Surface Chemistry and Nanoparticles Quiz

<p>The representation of enthalpy or heat of adsorption</p> Signup and view all the answers

<p>Exothermic reaction, where ΔH0 &lt; 0</p> Signup and view all the answers

<p>Adsorption in surface chemistry refers to the accumulation of species on a higher concentration on the surface of a substance due to intermolecular force. An example of this phenomenon is the adsorption of gases such as H$_2$, O$_2$, N$_2$ on the surface of activated charcoal.</p> Signup and view all the answers

<p>The enthalpy of adsorption is the amount of heat energy liberated when one mole of gas is adsorbed on the unit surface area of adsorbent. It represents the heat released or absorbed during the adsorption process. In most cases, adsorption is an exothermic process, making it thermodynamically favorable.</p> Signup and view all the answers

<p>The Van't Hoff equation represents the thermodynamic relationship between the equilibrium constant of a reaction and the temperature. In the context of enthalpy of adsorption, it relates the change in equilibrium constant to the change in temperature through the equation $\frac{d(lnK_p)}{dT} = \frac{\Delta H^0}{RT^2}$.</p> Signup and view all the answers

<p>In an endothermic reaction, the enthalpy change ($\Delta H^0$) is greater than 0, leading to a positive right-hand side of the Van't Hoff equation. This implies that the natural logarithm of the equilibrium constant increases with increasing temperature. Conversely, in an exothermic reaction where $\Delta H^0$ is less than 0, the right-hand side of the equation becomes negative.</p> Signup and view all the answers

<p>Surface chemistry contributes to surface engineering by providing insights into the chemical phenomena occurring at the interface of surfaces. Some of the phenomena taking place on the surface of substances include adsorption, catalysis, corrosion, and crystallization.</p> Signup and view all the answers