Chemistry - Chemical Reactions and equations
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what is a chemical reaction?
a process in which one or more substances are converted into new substances with different physical and chemical properties.
ex: a raw egg -> cooked egg
do chemical reactions share certain characteristics?
what two types of substances need to be involved in a chemical reaction?
- 1.) those present before the chemical reaction
- 2.) those created by the chemical reaction
what is a reactant
a substance that enters into a chemical reaction
what is a product?
a subtance that is produced by a chemical reaction
what determines wherther an atom will bond with other atoms and witch which atoms it will bond to?
which atoms will bond and which atoms will not?
complete set of valance electrons will not bond with other atoms and vice versa.
what happens through a chemical reaction?
an atom will have an opportunity to obtain a complete set of valence electrons and become more stable
what can atoms form during a chemical reaction?
molecules which can break apart to form atoms and molecules and react with other molecules
how are chemical reactions represented - sentence wise?
what is a chemical equation?
describes what happens in a chemical reaction
what are the four general types of chemical reactions?
- -direct combination
what is direct combination reactions?
- two or more reactants come together to form a single product.
- a.k.a. synthesis reactions
what is the general form of direct combination reactions?
A + B --> AB
- calcium + oxygen --> calcium oxide
what is decomposition reaction
a reaction in which a cingle compound is broken down into two or more smaller compounds or elements.
what is the general form for a decomposition reaction?
AB --> A + B
- water --> 2 parts hydrogen + 2 parts oxygen
what is single replacement reaction?
an uncombines element displaces an element that is part of a compound.
what is the general form for a single replacement reaction?
A + BX --> AX + B
- Mg + CuSO4 --> MgSO4 + Cu
what is double replacement reaction?
atoms or ions from two different compounds replace each other.
what is the general form for double replacement reactions
AX + BY --> AY + BX
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