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What are the negative effects of using chemicals?

What are the negative effects of using chemicals? Chemicals are used for different experiments in chemistry. But they can be harmful to humans and the environment when they are not properly used. i) Chemicals are used to keep fish and meat fresh and ripen fruits which is harmful to health. ii) Preservatives are used to preserve different food products which are risky for health. iii) Excessive use of chemical fertilizer harms plants. iv) Different harmful substances enter our bodies through blood by using artificial cosmetics, colors, etc. You may like What is Electrocardiograph? What is biological currency? What is activation energy? What is rate of reaction? What is green chemistry?

Separating liquid/liquid mixtures

 Separating liquid/liquid mixtures

In recent years there have been many oil tanker disasters, just like the one shown in Figure. These have resulted in millions of litres of oil being washed into the sea. Oil and water do not mix easily. They are said to be immiscible. When cleaning up disasters of this type, a range of chemicals can be added to the oil to make it more soluble. This results in oil and water mixing with each other. They are now said to be miscible. The following techniques can be used to separate mixtures of liquids.


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When you open the gas cylinder used for cooking, which action takes place first diffusion or effusion?