Catalyst
A
catalyst is a substance that changes the rate of a
chemical reaction. However, it itself is chemically
unchanged at the end of the reaction. A positive catalyst
speeds up the rate of reaction. A negative catalyst slows
down the rate of reaction. Only a small amount of catalyst
is required to create a big change in the reaction. A
catalyst is usually a transition metal such as platinum,
nickel and iron.
For
a list of catalysts, click here.
Mangkin
ialah sesuatu bahan yang mempengaruhi kadar tindakbalas
kimia. Mangkin sendiri tidak berubah secara kimia pada
akhir tindakbalas. Mangkin positif mencepatkan kadar
tindakbalas. Mangkin negatif melambatkan kadar
tindakbalas. Hanya sedikit mangkin sahaja diperlukan untuk
perubahan yang besar dalam sesuatu tindakbalas kimia.
Contoh mangkin ialah platinum, emas dan besi.
Untuk senarai mangkin klik di sini.
Untuk senarai mangkin klik di sini.