If blue spheres represent nitrogen atoms and white spheres represent hydrogen atoms, (7.1,7.8) a

If blue spheres represent nitrogen atoms and white spheres...

Key Concepts

Stoichiometry

Stoichiometry is the quantitative relationship between reactants and products in a chemical reaction. It involves calculating the proportions and quantities of substances that react and are produced. In the context of balancing equations, stoichiometry helps determine the appropriate coefficients required to satisfy the conservation of atoms for each element involved in the reaction.

Balanced Chemical Equations

Balanced chemical equations are formulations of chemical reactions where the number of atoms for each element is identical on both sides of the equation. This concept ensures that the law of conservation of mass is adhered to, meaning that matter is neither created nor destroyed during the reaction. Creating a balanced equation involves identifying the correct stoichiometric coefficients for reactants and products so that the total count of each type of atom is equal on both sides.

Interpreting Molecular Diagrams

Interpreting molecular diagrams involves analyzing visual representations of molecules where atoms can be depicted by different colored spheres or shapes. This skill is critical for understanding the spatial arrangement and connectivity of atoms in a molecule, thereby allowing one to correctly identify reactants and products. It also aids in correlating the diagram with the corresponding chemical formulas and balanced equations.

Transcript

00:01 This question is first asking us to write the balanced equation for the reaction.

00:06 So, let's take a look at our reactants.

00:09 Well, we have some diatomic blue spheres, so we have some n2s, and we also have some diatomic white spheres, so those are diatomic hydrogens.

00:21 Okay, so those are our reactants.

00:22 What about our products? so we have two different possibilities for our products.

00:27 And some of them, we have three hydrogens and one, one nitrogen, okay.

00:41 And we also have one where we have a diatomic blue sphere, so an n2.

00:53 And then products b, we have only these three h's one n.

01:03 So what do we call the 3h1n? well, we can write that simply as nh3.

01:14 Okay.

01:15 And as you can see here, the n2 is actually a leftover from our reactants.

01:22 So that would be an excess, essentially, right? so we wouldn't include that in our products.

01:31 So let's write the actual balance equation.

01:33 Well, we have n2 plus h2 producing nh3.

01:40 So how do we balance this? well, we have two n2s on the left, right? so we want to put a coefficient of 2 in front of the nh3.

01:48 So now our nitrogens are balanced.

01:54 What about our hydrogens? we have two hydrogens on the left.

01:57 We have a total of six hydrogens, right? because if there's three hydrogens here times two, like it's a six hydrogens.

02:04 So we want to put a coefficient of three in front of the h2...

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