Answer:
2. ΔG is zero, ΔH is positive, and ΔS is positive
Explanation:
When the ice is being converted to water ate 0ºC and 1 atm, there is an equilibrium between the solid and the liquid. At the equilibrium point, ΔG (the free energy) is zero. It is negative for spontaneous reactions and positive for nonspontaneous reactions.
For the phase change happens, the ice must absorb heat from the surroundings, so it's an endothermic reaction, and because of that ΔH (the enthalpy) must be positive. It is negative for exothermic reactions.
In the liquid state, the molecules have more energy and the randomness is higher than the solid-state. The entropy (S) is the measure of the randomness, so if it's increasing, ΔS must be positive.
Answer: Option (B) is the correct answer.
Explanation:
Elements of a group represent similar chemical properties because they contain same number of valence electrons which determines their reactivity.
Hence, elements of a group have same chemical nature or property.
A group is represented by a vertical column in a periodic table.
On the other hand, a period is represented by a horizontal line.
Thus, we can conclude that a column contains elements with similar properties in the periodic table.
I think the answer is the number of protons.
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