## Question:

Combination: KOH(s) + CO_2(g) -->

Part B

decomposition: HBr(g) -->

Part C Single replacement: H_2O(I) + F_2(p) -->

## Types of Chemical Reactions

Chemical reactions occur between two or more reagents (called reactants), to form one or more new species (called products). The electrons of the reagents are involved actively in the reaction and may be transferred or shared. Chemists have grouped chemical reactions according to the manner in which reagents react. Types of reactions include combination, decomposition, single and double replacement, combustion, etc.

The combination reaction is written generically as:

{eq}A+B \rightarrow AB {/eq}.

For the reagents given to us, the corresponding equation is:

{eq}KOH + CO_2 \rightarrow KHCO_3 {/eq}

(B)

The generic equation for decomposition is:

{eq}AB \rightarrow A + B {/eq}

For our own reagents, we write:

{eq}2HBr \rightarrow H_2 + Br_2 {/eq}.

(C)

The single replacement equation is:

{eq}A+BC \rightarrow AC + B {/eq}.

Here, it is important to know which element in our reaction corresponds to B and which to C. The chemistry of the element A is useful in ascertaining this. For our reagents, we may write:

{eq}2H_2O + 2F_2 \rightarrow 4HF + O_2 {/eq}.