Awindmills blades move from the blowing wind. the movement of the blades represent energy. the visible light that allows people to see where they are going describes energy

A windmill’s blades move from the blowing wind. The movement of the blades represents KINETIC energy.

The visible light that allows people to see where they are going describes RADIANT energy.

a) Energy can be categorised into two types: Kinetic and potential

Kinetic energy is the energy associated with motion or movement of any system

Potential energy is the energy stored in a system

Thus, a windmills blades move form the blowing wind, the movement of the blades represent Kinetic energy

b) Visible light falls in the electromagnetic spectrum and is composed of photons or particles of light that have a characteristic wavelength and frequency. Thus, visible light that allows people to see where they are going describes electromagnetic energy (kinetic energy).

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

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