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ابزار وبمستر

کنکور زیست و شیمی تبریز - واکنش‌ها بر اساس آزاد کردن یا جذب گرما به دو دسته تقسیم می‌شوند
کنکور زیست و شیمی تبریز
تقویتی و کنکور زیست شناسی و شیمی تبریز
به سایت ما خوش آمدید
ابزار اینستا گرام
* واکنش‌های شیمیایی معمولاً به دو روش زیر انجام می‌شوند: 
1- واکنش در حجم ثابت (V=0∆) 
2- واکنش در فشار ثابت (P=0∆)

1- بررسی واکنش در حجم ثابت: (واکنش در ظرف سربسته) 
∆V=0⇒w=0⇒∆E=q+w⇒∆E=q یا qv
☑️☑️☑️گرمای مبادله شده برای واکنش در حجم ثابت:qv 

2-بررسی واکنش در فشار ثابت: (واکنش در ظرف سربسته یا سرباز) 
∆E=q+w  و  q≠0 ,w≠0 
با استفاده از تغییر حجم ، فشار را ثابت نگه می‌داریم. 
qp=∆E-w 
*گرمای واکنش در فشار ثابت:qp
* بیش‌تر واکنش‌های شیمیایی در فشار ثابت انجام می‌شود. 
* گرمای مبادله شده در فشار ثابت را با qp یا نماد H∆ نشان می‌دهند. 
گرمای واکنش ، آنتالپی واکنش:H∆ 
*برای واکنش‌هایی که مواد شرکت‌کننده در آن‌ها جامد یا مایع هستند (گازی نیستند) 
*مقدار V∆ ناچیزه => E∆ با H∆ برابره تقریبا
* در واکنش سوختن تمامی آلکان‌ها (به جز متان) 
  ∆E≠∆H⇐w=0⇐∆V=0
 ‼️‼️در واکنش سوختن متان
 ∆E≠∆H⇐w=0⇐∆V=0





نوع مطلب : جزوه شیمی، شیمی دهم، کنکور، شیمی، تقویتی تبریز، تدریس خصوصی تبریز، كنكور شیمی تبریز، تقویتی شیمی تبریز، 
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