English for chemists


Factors Influencing the Rate of Reactions



Download 5,82 Mb.
bet75/122
Sana31.12.2021
Hajmi5,82 Mb.
#207206
TuriУчебное пособие
1   ...   71   72   73   74   75   76   77   78   ...   122
Bog'liq
stepanova t a english for chemists

Factors Influencing the Rate of Reactions
Every chcmical reaction requires some time for its complctiQn, but some reactions arc very fast and some arc very slow. Reactions between ions in solution without change in oxidation state arc usually extremely fast. An example is the neutralization of an acid by a base, which proceeds as fast as the solutions can be mixed. Presumably nearly every time a hydronium ion collides with a hydroxide ion reaction occurs, and the number of collisions is vciy great, so that there is little delay in the reaction. The formulation of a precipitate, such as that of silver chloridc when a solution containing silver ion is mixed with a solution containing chloridc ion, may require a few scconds, to permit the ions to diffuse together to form the crystalline grains of the precipitate:
Ag*(aq) + Cl'(aq) -» AgCl(c).
On the other hand, ionic oxidation-rcduction reactions arc sometimes very slow. An example is the oxidation of a stannous ion by a fcrric ion:
2FC5* + Sn*’ —» 2Fc2* + Sn4\
This reaction docs not occur every time a stannous ion collides with one or two fcrric ions. In order for a reaction to take place, the collision must be of such a nature that electrons can be transferred from one ion to another, and collisions that permit this electron transfer to occur may be rare.
An example of a reaction that is extremely slow at room temperature is that between hydrogen and oxygen:

Download 5,82 Mb.

Do'stlaringiz bilan baham:
1   ...   71   72   73   74   75   76   77   78   ...   122




Ma'lumotlar bazasi mualliflik huquqi bilan himoyalangan ©hozir.org 2024
ma'muriyatiga murojaat qiling

kiriting | ro'yxatdan o'tish
    Bosh sahifa
юртда тантана
Боғда битган
Бугун юртда
Эшитганлар жилманглар
Эшитмадим деманглар
битган бодомлар
Yangiariq tumani
qitish marakazi
Raqamli texnologiyalar
ilishida muhokamadan
tasdiqqa tavsiya
tavsiya etilgan
iqtisodiyot kafedrasi
steiermarkischen landesregierung
asarlaringizni yuboring
o'zingizning asarlaringizni
Iltimos faqat
faqat o'zingizning
steierm rkischen
landesregierung fachabteilung
rkischen landesregierung
hamshira loyihasi
loyihasi mavsum
faolyatining oqibatlari
asosiy adabiyotlar
fakulteti ahborot
ahborot havfsizligi
havfsizligi kafedrasi
fanidan bo’yicha
fakulteti iqtisodiyot
boshqaruv fakulteti
chiqarishda boshqaruv
ishlab chiqarishda
iqtisodiyot fakultet
multiservis tarmoqlari
fanidan asosiy
Uzbek fanidan
mavzulari potok
asosidagi multiservis
'aliyyil a'ziym
billahil 'aliyyil
illaa billahil
quvvata illaa
falah' deganida
Kompyuter savodxonligi
bo’yicha mustaqil
'alal falah'
Hayya 'alal
'alas soloh
Hayya 'alas
mavsum boyicha


yuklab olish