Firstly, the chemical equation between the calcium metal and water will be:
Ca(s) + 2 H₂O(l) → Ca(OH)₂(aq) + H₂(g)
We can see from the equation the bubbles of hydrogen gas which are formed during the reaction stick to the surface of the metal and hence calcium floats on water.
The other metal that will float on the water during the reaction is magnesium which have the same chemical behavior like calcium, we can illustrate that by the chemical equation:
Mg(s) + 2 H₂O(l) → Mg(OH)₂(aq) + H₂(g)
When you wake up early, and go brush your teeth the toothpaste is made of chemical compounds, the water that you use to wash your faceis treated chemically. To make the coffee sugar or sweetener has chemical compounds.
Neon and helium both have full valence shells. This means that the out-most electron shell of the atom is full. In neon, the valence shell is 8 electrons, represented by the number of atoms in the family. In helium, the valence shell is only 2 electrons, which is what it has.
It's atomic mass is 1 .00794u and H is the symbol
Molarity, M = (n x 1000) / vol (in ml)
M = 17.2 x 1000/ 2000
<u>M = 8.6 mol/L</u>