Download Types of Chemical Reactions

Unit 4 Lesson 4
Pages 199-203; Text section 7.2
Types of Chemical Reactions
Chemical reactions can be classified into one of four categories depending on
what type and how many reactants are present. We can use a generalized equation to
represent each. In the generalized equation, the letters A and B represent positive ions
(elements that lose electrons). The letters X and Y will represent negative ions (elements
that gain electrons). In a synthesis reaction, two or more reactants are combined to form
one product. The generalized equation is A + X
AX
A decomposition reaction is one where one product breaks down into two or more
products. It is the opposite of a synthesis reaction. The generalized equation for a
decomposition reaction is AX
A + X
During a single replacement reaction, the reactants are a single element and a
compound. The single element will take the place of one of the elements in the
compound. The element that was replaced will be off by its self. The generalized
equation for a single replacement reaction is A + BX
AX + B
In a double replacement reaction, the elements in two compounds switch. The
generalized equation is AX + BY
AY + BX.
The following websites presents the same material. If you need more explanation or
examples, view it. The site calls double replacement reactions ionic and single
replacement, replacement. It also contains problems where you write the products for
each type of reaction given only the reactants. If you try some of these (I suggest it- later
it will be for a grade), you will need to write the formulas for the reactants.
Questions:
Describe a synthesis reaction.
Describe a decomposition reaction.
Describe a single replacement reaction.
Describe a double replacement reaction.
Identify each type of reaction shown:
2H2O
2H2 + O2
AgNO3 + NaCl
2H2 + O2
AgCl + NaNO3
2H2O
Cu + 2AgNO3
Cu(NO3)2 + 2Ag
For each problem:
1.
Decide what type of reaction is shown
2.
Write the products
3.
Balance the equation
1. _____Na2S + _____Cl2
_______________ + ______________
Type of reaction=
2. _____ PbO + _____Zn(C2H3O2)2
_____________ + ________________
Type of reaction =
3. _____FeCl3
______________ + ___________________
Type of reaction =
4. _____ Al(ClO3)3 + _____CaCO3
________________ + _________________
Type of reaction =
5. _____K2S + _____Ba
Type of reaction =
___________________ + __________________