However, if Earth were a little closer to the Sun, its oceans would evaporate; if it were farther from the Sun, the oceans would freeze solid. [#highlight12]Because liquid water was present, self-replicating molecules of carbon, hydrogen, and oxygen developed life early in Earth’s history...
Valence bond theory is based on the assumption that the bonds formed between two molecules are localized covalent bonds. However, it also considers the electronic structure of molecules by considering the atomic orbitals of atoms. Answer and Expla...
Artist’s impression of simple and complex organic (carbon-containing) molecules that have been found in space. Credit: IAC/NASA/NOAO/ESA/Hubble Helix Nebula Team/M. Meixner/STScI/T.A. Rector/NRAO It may consist of atoms of a single chemical element, as with oxygen (O2), or of differe...
Describe the carbon cycle with appropriate formula. An alkane has 25 carbons. What is the molar mass of the substance? What is a hydrocarbon? Give some examples. Which class of hydrocarbons has a double bond in its carbon skeleton? Which of the following molecules is/are alkane? a. (I) ...
If the two atoms are the same element, it is called ahomonuclear diatomic molecule, such as oxygen (O2) and nitrogen (N2).Polyatomic moleculeshave more than two atoms, such as water (H2O) and carbon dioxide (CO2). Larger molecules are calledpolymersand may be made of thousands of atoms...
F. W: We’re trying to see the kinds of carbon molecules in which we can use silicon as a substitute. G. M: What difference would that make H. W: Silicon has a lot of the same properties as carbon, hut it’s much more common than carbon. I. M: Oh, I see.如何...
So could it be that Earth really is unique? All living things on Earth are made of the same building blocks, long carbon-based molecules.所以地球真的是独一无二的吗？地球上所有的生物都有着相同的组成成分，即长碳基分子。Scientists now think that a large proportion of these molecules came from...
The manufacture of plastic resins accounts for the highest percentage of a plastic bottle's carbon footprint. During processing, hydrocarbons in petroleum and natural gas are heated to extremely high temperatures to break down large hydrocarbon molecules into smaller ones. The small hydrocarbons are th...
that have a slightly different electronegativity. The carbon-oxygen bond is a polar covalent bond. It is still a covalent bond, but the electrons aren't shared equally between the atoms. If you are given a test question asking which type of bond carbon forms, the answer is a covalent bond...
molecules of oxygen and carbon dioxide are passively exchanged by diffusion beeen the gaseous environment and the blood. Thus the respiratory system facilitates oxygenation of the blood with a conitant removal of carbon dioxide and other gaseous metabolic wastes from the circulation. The ...