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Chapter 2
Chemical Reactions and Matter
26
Chemistry
9th Grade
01/14/2008

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Term
traits
Definition
characteristics of living organisms
Term
properties
Definition
characteristics of nonliving objects
Term
physical properties
Definition
properties that can be seen or measured using the five senses
Term
chemical properties
Definition
describe how substances react with other substances
Term
physical change
Definition
changes that do not create new substances
Term
chemical change
Definition
changes that do create new substances
Term
electrolysis
Definition
chemical change resulting from an electrical current passing through water
Term
reactants
Definition
substances that change
Term
products
Definition
substances that the reactants change into
Term
yieldsign
Definition
points to the products
Term
coefficient
Definition
tells the number of molecules of the compound (comes in front of the compound)
Term
subscript
Definition
tells the number of atoms of the element (below and after the element)
Term
three classes of matter
Definition
1. element
2. mixture
3. compound
Term
element
Definition
a substance that can't be broken into simpler substances by chemical means
Term
mixture
Definition
2 or more substances that have not been chemically combined (bonded) - the substances can be physically seperated
Term
compound
Definition
2 or more substances that have been chemically combined (bonded) - these can only be seperated by chemical means
Term
molecule
Definition
smallest part of a compound
Term
atom
Definition
smallest part of an atom
Term
chemical symbol
Definition
shorthand way of writing the names of the elements
Term
chemical formulas
Definition
tells the kind and number of atoms found in a compound
Term
chemical equation
Definition
shows what takes place in a chemical reaction
Term
word equation
Definition
chemical equation using the names of the elements/compounds/radicals
Term
Laws of Nature
Definition
1. Law of Constant Proportions
2. Law of Conservation of Matter
Term
Law of Constant Proportion
Definition
every compound always has the same number (proportions) of the elements of which it is formed
Term
Law of Conservation of Matter
Definition
in chemical changes, matter is neither created or destroyed; it just changes forms
Term
precipitate
Definition
a solid that falls out of a solution
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