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| the stuff of the universe |
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| anything that has mass and takes up space |
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| measurement that reflects the amount of matter |
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| a measure of not only the amount of matter but also the effect of earths gravitational pull |
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| Weight isnt always the same everywhere on earth. |
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| It actually becomes less as you move away from Earths surface at sea level. |
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| Much of matter and its behavior is Macroscopic. |
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| made up of particles called atoms |
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| a visual, verbal, or mathematical explanation of experimental data. |
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| the study of matter and the changes it undergoes |
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study of the structure and properties of matter
known as central science
-heat, enery, radio waves(not matter) |
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| Mass does not vary with location |
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you use a balance to measure
units-kg,g,mg. |
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uses a scale to measure
units-newtons, pounds |
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a systematic approach used in scientific study
organized process for research |
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| steps to scientific method |
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Definition
1.Problem-a question you want answered
2.observation-the act of gathering info-may be qualitative or quantitative
3.hypothesis-tentative explanation for an observation
4. Procedure-set of controlled observations that test the hypothesis(procedure used to collect data and must test one variable at a time)
5. Conclusion-tells whether the experiment supports your hypothesis or if your hypothesis needs to be revised |
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| the factor adjusted by the person doing the experiment |
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| factor that changed because the person doing the experiment changed the independent variable |
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| factor that stays the same throughout the entire experiment |
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| group that undergoes the experiment or is tested |
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| the group that is used for comparison |
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| an explanation that has been supported by numerous experiments;broad principal of nature that has been supportes over time, and is subject to change |
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| relationship in nature that is supported by many experiments:considered to be fact |
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| gaining knowledge for the sake of knowledge |
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| reasearch undertaken to solve a specific problem |
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| the practical use of scientific info used to improve human life and the world around us |
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| two substances that harm ozone and contain bromine |
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| carbon tetrachloride and methyl cloroform |
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| made of oxygen, a substance in the atmosphere that absorbs most harmful radiation before it reaches earths surface |
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| matter that has a definite and uniform composition |
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| 90% of earths ozone is spread out in a alyer that protects our planet |
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| lowest layer of atmosphere... |
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| contains the air we breathe:also where clouds occur and airplanes fly: all weather occurs here |
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| second layer of atmosphere... |
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| extends from 10 to 50 kilos; ozone layer is located here |
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| when oxygen gas is exposed to the ultraviolet radiation in the upper regions of the stratosphere, ozone is formed |
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| ozone was first identified and measured in... |
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| British scientist G.M.B. Dobson began measuring the amount of ozone in the atmosphere |
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substance that consists of chlorine, flourine, and carbon.
man-made, discovered by Thomas Midgely, nontoxic, stable, coolants, do not react with anything |
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| scientists noticed that the number of CFC's increased |
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| made the connection and hypothesized that CFC's break down in the stratosphere due to interactinbg with the UV light from the sun. Then the chlrine particle produced by this interaction breaks down the ozone, therefore the ozone in the stratosphere is destroyed by CFC's |
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| you do not need a microscope to observe it |
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| data expressed using numbers |
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| data expressed using the 5 senses |
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