
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mass vs weight
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amount of object's material vs force of gravity pulling the object
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volume
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amount of space object requires
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metric prefix
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word attached to the base to change the meaning
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centi
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one one hundredth
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deci
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one tenth
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kilo
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one thousand
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milli
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one one thousandth
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base unit vs derived unit
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base is one of 7 basic SI units vs derived is a combo of base units
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base unit ex vs derived unit ex
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meter vs square meter
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why are measurements always uncertain
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measuring instruments are never completely free of flaws and measuring always involves estimation
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2 ways to check reliability of measurement
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precision, repeat; accuracy, accurate measurment
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how would you find the uncertain digit in a measurement using a digital display vs scale
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use the reading it prefers vs 10 more devisions, estimate
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different dartboard analogy
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bball - hitting the spot on the board you want to vs making the goal every time in different ways
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