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Describing Chemical Reactions

Chemistry Book: Chemical Recations Chapter 2, Section 2
by

Anne DaLuga

on 1 March 2015

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Transcript of Describing Chemical Reactions

Describing Chemical Reactions
Chemical Equation: a short easy way to show a chemical reaction

using

symbols

instead

of

words
Formulas are like recipes for compounds
reactants: substances at the beginning

products: substances at the end
Structure:

reactant + reactant --> product + product
Conservation of Mass:
matter is not created or destroyed
Law of conservation of mass also means...
All the atoms present at the beginning are present at the end
Total mass of reactants = Total mass of products
Open system - matter can enter or escape
Closed system - matter is not allowed to enter or leave
reactants react
products are produced
1. Write the Equation
2. Count the Atoms
3. Use Coefficients to Balance Atoms
4. Look Back and Check
Go to PowerPoint for Classifying Chemical Reactions
chemical equations use chemical formulas to represent the substances involved
(--> or arrow means "yields")
A chemical equation must show the same number of each type of atom on BOTH sides of the equation.
Coefficient: number placed in front of a chemical formula

in a chemical equation

It tells you how many atoms or molecules take part in the reaction

#7 - Circle all the elements and compounds before the arrow
#8 - Circle all the elements and compounds after the arrow
reactants: substances at the beginning

products: substances at the end
Full transcript