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Ch. 20 sec. 2

Terms in this set (32)

cut, tear, grind, or bind matter
whenever you _______________________ you are causing a physical change
the sugar dissolves
what happens to sugar when you put it in tea
physical
matter changing from one state to another is a ________ change
melting
The opposite freezing is ________.
condensation
The opposite of vaporization is _________.
deposition
The opposite of sublimitation is __________
A reddish powdery substance
what is rust???
when iron in steel is exposed to oxygen and water in the air iron and oxygen atoms form the principal called rust
how does rust form??
Chemical change differs from physical change because it completely changes the substance.
how does Chemical change differ from physical change?
chemicals in leaves that
give them their color
pigments
because in the summer the chlorophyll is large enough to mask the color
why do leaves from green to various colors
chemical
the change in food color as it cooks is because of a chemical change.
release, gain
A sign of a chemical change the _____ or _____ of energy by an object.
odor
what is a clue that a chemical change has occurred that can save lives
precepitate
A solid that separate out of a solution during a chemical change
solubility
The amount of a substance that will dissolve in a given amount of another substance
physical change
when the form or appearance changes, but not its composition
vaporization
when a liquid changes into a gas
condensation
when I gas changes into a liquid
sublimitation
a solid changes directly into a gas
deposition
when a gas changes into a solid
Chemical change
substances changed into different substances.
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Chemical, physical
the substances produced during a __________ change cannot be changed back into the original substance by ________ means.
chemical changes the whole thing and physical does not
main point to remember when contrasting physical change and chemical is...
copposition, matter
during a chemical change, the form or the ______ of the _______ changes.
not destroyed and new particles are not created
The particles within the matter rearrange to form new substances, but they are not ____________________________.
same, physical, chemical
The total mass of the matter is the _____ before and after the _______ or________ change.
Antoine Lavoisier
scientist who first performed it be careful experiments necessary to prove that mass is converted
that the mass of gases that are given off and taken from the air during a chemical change account for any differences in mass.
what did Lavoisier recognize?
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