Which of the following situations would cause the greatest increase in the motion of molecules in a system? A. The system abso
rbs 75 J of heat, and its volume is halved. B. The system releases 75 J of heat, and its volume doubles. C. The system absorbs 75 J of heat, and its volume doubles. D. The system releases 75 J of heat, and its volume is halved.
<span>The
answer is B. When the system absorbs energy, the molecules gain more kinetic energy
and hence start to move faster. Doubling the size of the system also gives
more room for the molecules to move randomly around
the system <span>before colliding with other molecules
hence increasing their motion. </span></span>
A reaction in which heat is absorbed by reactant molecules is known as an endothermic reaction. Whereas a reaction in which heat is released is known as an exothermic reaction.
When molecules are in greatest motion then they will have high kinetic energy. This energy will be released in the form of heat.
On the other hand, an increase in volume means an increase in number of molecules. Therefore, more is the number of molecules more will be the collisions.
Hence, we can conclude that situation where the system releases 75 J of heat, and its volume doubles would cause the greatest increase in the motion of molecules in a system.
Frequency is always measured in Hertz (Hz), so it can't be C. or D. anyway, but the way to work this out is to do 22 ÷ 2 to work out 11 Hz, because you work out frequency as per second. Also, the formula is f (frequency) = <span>V (velocity) / λ (wavelength). </span>
