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A stopwatch is a timepiece designed to measure the amount of time that elapses between its...

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Benzene is an organic chemical compound with the molecular formula C6H6. The benzene molec...

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A microscope (from Ancient Greek μικρός (mikrós) 'small' and σκοπέω (skopéō) 'to look (at)...

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Urea, also called carbamide (because it is a diamide of carbonic acid), is an organic comp...

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Urea, also called carbamide (because it is a diamide of carbonic acid), is an organic comp...

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A Petri dish (alternatively known as a Petri plate or cell-culture dish) is a shallow tran...

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Sodium nitrate is the chemical compound with the formula NaNO 3. This alkali metal nitrate...

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Phthalaldehyde (sometimes also o-phthalaldehyde or ortho-phthalaldehyde, OPA) is the chemi...

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Humic substances (HS) are colored relatively recalcitrant organic compounds naturally form...

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