If an equal number of moles of reactants are used, do the following equilibrium mixtures contain primarily reactants or products? Please note this question has 1 submission for each part. (a) HCN(aq) + H2O(l) equilibrium reaction arrow CN −(aq) + H3O+(aq) K = 6.2 10-10 products reactants (b) H2(g) + Cl2(g) equilibrium reaction arrow 2 HCl(g) K = 2.51 104 reactants products

For a: The equilibrium mixture contains primarily reactants.

For b: The equilibrium mixture contains primarily products.

Explanation:

There are 3 conditions:

For the given chemical reactions:

The chemical equation follows:

The expression of for above reaction follows:

As, , the reaction will be favored on the reactant side.

Hence, the equilibrium mixture contains primarily reactants.

The chemical equation follows:

The expression of for above reaction follows:

As, , the reaction will be favored on the product side.

Hence, the equilibrium mixture contains primarily products.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e