Answer:
F (3.98)> O (3.44)> Cl (3.16)> N (3.04)> Kr (3.00)> Br (2.96)> I (2.66)> Xe (2.6)> S(2.58)
Explanation:
Electronegativity is described as the tendency or ability of an element to attract electron density or bond pair of electrons towards itself. It is a chemical property of an element.
In the periodic table, the least electronegative element is caesium (0.79) and the most electronegative element is fluorine (3.98).
List of 9 most electronegative elements are:
F (3.98)> O (3.44)> Cl (3.16)> N (3.04)> Kr (3.00)> Br (2.96)> I (2.66)> Xe (2.6)> S(2.58).
Answer: evaporation of water is equal to precipitation of water
Explanation:
An hydrological cycle or water cycle is the cyclic process in which the water circulates between different spheres of the earth in solid, liquid and gaseous forms. It circulates in earth's ocean or any other water body, then the vapors reach upto the atmosphere due to evaporation, where these vapors condense and precipitate into rain or snow, again it becomes part of the water body.
On the basis of the above explanation, evaporation of water is equal to precipitation of water is the correct option for the maintenance of the balance of the hydrological cycle on earth.
This type of mixture is a heterogeneous mixture. It is any mixture that is not uniform. Heterogeneous mixtures always have more than one phase.It is made up of substances which stays physically separate with each other. Best example is a mixture of sand and sugar. If you get two samples from different points of the mixture and analyze it, you will see that the concentrations of the components are different and that the two solid phases never combine with each other.
CuSO4 * nH2O ------> CuSO4 + nH2O
<span>0.866 g 0.554 g 0.312 g
1) m(H2O) = m(</span>CuSO4 * nH2O) - m(CuSO4) = 0.866 g - 0.554 g = 0.312 g
2) M(H2O) = 2*1.0 + 16.0 = 18.0 g/mol
0.312 g * 1 mol/18.0 g = 0.0173 mol H2O
3) M(CuSO4) = 63.5 + 32.1 + 4*16.0 = 159.6 g/mol
0.554 g * 1 mol/159.6 g≈0.00347 mol CuSO4
4) 0.00347 mol CuSO4 : 0.0173 mol H2O ≈ 1 mol CuSO4 : 5 mol H2O
CuSO4 *5H2O
5 molecules of water per 1 CuSO4*5H2O