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23 Cards in this Set

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  • Back
What is Chemistry?
the study of matter and the changes that it undergoes.
What is matter?
anything that has mass and volume.
The four states of matter are...
solid, liquid, gas, plasma
gas -> solid is called
desposition
solid -> gas is called
sublimation
gas -> liquid is called
condensation
liquid -> gas is called
vaporization
3 properties of solids
particles are arranged so particles are closely packed, definite shape and volume, cannot be compressed
3 properties of liquids
particles are arranged so they can slide past eachother takes the shape of the container and definite volume, cannot be compressed
3 properties of gas
particles are spread out widely, no definite shape or volume, very compressible
a molecule is
2 or more chemically bonded atoms
matter that has a fixed composition and distinct properties is called
a substance
a combination of 2 or more substances, each of which retains its properties is called
a mixture
True or False: compoiunds can be decomposed into simpler substances.
true
Physical properties are
properties that can be observed without changing the identity and composition of the matter.
Chemical properties are
properties that describe the way a substance may change to react to form other substances.
Properties that are independent of sample size are called
intensive properties
Properties that depend on sample size are called
extensive properties (ex. mass, volume)
Define homogeneous mixtures
uniform throughout. Also called solutions.
Define heterogeneous mixtures
non-uniform throughout.
Filtration
the mixture is separated based on differences in particle size
Distillation
separates components based on differences in boiling points.
chromatography
separates mixture components based on differences in atraction to a surface.