A chemical change happens to a substance when there is a
change in the composition or make up of the substance. In other words, one or
more new substances are created when there is a chemical change. The new
substance is chemically different from the substance before the change. The
energy involved in a chemical change is usually substantial.
Example
The burning of hydrogen (with oxygen) to produce water is an example of chemical change.
hydrogen + oxygen --> water
Perubahan Kimia
Perubahan kimia berlaku apabila terdapat perubahan dalam kandungan atau komposisi sesuatu bahan. Justeru itu, bahan baru akan terbentuk dengan adanya pertukaran kandungan jirim. Bahan baru yang terhasil berbeza secara kimia daripada bahan sebelum perubahan tersebut. Perubahan tenaga yang terlibat dalam perubahan seperti ini adalah besar.
Contoh Perubahan Kimia
hidrogen + oksigen --> air
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Quiz
Compare chemical change with physical change. Click here to find out more.
Bandingkan perubahan kimia dengan perubahan fizikal.
Klik di sini.