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20 Cards in this Set

  • Front
  • Back
What kind of change is burning?
When a substance undergoes a chemical change...
a chemical reaction is said to take place.
In order to understand chemical reactions..
one must first be able to describe them
When charcoal burns, the carbon in the charcoal reacts with ..
oxygen in the air to produce carbon dioxide and heat.
in a chemical reaction, the substances that undergo chemical change.
New substances formed as a result of a chemical reaction.
Summarize reactions
Reactants ---------> Products

Carbon + Oxysten yields Cabrons dioxide
C + O2 ----> CO2
Chemical Equation
representation of a chemcial reactions in which the reactants and products are expressed as formulas.
Established Principle that the mass of products is always = to mass of reactants
French chemist Antoine Lavosier
The law of conservation of mass states that
mass is neither created nor destroyed in a chemical reaction
To balance a chemical equation, first..
count the atoms on each side of the equation
Because chemical reactions often involve large numbers of small particles...
chemists use a counting unit called the mole to measure amounts of a substance
An amount of a susbtance that contains approx. 6.02 x 10(23)<--(exponent) particles of that substance.
Moles is aka...
Avogadro's number
Molar mass
The mass of one mole of a substance
Element molar mass
same as its atomic mass expressed in grams
Molar mass for a compound
Add up atomic masses of its component atoms, and express the sum in grams
Once you know the molar mass of a substance you can convert...
moles of that substance into mass, or a mass of that substance into moles.
In chemcial reactions, the mass of a reactant or product can be calculatd by..
using a balanced chemical equation and molar masses of the reactants and products