Question

Define mass number.
2--- STATE WHETHER THE FOLLOWING CHANGES ARE PHYSICAL OR CHEMICAL:
i) Carbon cycle
ii)magnetisation of soft iron bar
iii)addition of dilute sulphuric acid to iron

Answer 1

mass no is the sum of nuetrons and protons
a)chemical
b)physical
c)chemical

Answer 2

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1) Mass Number
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Mass no. of an atom / molecule is the mass compared to as how many times an atom of that element is heavier than an atom of hydrogen .

2) i. Chemical change
ii. Physical change
iii) Chemical change

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