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Chapter 1 - Matter
Transcript of Chapter 1 - Matter
vs. Chemical Anything that takes up space Solid liquid gas matter that can not flow
definite volume definite volume
takes the shape of its container (flows). a substance without definite volume or shape and can flow. Vapor- a substance that is currently a gas, but normally is a liquid or solid at room temperature. melt evaporate condense freeze sublime deposit Physical Properties a property that can be observed and measured without changing the composition.
Examples- color, hardness, density, melting point (m.p.), boiling point (b.p.) Chemical Properties A property of matter that describes a substance’s ability to participate in chemical reaction
Can only be identified by trying to cause a chemical change.
Example: Pg 19 Figure 13. Physical Changes alters a substance without changing its composition
properties remain the same Chemical Change/ Reaction changes the composition of a substance
Undergoes a chemical reaction to form a new substance Indications of Chemical Reaction Energy absorbed or released
(heat and/or light) Gas production (bubbling, fizzing, or odor change) Gas production (bubbling, fizzing, or odor change) Color change Irreversibility- not easily reversed
new substances produced, old substances destroyed. Examples:
dissolving in water
burning a log
grinding spices Physical or Chemical Change? chemical
physical Mixture Pure Substance a particular kind of matter – pure
is uniform (all the same throughout) and has a definite composition
Ex. CO, H2O, N2, O2, Pb Elements Compound Some elements exist as single atoms
Pb, Au, Ag, Na Monoatomic Diatomic some elements exist as two atoms joined together
H2, O2, F2, Br2,N2, Cl2, A molecule is formed when two or more atoms join together chemically
Ex. N2, H2,CO, H2O Molecule simplest kind of matter
cannot be broken down any simpler
all one kind of atom.
Ex. N2, O2, Pb, Au a molecule that contains at least two different elements.
Ex. CO, H2O All compounds are molecules but not all molecules are compounds.
Hydrogen H2, Oxygen O2 - MOLECULE – composed of only ONE element
Water (H2O), carbon dioxide (CO2) and methane (CH4) - COMPOUND - made from more than one element. Physical blend of two or more substances; variable composition Homogeneous
(Solutions) Heterogeneous mixture, not uniform in composition same composition throughout; called “solutions