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33 Cards in this Set
- Front
- Back
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What is Chemistry?
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the study of matter and its properties and transformations
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4 examples of where chemistry is used
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-Medical field- drugs/sterilization
-Forensics-id unknowns -Agriculture-pesticides, vet sciences -Food Industry |
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The periodic table allows you to make predictions about...
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size and chemical reactivity
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Metals
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-Solids at room temp...except Murcury
-Can conduct both heat and electricity -Very high melting points |
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Nonmetals
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-May be solid, liquid, ore gas at room temp
-Poor conductors of heat and electricity -Lower melting points than metals |
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Metalloids
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A gradual change in properties
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Compound
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Two or more elements that are chemically bonded
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Matter
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Anything that has mass and occupies space
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Solid
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-particles are very tightly paced in an orderly arrangement
-do not "flow", constant volume and shape -not compressible |
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Liquid
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-particles are still close together, but not as close as in solids
-can "flow", have constant volume, but not shape -slightly compressible |
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Gas
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-very large distances between particles
-no constant volume or shape -very compressible |
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Pure substance
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any form of matter that has a uniform composition and cannot be seperated by physical means
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Element
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simplest form of a pure substance
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Atom
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smallest unit of an element
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Compound
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Two or more elements that are chemically bonded together
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Molecule
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smallest unit of a compound
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Mixtures
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two or more pure substances mixed together, but not chemically bonded; they may be seperated by physical means
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Homogeneous Mixture
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substances are so evenly distributed that the sample is uniformed throughout
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Heterogeneous Mixture
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composition varies from one region to another (salsa)
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Chemical Properties
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-describes how the substance reacts with other substances
-explosive? flamable? |
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Chemical Change
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what occurs when a substance reacts with something else
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Physical Properties
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-can be observed without adding another substance
-color, taste, melting point |
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Physical Change
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transformed but it's identity is NOT altered
-melting point (mp) -bolining point (bp) -sublimation |
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Accuracy vs Percision
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How close to the numbers vs how repeatable measurements are
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Mass
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a measure of the quantity of matther in a sample, does not depend on gravity
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Weight
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the response of matter to gravity, depends on the mass and gravitational force
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Mega (M)
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1,000,000
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Kilo (k)
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1,000
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Deci (d)
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.1
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Centi (c)
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.01
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Milli (m)
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.001
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Micro ( )
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.000001
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Density Formulas
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d=m/v
v=m/d m=vxd |
