All chemicals have positive and negative outcomes, depending on how they are used. Most chemicals have at least one beneficial outcome.
Some examples:
Bleach is a very powerful cleaner and whitener. Ammonia is also one of the oldest and most powerful household cleaner. Used separately, each have their purposes and benefits. HOWEVER, bleach and ammonia can produce a *deadly* type of fumes if used together.
Hair dyes are chemicals that women (and men) enjoy using to change their appearance. Dyes can cover gray hair, too. However, hair dyes can cause extreme problems if a person is allergic to the chemicals. The scalp can be burned, leading to chronic irritation and scabbing. Hair loss and thinning can ensue. Yet, millions of people try dyes, love it, and have no problems.
Laundry detergents and additives are good examples of the benefits of chemicals. A concentrated washing agent can remove stains, protect colors, whiten whites, and prolong the wear-ability of clothing. Yet, every year, poison control and ERs deal with issues of children digesting laundry detergents. They can damage eyesight, burn the digestive tract from mouth to stomach, and can cause contact dermatitis of the skin.
The chemicals used in man-made fertilizers are meant to replace and react with the chemicals in the soil that are beneficial to the growth of Plants.
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Chemicals are just chemicals - there are no particular 'science' ones. Perhaps you refer to 'man made' chemicals, and in particular the mind-altering ones. But even there there are many chemicals or drugs that provide beneficial effects - e.g. simple lithium has beneficial mind calming effects. And anesthetics are widely used to modify the body's response to pain. Perhaps you could give more focus to your question.
Because the chemicals inside the beneficial burn away the organism.
This depends on which chemical you are referring to because different chemicals are beneficial in there own ways.
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Because they are made from nature and do not contain any synthetic chemicals
The most important is the concentration; any chemical can be dangerous if a specified limit is exceeded.
Essential oils are very beneficial for your health, beauty, and wellness. Free yourself from the chemicals, toxins in cleaners, medicines, skin and hair products. Make your own with essential oils.
There are beneficial chemicals and minerals in Castor oil however it has never made it to a popular arthritis remedy list.
No they have a natural mineral that creates a beneficial storage environment to help extend the life and freshness of fruits, vegetables