Which statement best describes how alkali earth metals react with water?
a. most alkali earth metals react with cold water.
b. all alkali earth metals do not react with any type of water.
c. all alkali earth metals react strongly with water at room temperature.
d. most alkali earth metals react with hot water.
i got this wrong the first time so its not c. it's a little confusing so if someone could that'd be great.
here's where i'm supposed to get my alkali earth metals - the elements in group 2 of the periodic table are named the alkali earth metals. an atom of an element in this family has two electrons in its valence shell and tends to form 2+ cations through chemical reactions. beryllium (be), which is at the top of the group, will not react with water. magnesium (mg), however, will react with hot water. the rest of the group naturally reacts with water at any temperature, hot or cold. also, these elements are much harder than the alkali metals.

The right answer is:

*Most alkali earth metals react with hot water.

I took the test and got it right!

Explanation:

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.