Asap, 10. in the following diagram, what do the capital c and d represent? what do the capital a and b represent? what the lower case letter represent aa+bb⇔cc=dd, k↓eq=[c↑c][d↑d] / [a↑a] [b↑b] 12. a chemical reaction is at equilibrium, which direction does the equilibrium shift if more product is added? 13. a chemical reaction is at equilibrium, which direction does the equilibrium shift if more reactant is added? 14. the following chemical equation is an exothermic reaction: 2ko2 + h2o ⇔ 2koh + 1.5o2. if you were to cool down this exothermic reaction, in which direction will the equilibrium shift?

10. Capital C and D represent products of chemical reaction, the capital A and B represent reactants, the lower case letter represent coefficients (how many atoms or molecules in chemical reaction).
12. According to Le Chatelier's principle (if the concentration is changed, that will shift the equilibrium to the side that would reduce that change in concentration) the equilibrium shift to the left.
13. According to Le Chatelier's principle the equilibrium shift to the right.
14. According to Le Chatelier's principle (When the reaction is exothermic, heat is included as a product) the equilibrium shift to the right.

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Answer : option a) 84explanation :

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.