-
Let's begin with a kind of warm-up sheet which we can anchor in these little drawings I've made.
让我们先来热一下身,看一下我在黑板上画的图。
-
I'm from Houston, so it's just hot and hotter. These are the two seasons there.
我来自休斯顿，那儿只有热和更热这两个季节。
-
Something I can measure and I can tabulate, and when I turn my dT knob here I know what's going to happen to the enthalpy.
----热容，我们可以用实验，测出热容并成表,当我知道这里的变量。
-
Now, it used to be in the old days before I had kids, I could list off 15 current movies and help you a bit more with your dating strategy by giving you instant movie reviews, but now I have kids, I get to see precisely two movies a year, and the two movies I got to see this year were The Bourne Ultimatum and the Good Shepherd.
在我有孩子之前,我能列出15部热映的影片,我还能给你们提供不错的影评,帮助各位制定约会策略,但是现在我当爸爸了,我每年只能看两部电影,我今年看的两部就是,《谍影重重》和《特工风云》
-
I got on that hot road and off I went in a brand-new car driven by a Denver businessman of about 35.
我又上路了，外面天气很热,我上了一辆崭新的汽车，开车的丹佛商人看上去才36岁。
-
I mean, I can do it now because it's pretty hot.
我的意思是，因为现在很热，所以我可以练。
-
I don't want somebody opening up a clamshell with some hot food in it. It's not right. It's not right.
我不希望任何人打开一罐蛤壳,里面装着热的食物，这不对。
-
" "I don't know. Is it warm in here?"
我不知道，这里很热吗“
-
I don't mind, as it's kind of hot in here.
我不介意，因为里面有点热。
-
I didn't even need to know that heat capacity of the product, right. Because it's effect the thermal mass of the product is negligible compared to the thermal mass of the calorimeter.
我甚至不需要知道生成物的,热容是多少，因为生成物的,热质量的作用相比于,量热计的热质量是可以忽略的。
-
I am the system. I could be a system It could be a hot coffee in a thermos.
我就是系统，我可以是个系统,它可以是热水瓶里的热咖啡。
-
OK, so this, what I've sketched here would be a constant pressure calorimeter. There's a reaction.
好，我画的就是一个恒压量热计,其中进行一个反应。
-
Then we went on to look at thermochemistry, and that's what I want to continue today.
然后我们继续研究了热化学，这是我今天要继续讲的，的确。
-
so that's what we think we know in constant pressure calorimetry.
好，我想这就是我们,在恒压量热法中所知道的。
-
Cp, I forgot to put my little bar on top here because it's per mole Cp dT that's my dq here.
上面的Cv我忘记加上横线了,因为它也是摩尔热容。
-
So in principle, if I measure how much hotter, I can determine how much heat was produced, and from that, I should be able H to calculate delta H at T1.
所以原则上，如果我测量，变热了多少，我就能确定，有多少热被产生,从中我就可以计算T1下的Δ
-
So I need to find out the heats of formation of the iron oxide and the water.
所以我需要找出氧化铁和,水的生成热，如果我这么做了。
-
So if I worry about energy I have a pretty good chance of extracting out these heat capacities, right, and I don't have to worry about exactly which path and I can really mix things up.
而能量与热容有密切的关系,从能量就可以就算出这两个热容，我不需要考虑到底是哪一条路径,可以随意计算。
-
Noticed that's not per mole, right.
我是说量热计是个很大的东西。
-
So the way I've got things written here, q1 Heat's flowing from the hot reservoir to the engine that runs in a cycle.
我把这些都这些这里，是正的，q1，is，positive,热从高温的热源,传到循环工作的热机，对外做功。
-
I'm hot, compared to the air of the room, or cold if I'm somewhere that's warm.
我相对于室内的空气是热的，或是冷的如果我呆在一个温暖的地方。
-
All right, let me just go through one numerical example of a calorimetry calculation, OK.
好，让我们来做一个量热,法计算的例子，我不会把所有的。
-
Right? In other words I've got the stoichiometric coefficients in there and the values, and I'm subtracting the reactants from products -1652kJ/mol wind up with minus 1652 kilojoules per mole.
对吧？换句话说这里我用了化学,计量系数和生成热的值，从生成物中减去反应物,最后得到。
-
I've got reactants and calorimeter at T1.
我有T1下的反应物和量热计。
-
So here, I'm going to have delta H, is just the sum for all the products of delta heat of formation right? Here I'm going to put together all the products. So this is a positive heat of formation.
所以这里△H就是所有生成物的,生成热的和,对吧？这里,我要把元素组合成所有这些,生成物，所以这里是正的生成热。
应用推荐