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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?

Hardware and software

Computer systems are now commonplace in every part of our daily life. This chapter introduces the basic components that make up these computer systems; most of these will be described in much greater depth in later chapters. Comparing books with computers is a good analogy: the actual pages and the ink used on the pages are equivalent to the hardware used to make up these computers; the words written on these pages are equivalent to the software. Without the words, the book is useless. Similarly, without software, computers would be of little use to any of us. 

Hardware is a general term for the physical components that make up a computer system, for example, keyboard, mouse, monitor, processor, circuit board, and so on. 

Software is a general term for the programs that control the computer system.

There are two types of software:
  • Systems software: programs that allow the hardware to run properly, e.g. operating systems
  • Applications software: programs that allow the user to do specific tasks, e.g. spreadsheets.


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