Answer:
chemical change
Explanation:
because physical is like if something is happening inside your body
BTW
I hope this helps
Answer:
Cu(NO3)2(aq)+Pb(s) ⇌ Pb(NO3)2(aq)+Cu(s)
Explanation:
If we look at the both reactions closely, we will quickly discover that the reaction CuSO4(aq)+Pb(s) ⇌ PbSO4(s)+Cu(s) involves PbSO4.
The compound PbSO4 is insoluble in water and sinks to the bottom of the reaction vessel. When this occurs, the concentration of Pb^2+ becomes low. This will bring about a low voltage in the cell.
On the other hand, Pb(NO3)2 is soluble in water hence the cell voltage in this case is higher than the former.
Answer:
The sum of the protons and neutrons.
Explanation:
protons + neutrons = atomic mass
Correct Answer: compound because the atoms of the elements are combined in a fixed proportion.
A. the number dots shown on the lewis dot diagrams for the element in the period
