Concrete is not a compound
Answer: The rock cycle is a process in which rocks are continuously transformed between the three rock types igneous, sedimentary and metamorphic. ... If the sediments are buried under further layers of sediment, they can become lithified to produce a sedimentary rock. Magma is produced when rocks are melted. The rock cycle is a concept used to explain how the three basic rock types are related and how Earth processes, over geologic time, change a rock from one type into another. Plate tectonic activity, along with weathering and erosional processes, are responsible for the continued recycling of rocks. As the lava cools it hardens and becomes igneous rock. As soon as new igneous rock is formed, the processes of weathering and erosion begin, starting the whole cycle over again!
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<span>The answer is iron. Iron has an atomic number of 26. This means than iron has 26 protons in it's nucleus. However, not all iron atoms have the same number of neutrons. Most commonly iron has 30 neutrons, but it also has 3 other stable isotopes. The word stable is important here because unstable elements are radioactive.</span>
<u>Explanation:</u>
All hydrocarbons are considered as organic compounds. Every hydrocarbon has these two conditions, in which it is considered as a hydrocarbon, they are:
- All the compounds must have carbon and hydrogen atoms in it.
- There must be covalent bonding between hydrogen and carbon.
If these two conditions are found in any compound, then that compound is considered as a hydrocarbon.
Answer:
B. overlap of two d orbitals end to end overlap of p orbital.
Explanation:
Sigma bonds are the strongest type of bonds and they are covalent which is due to the direct or end to end overlap of orbitals. The symbol σ is used to adequately describe the bond that exists in a molecule.
In organic molecules, a single C-C bond is a sigma bond while a multiple C-C bond is composed of one sigma bond together with pi or other bonds that is a double bond has one sigma plus one pi bond, and a triple bond has one sigma plus two pi bonds.
Examples include: s-s orbital, pz-pz orbitals, dz-dz orbital and hybrids like sp-p etc.
