chemical reactions unit 7 1. chemical equations 2 feo 2 (s) + 2 h 2 (g) fe (s) + 2 h 2 o (l) nacl...
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Chemical Reactions
Unit 7
1
Chemical Equations
2
FeO2 (s) + 2 H2(g) Fe (s) + 2 H2O (l)
NaCl (aq) + AgNO3 (aq) AgCl (s) + NaNO3 (aq)
Symbol Found in Chemical Equation Physical Meaning
Produces - equivalent to an equal sign in
an algebraic expression
+ Reacts with or is produced with
(s) Compound is a solid
(l) Compound is a liquid
(g) Compound is a gas
(aq) Compound is aqueous (dissolved in water
Reactants Products
Chemical Equations
3
A chemical equation is a representation for a chemical reaction that uses chemical symbols and chemical formulas instead of words to describe the change that occurs
in a chemical reaction.
2 Mg + O2 MgOMg + Cl2 MgCl2
Reactants Products
Conservation of Matter!Remember that atoms cannot be created or destroyed!
Balancing Chemical Equations
4
CH4 + O2 CO2 + H2OFe3O4 + H2 Fe + H2O
Ca + N2 Ca3N2
C4H10 + O2 CO2 + H2O
NH4NO3 N2 + O2 + H2O
Remember that atoms cannot be created or destroyed!
SCl2 + NaF SF4 + S2Cl2 + NaCl
Chemical Equations
5
Synthesis ReactionsA single product is produced from 2 or more reactants
X + Y Z
SO3 + H2O H2SO4
Decomposition ReactionsA single reactant is converted into 2 or more products
Z X + Y
H2SO4 SO3 + H2O
Chemical Equations
6
Single Replacement ReactionsOne element within a compound is replaced with another element
XY + Z ZY + X
H2SO4 + Mg2+ MgSO4 + 2 H+
Double Replacement Reactions2 compounds switch parts with each other to form two new compounds
AB + XY AX + BY
MgSO4 + CaCO3 CaSO4 + MgCO3
Combustion ReactionsA substance reacts with O2 (typically with the help of a flame)
2 C4H10 + 13 O2 8 CO2 + 10 H2O
Chemical Equations
7
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