Answer:
The atmosphere protects living things on earth from the sun's harmful ultraviolet radiation.
Explanation:
keeping the earth warm, the atmosphere contains gases that enable the "Greenhouse effect", (it means that they are able to trap the heat that is reflected from the surface of the earth.)
D. Should be correct- the other ones don’t make sense
Mr: 207.2
m=n×Mr= 6.53×207.2= 1353.02g
Answer:
Explanation:
To neutralize a chemical to a pH of 7 before discarding, one would require a significant amount of acids or bases. Our best guess is that the solution in itself is either an acid or a base. Neutralization with the right amount of a proper reagent can bring the pH of the solution to a neutral 7.
If the solution has a pH originally greater than 7, add a corresponding amount of acid to it. This will reduce the concentration and bring it to a neutral point. Provided one is dealing with a solution of pH less than 7, simply add a base to to bring the solution to neutrality.
The nuclear composition and electron configuration of an atom of Scandium 45 and the atomic number is 21 the most common isotype of this element is that nuclear consists of 21 protons and 24 neutrons Scandium is a transition metal group 3 period and the d-block of a periodic table
