Chemistry for Human Life Promises and Concerns

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Elements in the Human Body
Your body is made up of chemical compounds, which are combinations of elements. While you probably know your body is mostly water, which is hydrogen and oxygen, can you name the other elements that make you... you? Question: What Are the Elements in the Human Body?

Answer: Most 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. 1. Oxygen (65%)

2. Carbon (18%)
3. Hydrogen (10%)
4. Nitrogen (3%)
5. Calcium (1.5%)
6. Phosphorus (1.0%)
7. Potassium (0.35%)
8. Sulfur (0.25%)
9. Sodium (0.15%)
10. Magnesium (0.05%)
11. Copper, Zinc, Selenium, Molybdenum, Fluorine, Chlorine, Iodine, Manganese, Cobalt, Iron (0.70%) 12. Lithium, Strontium, Aluminum, Silicon, Lead, Vanadium, Arsenic, Bromine (trace amounts)

Most of the human body consists of water, which is made from hydrogen and oxygen. The most abundant element in the body is oxygen. Steve Allen, Getty Images
This is the elemental chemical composition of the average adult human body. Water is the most abundant chemical compound in living human cells, accounting for 65-90% of each cell. Each water molecule consists of two hydrogen atoms bonded to one oxygen atom, but the mass of each oxygen atom is much higher than the combined mass of the hydrogen. All organic compounds contain carbon, which is why carbon is the second most abundant element in the body. Six elements account for 99% of the mass of the human body: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. Although aluminum and silicon are abundant in the earth's crust, they are found in trace amounts in the human body. Reference: Chang, Raymond (2007). Chemistry, Ninth Edition. McGraw-Hill. pp. 52. Elements in the Human Body

Element| Percent by Mass|
Oxygen | 65|
Carbon| 18|
Hydrogen | 10|
Nitrogen | 3|
Calcium | 1.5|
Phosphorus | 1.2|
Potassium | 0.2|
Sulfur| 0.2|
Chlorine | 0.2|
Sodium| 0.1|
Magnesium | 0.05|
Iron, Cobalt, Copper, Zinc, Iodine | <0.05 each|
Selenium, Fluorine | |

Chemistry of Love

The emotions that you feel are a result of chemical messengers, primarily neurotransmitters. Love, jealousy, envy, infatuation and infidelity all share a basis in chemistry.

Question: Is There Really a Chemistry of Love?
Answer: I don't think there are any magic love potions that you can use to make someone fall in love, but chemistry does play an important role in how a relationship progresses. First, there's attraction. Nonverbal communication plays a big part in initial attraction and some of this communication may involve pheromones, a form of chemical communication. Did you know that raw lust is characterized by high levels of testosterone? The sweaty palms and pounding heart of infatuation are caused by higher than normal levels of norepinepherine. Meanwhile, the 'high' of being in love is due to a rush of phenylethylamine and dopamine.

Why Onions Make You Cry
They sit there, so harmless-looking on the kitchen counter. Yet as soon as you cut an onion, the tears begin to fall. What is it in onions that makes them burn your eyes? Pest control
It's easy to make your own natural mosquito repellent. You can control exactly what goes into the product so you won't need to worry about any unwanted chemicals. Natural Mosquito Repellent Safety

There are a couple of different formulations you can make for your natural mosquito repellent. In general, what you are doing is diluting an essential oil that the mosquitoes find distasteful or which confuses them so they can't find you to bite you. The oils don't mix with water, so you'll need to add them to other...
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