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.
What is Intertidal zone? Define Estuary. I ntertidal zone : O ceans are divided into zones. The shallowest part of the ocean ecosystem is called the intertidal zone. The intertidal zone is the area where the ocean meets the land between high and low tides. Estuary : The boundary where freshwater feeds into salt water is called an estuary . An estuary is an area where a freshwater river or stream meets the ocean.
Comments
Post a Comment