A. Flueorescece. <span>The light from these ultraviolet lamps reacts with the chemicals of a mineral and causes the mineral to glow.
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Some physical properties that a pencil would have is, color, density, texture, hardness (in this case the lead is soft). phase (liquid,solid gas), shape, size. physical properties describe the look and feel of a substance. I hope this helps
19) it's not balanced because when adding h2 and o2 u get h2o2 not h2o
20) I'm not sure
Example of correct chemical formula is Al2O3
Explanation
Al2O3 is correct because Aluminium (Al) has a valence of three(3) while oxygen(O) has a valence of two (2) . when writing a chemical formula one start with cation(POSITIVELY CHARGED) symbol followed by anion symbol (negatively charged). The valence number are interchanged between cation and anion and are then written as subscript.
