What is Chemistry?
Chemistry is the study of matter and energy and the interactions between them. This is also the definition for physics, by the way. Chemistry and physics are specializations of physical science. Chemistry tends to focus on the properties of substances and the interactions between different types of matter, particularly reactions that involve electrons. Physics tends to focus more on the nuclear part of the atom, as well as the subatomic realm. Really, they are two sides of the same coin. * A science that deals with the structure, composition and properties of items and with the transformations that they undergo - the composition and chemical properties of a substance - chemical processes and phenomena (as of an organism) - a strong mutual attraction, attachment, or sympathy. Why study chemistry?
Because understanding chemistry helps you to understand the world around you. Cooking is chemistry. Everything you can touch or taste or smell is a chemical. When you study chemistry, you come to understand a bit about how things work. Chemistry isn't secret knowledge, useless to anyone but a scientist. It's the explanation for everyday things, like why laundry detergent works better in hot water or how baking soda works or why not all pain relievers work equally well on a headache. If you know some chemistry, you can make educated choices about everyday products that you use. Chemistry is a big part of your everyday life. You find chemistry in daily life in the foods you eat, the air you breathe, your soap, your emotions and literally every object you can see or touch. Here's a look at some everyday chemistry: Uses of Chemistry:
Over the last two centuries, chemistry has changed our daily lives more than any other of the sciences. Chemistry makes our world more colorful, more efficient, more reliable and safer. Pharmaceuticals, cosmetics, toiletries and body care products, airbags and brake fluid - they're all chemical products. in cooking use of baking soda., yeast powder , purification of drinking water, insecticides, soaps &detergents utensils made of metals, plastic cups, plates, bags, fuels used for cooking, in vehicles use of chemical fertilizers, pesticides, products made of rubber like tyre, bags, shoes, manufacturing building materials-bricks , cement, tiles, ink, gel pens, glue, whitener, paints, synthetic fabrics like nylon, rayon, dyes, bleaching agents medicines--- the list can go on. Starting from tooth brush & paste in the morning every material we use is a product of chemistry. Here are some little explanations on how chemistry flows in our daily life: Why Do Onions Make You Cry?
* Unless you've avoided cooking, you've probably cut up an onion and experienced the burning and tearing you get from the vapors. When you cut an onion, you break cells, releasing their contents. Amino acid sulfoxides form sulfenic acids. Enzymes that were kept separate now are free to mix with the sulfenic acids to produce propanethiol S-oxide, a volatile sulfur compound that wafts upward toward your eyes. This gas reacts with the water in your tears to form sulfuric acid. The sulfuric acid burns, stimulating your eyes to release more tears to wash the irritant away. * Cooking the onion inactivates the enzyme, so while the smell of cooked onions may be strong, it doesn't burn your eyes. Aside from wearing safety goggles or running a fan, you can keep from crying by refrigerating your onion before cutting it (slows reactions and changes the chemistry inside the onion) or by cutting the onion under water. * The sulfur-containing compounds also leave a characteristic odor on your fingers. You may be able to remove or reduce some of the smell by wiping your fingers on a stainless steel odor eater. How Does Sunscreen Work?
* Sunscreen combines organic and inorganic chemicals to filter the light from the sun so that less of it reaches the deeper layers of your skin. Like a screen door, some...
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