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: a)
b)
c)
d)
Explanation:
General representation of an element is given as:_Z^A\textrm{X}
where,
Z represents Atomic number
A represents Mass number
X represents the symbol of an element
Mass number is defined as the sum of number of protons and neutrons that are present in an atom.
Mass number = Number of protons + Number of neutrons
In an atom, when neutrons or protons are lost or gains, it directly affects the mass number of an atom.
Atomic number is defined as the number of protons or number of electrons that are present in an atom.
It is characteristic of a particular element.
Atomic number = Number of electrons = Number of proton
a) Z 74, A 186:
b) Z 80, A 201:
c) Z 34, A 76:
d) Z 94, A 239.: