【TED】科普动画集锦 312 The big-beaked, rock-munching fish that protect coral reefs 05:05 【TED】科普动画集锦 313 The breathtaking courage of Harriet Tubman 04:49 【TED】科普动画集锦 314 Sunlight is way older than you think 04:37 【TED】科普动画集锦 315 The 2,400-year search for th...
How does an oxygen atom in the side chain affect the photophysical properties of alkoxy-substituted organopolysilane homopolymers and copolymers?doi:10.1016/S0032-3861(03)00243-XPolysilanePhotophysical propertiesAlkoxy side chainAlkoxy-substituted organopolysilane homopolymer (poly[SiMe(OR)]n) and ...
About 99 percent of your body is made up of atoms of hydrogen, carbon, nitrogen and oxygen. You also contain much smaller amounts of the other elements that are essential for life. ... The very heavy elements in you were made in exploding stars. The size of an atom is governed by th...
About 99 percent of your body is made upof atoms of hydrogen, carbon, nitrogen and oxygen. You also contain much smaller amounts of the other elements that are essential for life. ... The very heavy elements in you were made in exploding stars. The size of an atom is governed by the...
I recently stumbled across a fascinating essay on the Environmental Defense Fund website. It asks and visually answers a great question. How big is a ton of CO2? Carbon dioxide. Here’s my summary of their visualization: Picture a balloon 10 feet in diameter. ...
The number of protons present in an atom leads to the termatomic number. An atomic number 1 points out that the atom is hydrogen. Similarly, an atomic number 2 reveals helium atom. The total number of neutrons and protons, when added together, gives us the relative atomic mass. For exampl...
The red “ball” represents an oxygen atom, and the white “balls” represent hydrogen atoms. In (b), a representation of a water molecule’s molecular formula is presented. The letter “H” symbolically refers to the hydrogen atom, the number “2” refers to the number of hydrogen atoms...
Ozone is found naturally in small concentrations in the stratosphere, a layer of Earth's upper atmosphere. In this upper atmosphere, ozone is made when ultraviolet light from the sun splits an oxygen molecule (O2), forming two single oxygen atoms. If a freed atom collides with an oxogen mo...
Big objects pose a risk, too -- mop buckets, vacuum cleaners, IV poles, patient stretchers, heart monitors and countless other objects have all been pulled into the magnetic fields of the MRI. In 2001, a young boy undergoing a scan was killed when an oxygen tank was pulled into the magn...
2H2O 4 2 How many hydrogen atoms are present? How many oxygen atoms are present? 2 The easiest way to count atoms: 1. Write down all of the symbols for all of the elements present in the formula 2. If there is a coefficient, write this number next to each of the symbols 3. Multi...