chemistry

1. In the reaction 2Ca(s) + O2(g) → 2CaO(s), which species is oxidized?

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  1. Oxidation is the loss of electrons.
    Ca is zero on the left and +2 on the right. O is zero on the left and 2 on the right.
    Which element (Ca or O) lost electrons?

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  2. so the answer is O
    and how is Ca zero on the left there is a 2 in front of it?

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  3. No, No, No.
    The 2 in front of the Ca is a coefficient, not the charge. It is a zero oxidation state because it is a free element. All free elements (those not in a compound) are zero. O2 is zero for the same reason. So Ca goes from zero on the left to 2+ on the right; therefore, it had to lose two electrons to do that which makes Ca oxidized and O2 is reduced.

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  4. i understand!!!!!!! thank you so much. you are awesome

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  5. Great!

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  6. rong

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