Okay, let's take the basics:
There is no such thing as "copper sulfate baking powder", as it would be poisonous.
I can think of no way to relate elemental nickel to the fictitious "copper sulfate baking powder".
Nickel cannot replace copper in copper II sulfate because nickel is higher in the electromotive series than copper.
Mercury, Iron or Nickel will not replace copper in a reaction between copper II sulfate and the metals because the metals are below copper in the reactivity level of the periodic table.
Nickel sulfate is an ionic compound though it has covalent bonds within the sulfate ion itself.
nickel (ll) sulfate heptahydrate
Stannous sulphate: SnSO4 Nickel sulphate: NiSO4.6H2O
It is made of copper and nickel. A 1949 NICKEL is made from copper & nickel.
The compound NiSO4 7H2O is magnesium sulfate heptahydrate. It is a type of inorganic salt that is commonly known as Epsom salt.
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nickel and copper are elements that can be magnetized
Depending on the country, coins can be made out of various combinations of copper, nickel, steel, zinc, aluminium, manganese, and other metals. Copper, nickel, and steel are the most common.
The net ionic equation for this process is: Ni(s) + Cu(+2)(aq) --> Ni(+2)(aq) + Cu(s). This is an oxidation-reduction reaction, where nickel is oxidized and copper is reduced.
Both nickels and dimes are composed of Copper and Nickel. A dime, however, is 91.67% Copper and 8.33% Nickel, while a nickel is 75% Copper and 25% Nickel. Since Copper is a bit denser than Nickel, and a dime contains relatively more Copper, than a dime would be denser than a nickel.