An oxidation-reduction reaction is a reaction in which oxidation numbers change. Oxidation involves the loss of electrons while reduction is the gain of electrons . In the reaction above; Chlorine undergoes reduction, and is therefore, the oxidizing agent, while Mg undergoes oxidation and is therefore the reducing agent.
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streak refers to the way light is reflected bya mineral.
There are 2 different types of atoms there, that's why
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You find the molar mass of calcium metal, it is listed as 40.1⋅g⋅mol−1 . You should check your copy of the Periodic Table to see if I have got it right. This means that Avogadro's number of calcium atoms, i.e. 6.022×1023 individual calcium atoms have a mass of 40.1⋅g .
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