Experiment group 1 drinks 500 ml of coffee a day
group 2 drink 500 ml of tea a day, group 3 is a control
group. at the end of 60 days all participants' blood
pressure is tested.
write a scientific question for the experiment be sure
to include the independent and dependent variable in
your question.
what consideration do the researchers need to take in order to ensure this experiment is fair?

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.

distance, luminosity, brightness, radius, chemical composition, and temperature

the dissolution of polymer can be thermodynamically described in 2 steps.