Question

Match the types of chemical reactions in Column II with the description in Column I.

Column I
a. synthesis reaction
b. decomposition reaction
c. combustion
d. single-displacement reaction
e. double-displacement reaction

Column II
1. A precipitate, water, or a gas forms when two ionic compounds in solution are combined.
2. Two or more substances combine to form another substance.
3. One element replaces another in a compound.
4. One substance breaks down into two or more substances.
5. A type of synthesis reaction that produces heat and light.

Answer 1

The #4 description matches a decomposition reaction, which involves one substance breaking down into more substances. The #5 description corresponds to a combustion reaction, which is a type of synthesis reaction that produces heat and light.

Step-by-step explanation:

To match the types of chemical reactions with their descriptions, we look at two specific cases:

• Decomposition reaction: One substance breaks down into two or more substances. This type corresponds to the #4 description. An example of this is the decomposition of hydrogen peroxide into water and oxygen gas:

2 H2O2(aq) → 2 H2O(l) + O2(g)

• Combustion reaction: A type of synthesis reaction that produces heat and light. This corresponds to the #5 description. An example is the combustion of methane:

CH4 + 2 O2 → CO2 + 2 H2O + heat and light

By identifying the characteristics of these reactions, we can predict the products formed in unknown chemical equations and classify reactions as synthesis, decomposition, single replacement, double replacement, or combustion.