Answer:
The temperature at which the given substance starts to boil is called boiling point.
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Answer:
A
Explanation:
Argon has 17 protons and 18 neutron
atomic number is the same as the protons number.
It would be an physical change ; if you melt butter the butter goes from a solid to a liquid so therefore the physical state is changed.
Answer:
There are 3 significant figures on this one.
