# Chemistry coursework enthalpy

But for an ideal gas, you can always write this. One atmosphere, one bar. Anybody have an idea? What are these quantities? Little p means the path is a constant pressure path. And the reason enthalpy was invented was exactly for that reason, because we need some way to figure out how to relate the heat coming in or out of a system under a constant pressure process.

The u plus p V. How many people think this is irreversible? All right, so this is the heat flowing in or out of the system, and these are all functions of state. This is where the intuition comes from.

Because we want to know this. Now, I know how to relate the heat flow to temperature change, through the heat capacity. What is the pressure at?

Right, let me add one more piece of data here which I said in words, but which is actually important to write down before doing the problem. This is just an equality. Any questions on that? Delta u is q plus w. Rearrange that, delta u is plus p delta V is equal to q p.

And you talked about isothermal expansion, the Joule expansion. Is this a reverse -- any guesses? Last time you talked about the first law of thermodynamics.

This is already branded in your brain, right? So for reversible process, constant pressure, what do we know? How many people vote that this is reversible? And this turns out to be very useful to remember. There is the H right there.

This term here is equal to zero. Constant pressure, that means dp is equal to zero. What else do we know? You saw a very important result.

There is insulation here. Insulation on the bottom.

Now these quantities were useful because you could relate them. How many people vote for that this is a reversible process?

But not so slowly that these two are in equilibrium with each other. In this case, p is a constant because the path is constant. You take a throttle valve, which consists of some sort of porous plug between two cylinders that is insulated.

Heat under constant pressure reversible work. And you also saw that du then could be written as Cv dT for an ideal gas always.Enthalpy 2|Page Anjelina Qureshi Mrs Gravell Rates of Reaction Coursework Chemistry Year 11 Enthalpy, in chemistry, is the heat content in a chemical reaction.

The enthalpy change is the amount of heat absorbed or released when a chemical reaction occurs at a constant pressure. Jun 24,  · Today's episode dives into the HOW of enthalpy. How we calculate it, and how we determine it experimentally even if our determinations here at Crash Course.

Understanding why enthalpy can be viewed as “heat content” in a constant pressure system. Enthalpy: Crash Course Chemistry #18 Energy is like the bestest best friend ever and yet, most of the time we take it for granted. This course is a precursor to the Advanced Chemistry Coursera course.

Areas that are covered include atomic structure, periodic trends, compounds, reactions and stoichiometry, bonding, and thermochemistry.

This course is designed to cover subjects in advanced high school chemistry courses, correlating to the standard topics as established by the American Chemical Society. This course is a precursor to the Advanced Chemistry Coursera course. Chemistry 12 Tutorial 2 - Enthalpy and Entropy Tutorial 2 Page 3 Of course, you might remember another way to show an endothermic or exothermic reaction.

Chemistry coursework enthalpy
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