vocab
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Temperature | measurement of kinetic energy of atoms or molecules(degrees)
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| Absolute Zero | when all motion of atoms stop
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| Accuracy | how close a measured value is to the accepted value or target
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| Precision | how close a series of measurements
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| Percent Error | ratio of error to the accepted value
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| Percent Error(formula) | % error= [(experimental-accepted)/excepted]x100
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| Matter | takes up space and has mass
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| Weight | measurement of matter and gravity (pounds)
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| Scientific Method(order) | 1. observation
2. hypothesis
3. experiment
4. theory
5. law
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| Observation | use of the senses
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| Quantitative | numeric
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| Qualitative | qualities
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| Hypothesis | testable prediction/statement
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| Experiment | used to test a hypothesis
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| Independent Value | what you change
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| Dependent Value | changes in response to independent value
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| Controlled Variable | standard in he experiment
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| Theory | describes why things happen
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| Law | describes how/what things happen, a fact of nature
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| Base Units | defined unit of measurement that's based on an object or event in the physical world
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| Derived Units | combination of base units
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| Scientific Notation | convenient way of writing very small or large #s
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| Density | measure of how packed an object is
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| Density(formula) | D=M/V
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| Substance | matter that has a uniform unchanging composition
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| Element | substance that cannot be separated into simpler substance
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| Compound | combination of 2+ elements, chemically combined
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| Mixture | combination of substances
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| Heterogeneous | not uniform mixture
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| Homogeneous | uniform mixture, constant composition
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| Physical Properties | characteristics that can be observed or measured w/out changing the sample's composition
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| Intensive Properties | independent of the amount of substance presnt
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| Chemical Properties | ability of a substance to combine w/or change into 1+ substances
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| Flamability | ability to burn
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| Reactivity | how easily a substance combines chemically with other substances
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| Solid | Particles- close, orderly
Shape- fixed
Volume- fixed
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| Liquid | Particles- loose, random
Shape- changes
Volume- fixed
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| Gas | Particles- fast, random, spaced out
Shape- changes
Volume- Changes
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| Plasma | ionized gas w/enough energy to have free electrons
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| Physical Changes | altering a substance w/out changing its composition
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| Chemical Changes | process where 1+ substance changes into a new substance
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| Evidence of a chemical reaction? | -gas produced
-color change
-change in smell
-light produced
-temp change
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| Law of Conservation of Mass | mass is neither created nor destroyed
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| Filtration | separation based on particle size
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| Distillation | separation based on boiling points
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| Crystallization | formation of solid particles from a solution
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| Chromatography | separation based on particle size
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