Answer:
The process of dissolving increases entropy because the solute particles become separated from one another when a solution is formed.
Answer:
0.89 moles of N2 gas
Explanation:
From Avogadro's law:
V1/n1 = V2/n2
n2 = V2n1/V1
V1=11.2L
V2= 20L
n1=0.5 moles
n2 = ??
Therefore
n2= 20×0.5/11.2= 0.89 moles
A toxic substance<span> is a </span>substance<span> that can be poisonous or cause health effects. People are generally concerned about chemicals like polychlorinated biphenyls (PCBs) and dioxin which can be found at some hazardous waste sites.</span>
Answer:
(A) proceeding without external influence once it has begun.
Explanation:
<em>A reaction that is spontaneous can be described as</em>
<em>(A) proceeding without external influence once it has begun.</em> TRUE. A spontaneous reaction has a tendency to proceed in the way it has begun. It is spontaneous when Gibbs free energy is negative.
<em>(B) releasing heat to the surroundings.</em> FALSE. If the reaction is exothermic (enthalpy negative), one still has to take into account the effect of the entropy on Gibbs free energy.
<em>(C) proceeding in both the forward and reverse directions.</em> FALSE. This just means that the reaction is reversible.
<em>(D) increasing in disorder.</em> FALSE. This means that entropy increases but it is still necessary to take into account the effect of enthalpy on Gibbs free energy.
<em>(E) having the same rate in both the forward and reverse directions.</em> FALSE. This is related to the kinetics but not the spontaneity.
Answer: When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases.
