How did the change of stress (adding or removing reactants or products) cause a shift in the equilibrium system of your solutions? Use data to support your answer. Make sure you discuss all four stress changes:
Adding a reactant
Adding a product
Removing a reactant
Removing a product

Adding a reactant will shift the reaction towards the products.

Adding a product will shift the reaction towards the reactants.

Removing a reactant will shift the reaction towards the reactants.

Removing a product will shift the reaction towards the products.

Explanation:

Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.

Adding a reactant will increase the concentration of reactants and hence the reaction will try to undo the increase by shifting  the reaction towards the products.

Adding a product will increase the concentration of products and hence the reaction will try to undo the increase by shifting the reaction towards the reactants.

Removing a reactant will decrease the concentration of reactants and hence the reaction will try to undo the decrease by shifting  the reaction towards the reactants.

Removing a product will decrease the concentration of products and hence the reaction will try to undo the decrease by shifting  the reaction towards the products.

Adding a reactant  - shift towards product

Adding a product  - shift towards reactant

Removing a reactant  - shift towards reactant

Removing a product- shift towards product

Explanation:

a)Reactant added – When a reactant is added to a chemical reaction which has not yet reached the equilibrium, then the added reactant is partially consumed and the reaction shifts towards the product. However, there is no effect on the K value

b)Adding a product – When a product is added, then it is partially consumed and the reaction shifts towards the reactant. Again, there is no change in K value.  

c)Removing a reactant – The reaction will shift towards the reactant

d)Removing a product- The reaction will shift towards the product

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.