# Hello there! I think I would need some help for this one. Can you try helping me out please ? Thanks!

Aug 21, 2017

These are just terms you'll have to remember:

25) The heat content $q$ of a system at constant pressure, ${q}_{P}$, is the change in enthalpy, $\Delta H$:

${q}_{P} = \Delta H$

26) The ability to do work is a common definition for energy. We exert energy to push something forward, and hence, our ability to do work on the surroundings requires energy.

27) Disorder, or the more modern definition, energy dispersal, is associated with entropy. It is the extent to which a system can spread out its energy, and is proportional to the amount of motion in the system.

28) Energy of motion... well, "kinetic" means "relating to or resulting from motion" (see google!), so it is kinetic energy $K$, given by:

$K = \frac{1}{2} m {v}^{2}$

and it can be seen that $v$, speed, directly relates to motion.

29) The study of changes in energy during chemical reactions or changes of state pertains to heat-related stuff, and to chemistry stuff, so it pertains to thermochemistry.

30) The amount of heat required to raise $\text{1 g}$ of water by ${1}^{\circ} \text{C}$ is the calorie, i.e. a $\text{cal}$. Not to be confused with the $\text{Cal}$, where $\text{1 Cal}$ $=$ $\text{1 kcal}$.

(The extent to which this heat affects the $\text{1 g}$ of stuff is described BY the specific heat capacity, but the amount of heat needed for $\Delta T = {1}^{\circ} \text{C}$ is $\text{1 cal}$.)