What is a “driving force”? What are some of the driving forces discussed in this section that te

What is a “driving force”? What are some of the driving...

Key Concepts

Phase Changes and Precipitation

The formation of a gas, precipitate, or any phase separation can serve as a driving force by effectively removing one of the products from the reaction mixture. This shifts the equilibrium and promotes the continuation of the reaction according to Le Chatelier’s principle.

Enthalpy Change (?H)

Enthalpy change represents the heat absorbed or released during a reaction. Exothermic reactions, which release heat, often have a negative ?H and contribute to a driving force by stabilizing the products relative to the reactants.

Entropy Change (?S)

Entropy change reflects the degree of disorder or randomness in a system. An increase in entropy (a positive ?S) can drive a reaction forward by compensating for unfavorable enthalpy changes, especially when multiplied by the temperature in the Gibbs free energy equation.

Gibbs Free Energy (?G)

Gibbs free energy is the quantitative measure that indicates the spontaneity of a reaction. A negative ?G means that the reaction can proceed under constant pressure and temperature. It integrates both enthalpy and entropy changes, making it a comprehensive descriptor of the driving force.

Driving Force

A driving force in chemical reactions is any factor that lowers the overall free energy of the system, thereby making the reaction thermodynamically favorable. This concept is central to understanding why certain reactions occur spontaneously, as it encompasses all aspects that push the system toward a more stable state.

Transcript

00:01 Chemical equations happen when the reactants turn into the products.

00:05 So reactants yield products.

00:08 Now, for this to happen, not all reactions happen normally, right? some of them need heat.

00:13 Some of them are going to need other chemicals to make it happen.

00:18 So there's some reactions that actually do happen naturally.

00:21 Think about mentos and soda, if you stick mentos and soda, it naturally reacts, right? so those are called driving forces.

00:29 Driving forces are forces that push the reactants to turn into the products.

00:36 There's four different driving forces that we know in which it makes the reactions spontaneously happen.

00:44 It wants to go to products, right? not all reactions want to go to products, but this one specifically do.

00:50 So the first one is the formation of water and an acid -based reaction.

00:58 So when you have an acid and you have a base, and we know it's an acid because of the h, and we know it's a base because of the oh, it will form water, and this is the driving force.

01:10 So, really, water really, really likes to form, and it will form a salt.

01:14 And the salt is any ionic compound.

01:16 It doesn't have to be just table salt.

01:18 Table salt is just one of the most common ones because that's a driving force.

01:22 Second one would be the formation of a gas, and that's usually hydrogen gas, oxygen gas, co2.

01:34 The most common ones that happen, as, for example, an acid and a metal, that usually makes hydrogen gas and the metal solution.

01:45 That's very, very likely to happen, right? the gas is very common.

01:50 It likes to form, so the reaction is going to proceed forward in order to form that gas.

01:58 Another common one is a formation of solids, and this are precipitation reactions, which happen a lot.

02:08 So chemical reactions are ones where you see a change...

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