The similarities of physical and chemical changes is that both of those changes change the way the object looks by it's physical appearance. Also they use a type of element to change that object.
A. dose
a dose is an amount, a response is an action, and pollutant and toxins are substances
there are 6 moles of oxygen in Zn(No3)2
Answer:
Aluminum had more value than gold in the 1820s, because it was harder to obtain. Hope this helped :)