Question

1. in a chemical reaction, a catalyst is something that speeds up the reaction. it is usually written above the arrow in the chemical equation. circle the catalysts in the following reactions;

so2(g) + o2(g) \xrightarrow{v2o5} so3(g)
ch3ch2oh(aq) + hcl(g) \xrightarrow{h2so4} ch3ch2cl(s) + h2o(l)

1. in the last reaction above, which of the compounds are liquids?
2. in the last reaction above, which of the compounds are solids?
3. in the last reaction above, which of the chemicals are gases?
4. in the last reaction above, which of the chemicals are dissolved in water?

Explanation:

Step1: Identify Catalyst Definition

A catalyst speeds up a reaction and is written above the arrow (not consumed).

Step2: Analyze First Reaction

Reaction: $\ce{SO2(g) + O2(g) ->[V2O5] SO3(g)}$.
$\ce{V2O5}$ is above the arrow, so it's the catalyst.

Step3: Analyze Second Reaction

Reaction: $\ce{CH3CH2OH(aq) + HCl(g) ->[H2SO4] CH3CH2Cl(s) + H2O(l)}$.
$\ce{H2SO4}$ is above the arrow, so it's the catalyst.

Answer:

For the first reaction: $\boldsymbol{\ce{V2O5}}$
For the second reaction: $\boldsymbol{\ce{H2SO4}}$