U will be marked as Brainliest if u solve ex 1 only ​

You can look at the charge of the molecule.

mg has a +1 charge so the oxidation numbrr for Mg = +1.

For Fe2O3 the total charge is 0. This means the charges of the Fe and the O needs to be equal. O has an oxidation number of -2. You got O3 so 3 x -2 = -6. You got Fe2 so -6 / 2 = -3. Oxidation number of O = -2 and for Fe = -3.

The if you go to the rightbof the reaction you got 3 MgO. O had an oxidation number of -2. The total charge of the molecule is 0 zero, so Mg should be +2.

Mg on the left of the equation has a oxidation number of +1, and on the right +2. The number changed, so it's a redox reaction.

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.