Question

in the following equation for a chemical reaction, the notation (s), (l), or (g) indicates whether the substance indicated is in the solid, liquid, or gaseous state. co(g) + 3h2(g) → ch4(g) + h2o(g) + energy. identify each of the following as a product or a reactant: h2o(g), co(g), ch4(g), h2(g). when the reaction takes place energy is _. the reaction is _.

Explanation:

Step1: Recall reactant - product concept

In a chemical reaction, reactants are on the left - hand side of the arrow and products are on the right - hand side.

Step2: Identify reactants

For the reaction $CO(g)+3H_2(g)\longrightarrow CH_4(g)+H_2O(g)$, the reactants are $CO(g)$ and $H_2(g)$ because they are on the left - hand side of the arrow.

Step3: Identify products

The products are $CH_4(g)$ and $H_2O(g)$ as they are on the right - hand side of the arrow.

Step4: Determine energy type

Since energy is on the right - hand side of the arrow, it is a product. When the reaction takes place, energy is released, so this is an exothermic reaction.

Answer:

$CO(g)$: Reactant
$H_2(g)$: Reactant
$CH_4(g)$: Product
$H_2O(g)$: Product
The reaction is exothermic (energy is a product).