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CHEMISTRY IN DAILY LIFE

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.

ELEMENTS IN THE HUMAN BODYMost of the human body is made up of water, H2O, with cells consisting of 65-90% water by weight. Therefore,

it isn't surprising that most of a human body's mass is oxygen.

Carbon, the basic unit for organic molecules, comes in second. 99% of

the mass of the human body is made up of just six elements: oxygen,

carbon, hydrogen, nitrogen, calcium, and phosphorus. You may also wish to view the element composition of

an average human body by mass.

Oxygen (65%)Carbon (18%)Hydrogen (10%)Nitrogen (3%)Calcium (1.5%)Phosphorus (1.0%)Potassium (0.35%)Sulfur (0.25%)Sodium (0.15%)Magnesium (0.05%)Copper, Zinc, Selenium, Molybdenum, Fluorine, Chlorine, Iodine, Manganese, Cobalt, Iron (0.70%)Lithium, Strontium, Aluminum, Silicon, Lead, Vanadium, Arsenic, Bromine (trace amounts)

WHY ICE FLOATSA substance floats if it is less dense, or has less mass per unit volume, than other components in a mixture. For example, if you toss a handful of rocks into a bucket of water, the rocks, which are dense compared to the water, will sink. The water, which is less dense than the rocks, will float. Basically, the rocks push the water out of the way, or displace it. For an object to be able to float, it has to displace a weight of fluid equal to its own weight.

WHY ONION 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

HOW SOAP CLEANSSoaps are sodium or potassium fatty acids salts, produced from the hydrolysis of fats in a chemical reaction called saponification. Each soap molecule has a long hydrocarbon chain, sometimes called its 'tail', with a carboxylate 'head'. In water, the sodium or potassium ions float free, leaving a negatively-charged head.Soap is an excellent cleanser because of its ability to act as an emulsifying agent. An emulsifier is capable of dispersing one liquid into another immiscible liquid. This means that while oil (which attracts dirt) doesn't naturally mix with water, soap can suspend oil/dirt in such a way that it can be removed.

DOES BOTTLE WATER GO BADAlthough bottled water has an expiration

date, it doesn't actually go bad. Why is there an expiration date on a product that doesn't go bad? This is because New Jersey requires all food and beverages, including

water, to carry an expiration date on its packaging. It doesn't matter if you don't

live in New Jersey... your water may carry an expiration date anyway to make it easier

to standardize packaging. Some bottled water only carries its bottling date or a 'best by' date. These dates are helpful

because the flavor of the water will change over time as it absorbs chemicals from its packaging. The flavor will not necessarily

be bad, but it may be noticeable.

FRUIT THAT RUIN JELL-OThe fruits that ruin Jell-O contain enyzmes called proteases which break the chemical bonds that try to form between chains of protein as Jell-O or other gelatin tries to gel.pineapple - bromelainkiwi - actinidinfigs - ficainpapaya - papainpawpaw - papainmangoguavaginger root

LAUNDRY DETERGENT IN THE DISHWASHER

Modern laundry detergents tend not to produce mountains of bubbles, but there are other good reasons to not substitute laundry detergent for dishwashing detergent. One reason is that you likely void the warranty on the appliance if you use a product not made for dishwashers. You may be exposing yourself to toxins, too. The detergent itself may be the same from one product to the other, but laundry detergents may contain brighteners, fragrances, stain removers, and anti-soiling chemicals that you don't really need volatilized by the heat of your dishwasher so that you breathe them. The ingredients in laundry detergent might not rinse completely from your dishes.

BAKING POWDER VS BAKING SODA

Both baking soda and baking powder are leavening agents, which means they are added to baked goods before cooking to produce carbon dioxide and cause them to 'rise'. Baking powder contains baking soda, but the two substances are used under different conditions.

HOW SUNSCREEN WORKSSunscreen 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 light penetrates, but not as much as if the door wasn't present. Sunblock, on the other hand, reflects or scatters the light away so that it doesn't reach the skin at all.

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