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Week 13
Oxidation Numbers, Writing Chemical Formulas
17
Science
9th Grade
02/18/2013

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Term
Oxidation Number
Definition
Tells the number of electrons an atom gained or lost when forming the compound.

It is seen as a superscript to the right of an element symbol (e.g., FeIII) or in parentheses after the element name [e.g., Fe(III)] usually with no space between the element name and the parentheses.
Term
Chemical Formula
Definition
An expression which states the number and type of atoms present in a molecule of a substance
Term
Polyatomic Ions
Definition
an ion comprised of two or more atoms.
Term
Binary Compounds
Definition
A compound made up of two elements.
Term
Subcripts
Definition
Small numbers to the lower right of the chemical symbol, representing the number of atoms of that element present in the compound.
Term
Chemical equation
Definition
An expression that uses chemical symbols to represent a chemical reaction.
Term
reactants
Definition
The substances that undergo a chemical reaction.
Term
product
Definition
The new substances produced by a chemical reaction.
Term
coefficients
Definition
A number placed in front of a term in a chemical equation to indicate how many molecules (or atoms) take part in the reaction.
Term
combination reaction
Definition
A chemical reaction in which two substances combine to form a new compound.
Term
decomposition reaction
Definition
A chemical reaction in which a compound breaks down to form simpler substances.
Term
electrolysis
Definition
Producing a chemical reaction by means of electricity.
Term
single-replacement reaction
Definition
A chemical reaction in which one element in a compound is replaced by another element.
Term
double-replacement reaction
Definition
A chemical reaction in which two compounds swap ingredients, forming two new compounds.
Term
precipitate
Definition
The name given to the solid that is formed as a result of a precipitation reaction.
Term
endothermic reaction
Definition
A chemical reaction that absorbs heat, causing the products to be colder than the reactants.
Term
exothermic reaction
Definition
A chemical reaction which generates heat.
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