Unit: Chemical Reactions

Types of Chemical Reactions: Double Replacement and Combustion

Day 6 - Notes

Day 6 - Notes

After today you will be able to…

• Identify a double replacement and combustion reaction

• Predict the products in words for single replacement reactions

• Predict the products in formulas for a combustion reaction

• Balance combustion reactions

Predicting Products

4. Double Replacement: Two compounds react to form two new compoundsCommon form:Compound + Compound Compound

+CompoundAB + CD AD + CB

Examples of double replacements:

copper (I) + beryllium sulfate oxalate

copper (I) + beryllium oxalate sulfate

Do not use the activity series for these reactions!

Examples of double replacements:

A neutralization reaction is a type of double replacement reaction.

Neutralization reaction: Is a reaction between an acid and a base (base – a metal hydroxide, ex: NaOH)

Example of a neutralization:

Neutralization reactions are a special type of double replacement between an acid and a base that produces Salt (ionic compound) plus water).

aluminum nitric hydroxide + acid

aluminum + water nitrate

Water will always be a product!

hydrogen nitrate

Predicting Products

5. Combustion: A reaction with oxygen (O2)If your reactant

contains:The product will

be:

C CO2

H H2O

S SO2

N N2

Examples: Predict the products and balance.

___ CH4 + ___O2 CH

14

12

2 2

4

___CO2 + ___H2O

O2 3

Tip: Balance the O2 last.

4 4

Examples: Predict the products and balance.

___H3N + ___O2 HN

31

22

2 36

+ ___N2

___H2O

O2 1

Tip: Put the ideal decimal coefficient, then double all coefficients to

balance!

6

32

1.54 3 6 2

12 124 46 6