Which of the following statements is true?

a. compounds keep the chemical properties of the elements they are made from.
b. molecules are made of two or more atoms.
c. john dalton was the first person to propose the idea of an atom.
d. all of the above.

B.

Explanation:

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adding or remove a gaseous reactant or product changes the concentrations. if the concentration of reactant or product is increased, the system will shift away from the side in which concentration was increased (i.e. if the concentration of reactants is increased, the system will shift toward the products. if more products are added, the system will shift to form more reactants). conversely, if the concentration of reactant or product is decreased, the system will shift toward the side in which concentration was decreased (i.e. if reactants are removed, the system will shift to form more reactants. if the concentration of products is decreased, the equilibrium will shift toward the products).

explanation:

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