Question

Identify the reactants and products in this chemical equation. \(4 \mathrm{NH}_{3}(g)+5 \mathrm{O}_{2}(g) \longrightarrow 4 \mathrm{NO}(g)+6 \mathrm{H}_{2} \mathrm{O}(g)\).

Short answer

Reactants: 4 NH3(g), 5 O2(g); Products: 4 NO(g), 6 H2O(g)

Step-by-step solution

Identify Reactants

Look at the left side of the arrow in the chemical equation. All substances present before the arrow are the reactants.

Identify Products

Look at the right side of the arrow in the chemical equation. All substances present after the arrow are the products.

Write Down Reactants and Products

List the reactants and products separately.

Key concepts

Chemical Reactions

Understanding chemical reactions is fundamental in chemistry. A chemical reaction is a process where reactants are transformed into products through breaking and forming chemical bonds. This process involves rearranging atoms to create new substances, which can involve changes in energy, color, temperature, and other properties. For instance, when you burn sugar or see rust form on iron, those are examples of chemical reactions.

In our exercise, we looked at the chemical reaction represented by the equation:

(1) 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g).

We identified ammonia (NH₃) and oxygen (O₂) as the reactants - the starting materials, and nitrogen monoxide (NO) and water (H₂O) as the products - the substances formed as a result of the reaction. Recognizing these components in a chemical equation allows us to dig deeper into the heart of chemistry, exploring how and why substances interact with one another.

Balancing Chemical Equations

For a chemical equation to be accurate, it must be balanced, meaning it respects the conservation of mass. The number of atoms for each element must be the same on both sides of the equation. Here's why: Atoms are neither created nor destroyed in chemical reactions; they are just rearranged.

Steps to Balance a Reaction

First, write the unbalanced equation. List the number of atoms of each element present on both the reactant and product sides. Adjust coefficients before the chemical formulas to balance these numbers. Continue this process until you achieve balance. In the exercise, the equation is already balanced: (2) 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g).

There are equal numbers of nitrogen atoms (N), hydrogen atoms (H), and oxygen atoms (O) on both sides of the equation. This balanced equation ensures that the law of conservation of mass is satisfied, providing an essential check for the reaction's feasibility.

Stoichiometry

Stoichiometry might seem intimidating at first, but it's really just a way of quantifying chemical reactions to predict the amounts of reactants needed and products formed. Essentially, it is the mathematics behind chemistry.

Basics of Stoichiometry

The balanced chemical equation is the recipe that stoichiometry follows. It tells us the proportions in which reactants combine and the amounts of products formed. For instance, the stoichiometry of the balanced reaction (3) 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g), implies that 4 moles of ammonia react with 5 moles of oxygen to form 4 moles of nitrogen monoxide and 6 moles of water.

Imagine you know the amount of ammonia you have, and you want to find out how much water will be produced. Using stoichiometry, you can calculate this because the relationships between the substances are defined by the balanced equation. This application of stoichiometry is vital in areas like manufacturing, where predicting yields can mean the difference between profit and waste.