Flashcard Set Preview
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| 1 |
chemistry
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the study of composition and reaction of substances.
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| 2 |
two types of matter?
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pure substance and mixture
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what are two pure substances?
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element and compound
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what are two mixtures?
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heterogeneous and homogenous
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element
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a substance whoes smallest particles are the same
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what four elements make up 96% of the human body?
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hydrogen, oxygen, carbon and nitrogen
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compound
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a pure substance that contains more then one element and has a fixed composition.
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mixtures
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a combination of two or more substances in which the substances retain there chemical formula
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homogeneous mixture
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compositions is the same throughout
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heterogenous mixtures
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composition varies throughout
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chromotography
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the process of seperation substances in a mixture
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volume
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amount of space an object takes up
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| 13 |
all non zero numbers are signifigant
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fun fact
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zeros between non zeros are signifiganti.e. (204.2)
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fun fact
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zeros beyond the decmil point are signifigant(i.e. 24.00)
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fun fact
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zeros proceding the first non zero are not signifigant.(i.e. 00.004 only has one significant...
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fun fact
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conversion factor
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alows you to convert one set of units to another
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chemical properties
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properties observed when a substance takes part in a chemical reaction.
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physical properties
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properties without changing its color, shape, volume or mass
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Density
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ratio for mass to volume
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solubility
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how easy a substance disolves into another
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| 22 |
color
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the absorption of certain compounets of visable light
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| 23 |
what are the three building blocks of matter?
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ions, molecules and atoms
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| 24 |
atom
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the smallest particle of an element that retains the chemical properties of an element
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| 25 |
law of conservation of mass
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there is no change in mass in an ordinary chemical reaction
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law of constant composition
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a compound always contains the same elements in the same ratio by mass
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law of multiple proportions
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the masses of one element that combine with a fixed mass of the second element are in a ratio...
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atomic number
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number of protons
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mass number
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number of protons and neutrons
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isotopes
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same number of protons but a diffrent number of neutrons
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| 31 |
structual formulas
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show bonding patterns
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molecular formula
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shows number and types of atoms in a compound
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cation
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positive charged ion
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| 34 |
anion
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negative charges ion
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