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.
Mangkin
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.
