Question

classify each chemical reaction:
reaction
type of reaction (check all that apply)
ch₄(g) + 2o₂(g) → co₂(g) + 2h₂o(g)
combination
precipitation
single replacement
combustion
double replacement
acid - base
decomposition
koh(aq) + hbro₄(aq) → kbro₄(aq) + h₂o(l)
combination
precipitation
single replacement
combustion
double replacement
acid - base
decomposition
h₂co₃(aq) → h₂o(l) + co₂(g)
combination
precipitation
single replacement
combustion
double replacement
acid - base
decomposition
ca(s) + br₂(l) → cabr₂(s)
combination
precipitation
single replacement
combustion
double replacement
acid - base
decomposition

Explanation:

Step1: Analyze first reaction

A hydrocarbon reacting with oxygen to form carbon - dioxide and water is a combustion reaction.

Step2: Analyze second reaction

A base (KOH) reacting with an acid ($HBrO_4$) to form a salt ($KBrO_4$) and water is an acid - base reaction. Also, the ions exchange partners, so it is a double - replacement reaction.

Step3: Analyze third reaction

A single compound ($H_2CO_3$) breaking down into two simpler substances ($H_2O$ and $CO_2$) is a decomposition reaction.

Step4: Analyze fourth reaction

Two substances (Ca and $Br_2$) combining to form a single compound ($CaBr_2$) is a combination reaction.

Answer:

1. combustion
2. double replacement, acid - base
3. decomposition
4. combination