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Chapter 8 Notes, Part I. Parts of an equation Types of reactions. What is a chemical reaction?. A chemical reaction is the act of changing substances into new substances with new and different chemical and physical properties. A Chemical Equation.

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chapter 8 notes part i

Chapter 8 Notes, Part I

Parts of an equation

Types of reactions

what is a chemical reaction
What is a chemical reaction?
  • A chemical reaction is the act of changing substances into new substances with new and different chemical and physical properties.
a chemical equation
A Chemical Equation
  • A chemical equation shows what is going on in a chemical reaction.
  • Instead of writing down the entire sentence “hydrogen reacts with oxygen to form dihydrogen monoxide (water)”, you could write…
2h 2 o 2 a 2h 2 o


The substances you have before a chemical reaction occurs

(found on the left side of the equation)


The substances you have after a chemical reaction occurs

(found on the right side of the equation)

2H2 + O2a2H2O


How many elements are in a compound


How many substances are in the reaction

2H2 + O2a2H2O


2H2 + O2a2H2O

The arrow reads as “produces”, “yields” or “reacts to form”

other symbols in an equation
Other symbols in an Equation
  • (s) = substance is solid
  • (l) = substance is liquid
  • (g) = substance is a gas
  • (aq) = substance is dissolved in water
  • D = heat
other symbols in an equation1
Other symbols in an Equation
  • (A formula written above or below an arrow means it is a catalyst (a substance that speeds up a reaction without being used up by it.)
what is
What is:
  • The name of something that speeds a reaction, but is not used up?
  • The name of what you have before a reaction takes place?
  • The symbol for heat?
  • The number that shows there are more than one of the entire compound?
types of reactions
Types of reactions
  • There are five types of reactions
    • Combination
    • Decomposition
    • Single replacement
    • Double replacement
    • Combustion
combination reaction
Combination Reaction
  • A combination reaction occurs when two or more elements or compounds combine to form a single substance.
  • It will follow the form A + B a AB
  • Example: Fe + S aFeS
decomposition reaction
Decomposition Reaction
  • A decomposition reaction occurs when one substance breaks down into two or more substances.
  • It will follow the pattern

AB a A + B

  • Example: CaCO3aCaO+CO2
single replacement reaction
Single Replacement Reaction
  • One element replaces another element in a compound.
  • Generally follows the formula:

AB + C a A + BC

  • Example:


double replacement reaction
Double Replacement Reaction
  • The exchange of two positive ions between two reacting compounds, forming two new compounds as a product.
  • Generally follows the formula:

AB + CD a AD + CB

  • Example:


combustion reaction
Combustion Reaction
  • A compound reacts with oxygen to producing energy as heat and light.
  • Most of the time, it is a hydrocarbon reacting with oxygen, and the outcome is always carbon dioxide and water
  • Follows the form: A + O2a CO2 + H2O
  • Example: CH4 + O2a CO2 + 2H2O
what type of reaction is
What type of reaction is:
  • NaCN + H2SO4a 2HCN + Na2SO4
  • Zn + 2HCl a ZnCl2 + H2
  • 2C2H6 + 7O2a 4CO2 + 6H2O
  • 2H2 + O2a 2H2O
on the whiteboards
  • Tell which of the five types of reactions the following are:
2na 2h 2 o a 2naoh h 2

2Na + 2H2O a 2NaOH + H2

Single replacement

fe s a fes

Fe + S a FeS



KClO2a KCl + O2


double replacement1

NaOH + HCl a NaCl + H2O

Double replacement


H2 + Cl2a 2HCl


double replacement2

MgO + 2KF a MgF2 + K2O

Double replacement

single replacement

Na + Al(NO3)3aNaNO3 + Al

Single replacement

2pbo 2 a 2pbo 3o 2

2PbO2a 2PbO + 3O2


4li o 2 a 2li 2 o

4Li + O2a 2Li2O


2ag 2hcl a 2agcl h 2

2Ag + 2HCl a 2AgCl + H2

Single replacement

2h 2 o 2 a 2h 2 o o 2

2H2O2a 2H2O + O2


2hbr a h 2 br 2

2HBr a H2 + Br2