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chem popquiz (22-24)

QuestionAnswer
Democritus Greek scholar that proposed that matter consists of tiny particles; thought particles of water were smooth and round, particles of iron were rough and jagged
atomos "indivisible" "uncut"what Democritus called the particles that make up matter
John Dalton proposed a more extensive model of the atom
differences in the atoms of the elements. 4) The atoms of the elements combined in a compound are combined in a definite ratio. 5) A chemical reaction is the result of rearrangement, combination, or separation of atoms. ATOMIC THEORY 1) Every element consists of tiny, indivisible, indestructible particles called atom. 2) All of the atoms of a particular element have the same size, mass, and chemical behavior. 3) Differences in properties of elements result from
chemical reaction result of rearrangement, combination, or separation of atoms
no is Dalton's atomic theory completely accurate?
law of definite composition first basic law explained by Dalton's theory; ratios of the masses of each element in a given compound are always the same
a compound always has the same composition and the same properties no matter what law of definite composition restated
law of multiple proportions when two elements can combine to form more than one compound, the masses of one element that combine with a fixed amount of the other element are in a ratio of small whole numbers
properties how to describe, identify, or distinguish a matter
physical properties can be measured without changing the identity/composition of the substance
color, odor, density, hardness, solubility, taste, state, boiling point, melting point examples of physical properties
chemical properties describe how matter reacts to change into other chemically different substances having different properties
chemical properties can only be determined through chemical reactions, which change the identity of the substance
physical changes changes in the physical appearance of matter that do not change the identity or chemical composition of a substance
state, shape, phase examples of physical changes
physical processes physical changes may often be reversed by what
chemical change a change in which a substance becomes a different substance with a different composition and properties
sodium chloride major example of chemical change
other chemical changes chemical changes can be reversed only by
formation of a gas or precipitate liberation/absorption of heat, light, etc (energy) a distinct change in color number of observations that suggest a chemical change has occurred
Precipitate An insoluble substance
Created by: tatianaprince