heme 6
Uamlng
i Identify a reaction as a combination, decomposition, reptacement, or combustion reaction.
Two or morę combine a single reactants to yield product
7.4 Typesof Reactions
A great number of reactions occur in naturę, in biological systems, and in the laboratory. However, there are some generał pattems among all reactions that help us classify reactions. Some reactions may fit into morę than one reaction type.
Combination Reactions
In a combination reaction, two or morę elements or compounds bond to form one product. For example, sulfur and oxygen combine to form the product sulfur dioxide.
S(s) + O 2(g) — S02(g) -■
In Figurę 7.3, the elements magnesium and oxygen combine to form a single product, magnesium oxide.
^(^hemistry k place
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Chemical Reactions and Equations
2Mg(s) + O2(g)-- 2MgO(s)
In other examples of combination reactions, elements or compounds combine to form a single product.
N2(g) + 3H2(g) -*■ 2NH3(g) Ammonia
Cu (s) + S(s) -► CuS(r)
MgO(r) +CO2(g)-* MgC03(5)
2 Mg(.T) + D 2(g) -* 2 MgO(.y)
Magnesium Oxygen Magnesium oxide
Figurę 7.3 Ina combination reaction, two or morę substances combine to form one
substance as product.
■' J; What hoppens to the reactants in a combination reaction?
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