10 Which of these steps could be used in an investigation about the effect of gravity?
OA. testing which surface is easier to slide a wooden block across
OB. measuring the time it takes for a ball to fall a certain distance
OC. measuring the distance a toy car moves after it is pushed
OD. counting how many paper clips stick to a magnet in a chain
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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: