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سامانه مروارید - سوالات شیمی اول دبیرستان

سوالات شیمی اول دبیرستان

نویسنده :علی
تاریخ:چهارشنبه 6 آذر 1392-05:40 ب.ظ

     فصل اول سال اول

 

 

1- به سوالات زیر پاسخ دهید :

الف) در تركیب NaCl نوع پیوند را مشخص كنید ؟ ( یونی یا كووالانسی )

ب) كاغذ تورنسل در ظرف حاوی HNO3  به چه رنگی در می آید ؟ چرا ؟

 

2- مقدار DO  آب یك آبگیری ppm  6  است . در 200 گرم از آب این آبگیر چند گرم اكسیژن حل شده است ؟

 

3- درستی یا نادرستی هر یك از عبارت ها را با ذكر دلیل مشخص كنید :

الف) یخ روی آب شناور می ماند ، چون چگالی یخ از آب بیشتر است .

ب) مولكول ها از اتصال اتم ها در اثر پیوند شیمیایی بوجود می آیند .

 

4- نسبت تعداد عناصر به تعداد اتم ها را در استون  ( CH3COCH3 )  مشخص كنید

 

5- دو جسم جرم مساوی دارند . یكی از آنها بر سطح آب شناور می ماند و دیگری در آب فرو می رود . كدام جسم حجم بزرگتری دارد ؟ چرا ؟

 

6- نحوه ی برهم كنش مولكول های آب در اطراف یون Cl-  را رسم كنید ؟

 

7- چرا آب باران اندكی خاصیت اسیدی دارد ؟

 

8- به سوالات زیر پاسخ دهید :

الف) چگونه میتوان سختی موقت آب را از بین برد ؟

ب) كدام ماده رنگ كاغذ تورنسل را قرمز می كند ؟ NaOH  یا HNO3 

 

9- هر یك از محلول های زیر چه رنگی به آب می دهد ؟

الف) سركه   ب) محلول غلیظ NaOH    پ) CO2 محلول در آب

 

10- با توجه به اینكه گرمای تبخیر آب معادل kj  2260  و الكل kj  860  است ، نیروی بین مولكولی در كدام مایع قویتر است ؟ چرا ؟




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