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28 Cards in this Set
- Front
- Back
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Chemistry (defn.)
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the science of matter and its tranformations from one form to another
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matter (defn)
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anything that has mass and occupies space
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hypothesis (defn)
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an idea that is tentaively proposed as an explanation for some observation and provides a basis for experimentation
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qualitative data...
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does not involve numbers
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quantitaive data...
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reports numbers
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a scientific law is...
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a statement that summarizes and explains a wide range of experimental results and hasnot been contraditcted by experiments
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Can a scientific law be disproved or falsified?
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Yes, by new experiments.
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theory (defn)
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a unifying principle that explains a body of facts and the laws based on them
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a model...
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makes a theory more concrete
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physical properties are...
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observed and measured w/o changing a substance's composition
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physical change (defn)
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same substance is present w/this change, but physical state or size may change
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energy transfers from what temperature to what temperature
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high temp to low temp
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density =
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mass/volume
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chemical properties describe
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the kinds of chemical reactions the substance can undergo
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energy is defined as
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the capacity to do work
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Can energy supplied from somewhere else can chemical reactions to occur?
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Yes
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Homogenous
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completely uniform
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Heterogeneous
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not completely uniform
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pure substance
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one from which all other substances have been seperated
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decomposition
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making a mixture into simpler substances thorugh chemical reactions
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chemical compounds
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can be decomposed
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elements
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can't be broken down any further
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two differences between a compounds and a mixtureL
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1. compounds has specific composition
2. compound has specific properties |
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is it possible to seperate homogenous mixtures?
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yes, using physical means
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macroscale
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large enough ot be seen, measured, handled
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microscale
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must be viewed using a microscope
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nanoscale
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1 million X smaller than something else
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why is matter the way it is?
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b/c of hte nature of its constituent atoms and molecules
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