What change causes a substance to change states of matter?
2 answers:
Answer: Option (A) is the correct answer.
Explanation:
It is known that kinetic energy is the energy obtained by an object due to its motion.
And, when we increase the temperature of a substance then there will occur an increase in the kinetic energy of its molecules.
Also, K.E =
So, kinetic energy is directly proportional to the temperature. As a result, on increasing the temperature more number of collisions will take place between the molecules.
Therefore, we can conclude that amount of kinetic energy in the substance’s particles changes its states of matter.
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Answer:
C. Arsenic
Explanation:
Each period is terminated by a noble gas with a closed valence shell with electronic configuration ns²np⁶. Since noble gases have completely filled orbitals in the valence shell and are very stable, it becomes very difficult to alter their stable arrangement by the addition or removal of electrons. They they exhibit very low chemical reactivity
Noble gas elements are: Neon, Argon, Krypton, Xenon, Radon, Helium (2 electrons in outer shell, stable).