Acook heats a meal in a microwave oven. what energy transformations occur between the microwave oven and the meal?

a) electrical energy → light energy → chemical energy

b) chemical energy → thermal energy → light energy

c) electrical energy → electromagnetic energy → thermal energy

d) chemical energy → electromagnetic energy → chemical energy

The answer is; C

It begins with electrical energy when the microwave is connected to a power outlet. The electrical energy changes to electromagnetic energy as the microwave releases microwave radiation that hits the food in the microwave. When the microwave’s electromagnetic radiation hits the food, the water molecules in the food get excited and the food heats up turning  to thermal energy.

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.