Wow, now this one is a hard one, took me quite a while to figure it out but here it is:
The abundances of the two isotopes is:
Antimony-121 = 57.2%
Antimony-123 = 42.8%
Answer:What happens to the temperature of a substance during a phase change? Why does this happen?
Explanation:During a phase change the temperature remains constant. This is because the heat supplied to change the state of matter is used in breaking the intermolecular forces and other attractive forces. Therefore, the temperature remains constant as no heat is absorbed or released.
Answer:
The strong acid reacts with the weak base in the buffer to form a weak acid, which produces few H+ ions in solution and therefore only a little change in pH.
Explanation:
When a strong acid is added to the buffer, the acid dissociates and furnish hydrogen ions which combine with the conjugate of the weak acid, forming weak acid. The weak acid dissociates to only some extent and can furnish only some protons and there is no significant change in the pH.
Hence, option B is correct.
I will research it and let you know if i find anything useful!
it represents a physical change. it is not a chemical change because its chemical formula does not change unless combustion is involved.
