How do we use electromagnetic energy? What is the electromagnetic spectrum?

Name the only part of the electromagnetic spectrum that humans can see with the naked eye.

What are the characteristics of visible light?

Which electromagnetic wave has the longest wavelength? Describe the energy level and frequency of this wave.

Calculate the number of molecules present in 0.750 mol of mgo.

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks.energy was destroyed inside the blocks.energy was absorbed into the blocks from outside the system.energy was transferred from the warmer block to the cooler block.

What information does a complete ionic equation give that the balanced equation doesn’t show?