An exothermic reaction is a type of chemical reaction in which energy is released to the environment in form of heat or light. Endothermic reaction in the other hand is a chemical reaction where energy is taken from the surroundings and thus the surroundings end up with less energy than they started with. In this case; the above reaction is an Exothermic reaction (heat is being released to the surroundings).
Answer:
0.26 moles
Explanation:
Number of moles = mass/molar mass
Mass of SiO2 = 15.5g
Molar mass of SiO2 = 60.08g/mol
Number of moles = 15.5g/60.08g/mol
=0.257
= 0.26 moles
:<span> </span><span>A clastic sedimentary rock will be full of... clasts. Pieces of shells, ooids, pizoids, etc. A chemically formed sedimentary rock may have these but it will dominantly be a layered rock, you should be able to see concentric layers</span>
The charge of proton and electron is equal in magnitude that is
. The distance between electron and proton is
or
.
Force exerted on electron by proton is calculated as follows:

Here, k is Coulomb's constant,
is charge on proton,
charge on electron and r is distance between them.
Putting the values,

Now, according to second law of Newton,

Here,
is mass of electron and a is acceleration.
Also, 
Rearranging,

Thus, the acceleration of an electron in this atom is
.
It’s an acid and it’s conducive