# Which of the following changes would decrease the rate at which a solid solute dissolves in a liquid solvent?

Decreasing surface area Explanation:

additional heat to an exothermic reaction 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. 1. Addition of  a catalyst Role of catalyst is to attain the equilibrium quickly without disturbing the state of equilibrium. Hence, addition of catalyst will not change the equilibrium of the reaction.   2. increasing the concentration of reactants If the concentration of reactants is increased so according to the Le-Chatelier’s principle, the equilibrium will shift in the direction where decrease of concentration of reactants take place. Therefore, the equilibrium will shift in the forward direction and rate will increase. 3.  decreasing the concentration of products If the concentration of products is decreased, so according to the Le-Chatelier’s principle, the equilibrium will shift in the direction where increase of concentration of products take place. Therefore, the equilibrium will shift n the forward direction   and rate will increase. 4. additional heat to an exothermic reaction If the temperature in the exothermic reaction is increased, according to the Le-Chatlier’s principle, the equilibrium will shift in the direction where the extra heat gets consumed that is in the direction of endothermic recation. Thus the equilibrium will shift in backward direction and rate will decrease.Therefore, the equilibrium will shift in the left direction and thus the rate will decrease.

Option (B) is the correct answer. Explanation: When we dilute the vinegar then there will be a decrease in vinegar particles. That is, there will be decrease in number of solute particles in the solvent. Hence, there will be less number of collisions between the vinegar and sodium hydroxide. Therefore, there will be a decrease in rate of reaction. Thus, we can conclude that out of the given options diluting the vinegar  would decrease the rate of a reaction between vinegar and sodium hydroxide, is the correct option.

b. a decrease in investment spending Explanation: because if the government doesn’t spend money in infrastructure, business training programs, TIC’s, operational expansion of public entities, strengthening of technologies and programs that encourage the productivity the GDP will decrease, in consequence,  the equilibrium output will decrease too, also, the reduction of taxes and import tariff can incentive the production in a country and those are investments that the government must do to strengthen the economy.

Decreasing surface area of the solid in the liquid. Explanation: I don’t know how to explain this without using. an example. So, here it is: If you were dipping bread in water, the bread would be completely soaked if you dipped the whole thing, but if you only allowed one part of the bread to be in the water, it would take longer for the water to soak all the way into it. The amount of surface area that is allowed to touch what is making the solid dissolve determines how quickly the whole thing will be dissolved.