Question

3 pts Question 2 The chemical equation for calcium oxide and calcium carbonate equilibrium is described below. CaO + CO3(x)= CaCO3(9) AH° = -176 Predict how the following changes would shift the equilibria. Be sure to start by writing the equilibrium (K) equation Increased carbon dioxide concentration Choose ] equilibrium will shift to the left equilibrium will shift to the right equilibrium will be unaffected Increased partial pressure of carbon dioxic [Choose) One half of the calcium carbonate is removed [Choose Total pressure is decreased [Choose Catalyst is added Choose Temperature is increased 1.5 pts

Answer 1

Increased carbon dioxide concentration -- On increasing CO2 concentration , reaction moves in forward direction. Equilibrium shifts towards right.

According to Le Chatelier's principle if a system at equilibrium is subjected to a stress then the system behaves in such a way so as to reduce the stress. Effect of temperature When temperature is increased then reaction shifts in that direction which absorbs heat and reduces temperature. In an exothermic reaction when temperature is increased then reaction shifts towards left direction and vice versa. In an endothermic reaction when temperature is increased then reaction shifts in right direction. Effect of pressure When pressure increases volume decreases hence no. Of moles increases and reaction shifts in such a direction so as to reduce the number of moles i.e reaction shifts towards that side which have lesser no. of moles. Concentration : When concentration of product increases then reaction shifts towards product side and vice versa. When concentration of reactants increases then reaction shifts towards product side and vice versa. Catalyst: No effect on equilibrium.

Increased partial pressure of carbon dioxide -- On increasing CO2 partial pressure , reaction moves in forward direction. Equilibrium shifts towards right.

One half of CaCO3 is removed -- On decreasing CaCO3 concentration , reaction moves in the forward direction. Equilibrium shifts towards right.

Total pressure is decreased -- on decreasing pressure , volume increases and number of moles decreases and reaction moves in that direction which has greater number of moles. Reaction moves in backward direction. Equilibrium shifts towards left.

Catalyst is added -- No effect on equilibrium.

Temperature is increased -- On increasing the temperature , reaction moves in the backward direction. Equilibrium shifts towards left.