Revision work for chemistry Grade-8 2021. Chose the best. 1. In a brewery the Fermentation is carried out in ------------------- vats. A. Small B. Large C. Medium D. All 2. Drugs are substances which affect the ----------------------- in some way. A. Plastic B. Rocks C. Body D. None of them 3. I n the 1950s a new drug called Paracetamol was introduced. A. Paracetamol B. Placebo C. Emulsion D. Fermentation 4. An Emulsion is an example of a ---------------- . A. Emulsion B. Fermentation C. Placebo D. Colloidal 5. Detergents are ------------------ agents. A. ...
Define Cracking. Cracking : The process by which heavy hydrocarbon molecules are broken up into lighter molecules. Cracking is the name given to breaking up large hydrocarbon molecules into smaller and more useful bits. This is achieved by using pressures , temperatures and catalyst.
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