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B. Physical Change A change in the form of a substance without changing its identity. properties remain the same reversible can be used to separate mixtures EX: dissolving, grinding
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Ch. 2 - Classification of Matter
I. Describing MatterPhysical PropertyPhysical ChangeChemical ChangeChemical Property
MATTER
A. Physical Property
A characteristic of a substance that can be observed without changing its identity.
can be used to separate mixtures
EX: magnetism, density
B. Physical Change
A change in the form of a substance without changing its identity.
properties remain the same
reversible
can be used to separate mixtures
EX: dissolving, grinding
C. Chemical Change
A change in the identity of a substance. properties change irreversible Signs: color change, formation of a
gas/solid, release of light/heat EX: burning, rusting
D. Chemical Property
A characteristic that indicates whether a substance can undergo a specific chemical change.
EX: flammability, reactivity
Ch. 2 - Classification of Matter
II. Composition of MatterMatter FlowchartPure SubstancesMixtures
MATTER
A. Matter Flowchart
MATTERCan it be separated by
physical means?
Homogeneous Mixture
(solution)
Heterogeneous Mixture Compound Element
MIXTURE PURE SUBSTANCE
yes no
Can it be decomposed by chemical means?
noyesIs the composition uniform?
noyes
B. Pure Substances
Element matter composed of identical atoms EX: copper
B. Pure Substances
Compound matter composed of 2 or
more elements in a fixed ratio
properties differ from those of individual elements
EX: salt (NaCl)
C. Mixtures
Variable combination of 2 or more pure substances.
Homogeneous Mixture (Solution) even distribution of components very small particles particles never settle EX: saline solution
C. Mixtures
Heterogeneous Mixture uneven distribution of components colloids and suspensions EX: granite
C. Mixtures
Colloid medium-sized particles Tyndall effect - particles
scatter light (looks cloudy) particles never settle EX: milk
C. Mixtures
Suspension large particles particles scatter light particles will settle
(needs to be shaken) EX: fresh-squeezed
lemonade