Question

1. complete the reaction for magnesium combines with oxygen by balancing the equation with coefficients.

mg + o₂ → mgo
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Explanation:

Step1: Balance oxygen atoms

On the left, \( O_2 \) has 2 O atoms. On the right, \( MgO \) has 1 O atom. So we need 2 \( MgO \) to balance O: \( Mg + O_2 \to 2MgO \)

Step2: Balance magnesium atoms

Now right has 2 Mg, so left needs 2 Mg: \( 2Mg + O_2 \to 2MgO \)

Answer:

2 Mg + 1 O₂ → 2 MgO (So the coefficients are 2, 1, 2)