What are the controlled, independent, and dependent variables of this experiment?
The experiment is to drop 2 drops of food coloring in one glass of hot water, and one of cold water to see which has the faster rate of diffusion.

controlled: 2 drops of food coloring

independent: temperature of water

dependent: rate of diffusion

Explanation:

A controlled variable doesn't change throughout the whole experiment, a independent variable is something being tested, and a dependent variable is the results

water is used to store them because it would keep the radiation from getting out in the open and causing harm to the workers

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.