Usually with roman numerals, like iron (II) chromate
iron has a charge of 2
or manganese (IV) oxide, manganese has a charge of 4
(these are ionic compounds just to let you know)
Answer:
2H+ + 2e - ---> H2(g) is the cathode
2Cl - ---> Cl2(g) + 2e - is the anode
Explanation:
Hydrogen ion has gained two electrons, making it undergo reduction. While chlorine has lose two electrons, hence undergoing oxidation.
The correct answer is A) They all have similar chemical properties.
Explanation:
In chemistry, the periodic table organizes visually the chemical elements. In this, elements are arranged according to different features. In the case of families of the elements, these refer to elements organized in the same column, for example, elements that are in column 18 form a family called noble gases.
These elements form a family because they have chemical properties; in the case of noble gases, this includes similar reactivity and physical features such as color and odor. Besides this, the elements of one family share a similar electron configuration but not the same number of electrons. This means, from the options given the one that identifies the elements that belong to a family is "They all have similar chemical properties".
Explanation:
The given data is as follows.
Diameter of pipe, D = 0.01 m
Velocity V = 0.03 m/s
Fluid density = 36.4 
Viscosity = 0.651 Pa-s
Formula to calculate Reynold number is as follows.
Re = 
= 
= 0.01677
Since, Re < 2100. This means that the flow is laminar.
So, for laminar flow in pipes,
Darcy friction factor f = 
= 
= 3816
Thus, we can conclude that the Darcy friction factor value is 3816.
