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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

Chapter 8 notes part i


How many elements are in a compound


How many substances are in the reaction

2H2 + O2a2H2O

Chapter 8 notes part i

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


Double replacement

Al(OH)3 + 3NaCl aAlCl3 + 3NaOH

Double replacement


CH4 + 2O2a CO2 + 2H2O



KClO2a KCl + O2


Double replacement1

NaOH + HCl a NaCl + H2O

Double replacement


4Fe + 3O2a 2Fe2O3



2C2H2 + 5O2a 4CO2 + 2H2O



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


Ba cn 2 h 2 so 4 a baso 4 hcn

Ba(CN)2 + H2SO4a BaSO4 + HCN

Double replacement

C 3 h 8 5o 2 a 3co 2 4h 2 o

C3H8 + 5O2a 3CO2 + 4H2O


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


C 2 h 2 o 2 a co 2 h 2 o

C2H2 + O2a CO2 + H2O


2hbr a h 2 br 2

2HBr a H2 + Br2


Crso 4 2agno 3 a cr no 3 2 ag 2 so 4

CrSO4 + 2AgNO3a Cr(NO3)2 + Ag2SO4

Double replacement