Write the balanced chemical equation for the reaction of solid strontium with iodine gas.

Name: Problem 85, Chapter 8: Chemistry A Molecular Approach
Uploaded: 2019-07-24T22:53:06-08:00
Duration: 4 min 12 s
Channel: Alyssa Sherry
Description: Write the balanced chemical equation for the reaction of solid strontium with iodine gas.

Write the balanced chemical equation for the reaction of...

Key Concepts

Balancing Chemical Equations

This concept refers to the process of ensuring that the number of atoms of each element is the same in both the reactants and the products of a chemical reaction. It is fundamental in adhering to the law of conservation of mass, as every balanced equation must reflect that atoms are neither created nor destroyed during a reaction.

Stoichiometry

Stoichiometry involves the quantitative relationship between reactants and products in a chemical reaction. It guides the determination of the appropriate coefficients needed to balance a chemical equation and ensures that the proportions of substances correctly represent the conversion of reactants into products.

Chemical Reactivity of Metals

This concept describes the tendency of metals to react with non-metals, typically resulting in transfer of electrons and formation of ionic compounds. It highlights how metals, which often lose electrons, combine with elements that accept electrons, a fundamental behavior observed in many chemical reactions involving metals.

Ionic Compound Formation

Ionic compound formation occurs when there is a transfer of electrons between atoms, leading to the creation of positively charged ions (cations) and negatively charged ions (anions) that combine to form a stable ionic lattice. This concept is crucial when considering reactions between metals and non-metals, as it explains the type of bonds that result from such interactions.

Transcript

00:01 In this problem, we're told that solid strontium is reacting with iodine gas and we're asked to write a balanced chemical equation.

00:11 So our first step is to set up our reaction using symbols.

00:16 So the symbol for strontium is sr and this is a solid.

00:22 And this is reacting with iodine, which is symbolized by i, sub 2 as a gas.

00:29 And we're going to draw an arrow to separate our reactive side from our product side.

00:36 But we aren't given what our product should be.

00:40 So that leads us to our next step.

00:44 We notice that in this reaction we have a metal, strontium, and a halogen, iodine.

00:53 And on page 370 of our textbook, we're given a general formula for the reaction between a metal and a halogen.

01:00 This formula is 2m, where m is the metal, plus n x2, where x is our halogen, and that gives us 2m x subn as a solid.

01:23 Great.

01:25 So how does this apply to our chemical reaction above? well, we need to put a 2 in front of our strontium, and we can put an m.

01:36 In front of our halogen and then our product is going to be two times our metal which is strontium times our halogen i sub n as a solid but we're not quite done yet next we need to figure out what this n is so that we have a the correct product in order to balance the elements in our product what we need to do is we need to look at the charges of both of the ions in our product.

02:18 So strontium is an alkali earth metal, and alkali earth metals have a charge of plus two...

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