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Classifying Chemical Reactions

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Presentation on theme: "Classifying Chemical Reactions"— Presentation transcript:

1 Classifying Chemical Reactions

2  It may seem like there are many different ways that chemicals can react!
In fact, chemists have determined that are FOUR main ways that chemicals interact

3 Four main types of reactions:
Synthesis Decomposition Single Displacement Double Displacement We will also learn about Combustion of a Hydrocarbon

4 Synthesis Reactions: A + B  AB
Two elements combine to form a compound or two small compounds form a larger compound Example: 2Mg + O2 2MgO

5 Decomposition Reactions:
AB  A B A larger compound breaks down into two elements or two smaller compounds. Example: 2H2O  2H2 + O2

6 1) 2H2 + O2 2H2O ____________________
Try These!! Classify each of the following reactions as synthesis or decomposition reactions. Synthesis 1) 2H2 + O2 2H2O ____________________ Decomposition 2) Na2CO3  Na2O +CO2 _____________________ 3) Hydrogen Peroxide  Water + Oxygen Gas __________________ Decomposition 4) Sodium + Chlorine gas  Sodium Chloride __________________ Synthesis

7 Single Displacement Reactions:
A + BC  AC + B An element takes the place of another element in a compound. Zinc has “kicked out” the hydrogen! Example: Zn + 2HCl  ZnCl2 + H2

8 Another way to think of this!...
One partner in a dancing couple gets “bumped out” by a stronger dancer! Penguin “bumps out” mouse to dance with monkey!

9 Double Displacement Reactions:
AB + CD  CB + AD Elements in different compounds switch places. Sodium and silver have switched places! Example: NaCl + AgNO3  AgCl +NaNO3

10 Two dancing couples switch partners!
+ + Switch places

11 YouTube Video Five Major Chemical Reactions

12 Try these!!: Classify each of the following reactions as single or double displacement reactions.
1) Zn + AgNO  Zn(NO3)2 + Ag _____________________ Single displacement 2) CuNO3 + KCl  KNO3 + CuCl ______________________ Double displacement 3) 2KCl + Pb(NO3)2  2KNO3 + PbCl2 ______________________ Double displacement 4) Al + Fe(NO3)  Al(NO3)3 + Fe ______________________ Single displacement

13 Combustion of a Hydrocarbon Fuel
when a fuel reacts with oxygen releasing heat Clean combustion produces: CARBON DIOXIDE and WATER Example: CH4 + O2  CO2+ 2H2O (methane)

14 Assignment: 1) Types of Chemical Reactions Chart
2) Worksheet: Types of Chemical Reactions

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