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What a molecule is, and the difference between molecules and compounds?
A molecule is made up of two or more atoms combined chemically. The atoms can be of the same element, as in oxygen gas (O2), or two or more different elements combined, as in water (H20). By contrast, a compound is made up of two or more different elements combined.
Another way to see the distinction is that molecules represent a larger category in the classification of matter. A molecule can be any combination of two or more atoms. By contrast, a compound must be composed of at least two different elements; therefore, compounds are a subset of molecules.
What is a covalent crystal? A covalent crystal is one in which the lattice structure is held together by powerful covalent bonds. These crystals tend not to be soluble in water
COPD
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Explain the Orthopnoea and Tachypnoea Orthopnoea: Dyspnoea occurs even at rest in severe cardiac congestive failure. This condition is called orthopnoea. Tachypnoea: It is a
How do time and temperature work in soil formation? The time taken for the soil formation may be more in some cases or less in others. Hard rocks require more time as comp
Observe the surface of the moon :- Use the small telescope or a pair of field glasses. Examine the surface of the moon and see if you can see any of its craters and mountains.
What is the general statement regarding the temperature of water in oceanic depths? Commonly, the relation is this - the further from the surface the colder the water. This
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Determine about the Plant-Available Soil Moisture Plant available soil moisture or total available water is the difference between the amount of water held in the plants root
Define Precautions for Estimation of Iron in the Solution? 1. Washing of glassware for iron estimation is important. Insufficient washing for iron removal may cause fluctuation
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