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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?

Science Class Seven

Class Seven


Chapter - 1 : Biodiversity

Chapter - 2 : Molecules and Atoms

Chapter - 3 : Structure of Matter

Chapter - 4 : Cell Science

Chapter - 5 : The World of Microorganisms

Chapter - 6 : Heat and Temperature

Chapter - 7 : Changes around Us

Chapter - 8 : Work, Energy and Power

Chapter - 9 : Disasters, Caused by Geo-natural Causes and Their Remedies

Chapter - 10 : Earth Surface and Plate Tectonics Theory

Chapter - 11 : Earthquake and Bangladesh

Chapter - 12 : Energy Flow in Organisms

Chapter - 13 : Skeletal and Digestive System

Chapter - 14 : Different Types of Rocks

Chapter - 15 : The Earth and the Universe

Investigative Study

Exercise Book


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