Answer:
is there choices you have to pick from
Explanation:
or do you have to describe a covalent bond ?
B) A chemical change because the nail reacts with water/oxygen to create rust (a type of oxide)
Answer:-
Alpha decay
Explanation:-
Uranium 238 has atomic number 92 and mass number 238.
Thorium 234 has atomic number 90 and mass number 234.
So, the change in atomic number as uranium 238 disintegrates into thorium234 = 92 – 90 = 2
So, the change in mass number as uranium 238 disintegrates into thorium234= 238 – 234 = 4
We know that when an alpha particle is emitted, the mass number decreases by 4 and the atomic number decreases by 2.
So when an atom of uranium 238 undergoes radioactive decay to form an atom of thorium-234, alpha decay has occurred.
Density is not a chemical property. It is a physical property.Electromotive force, Flammability and pH are chemical properties.