Cu 2+ is blue. Cu2O is reddish; CuO is black, I think.
A brown... look at a penny.
The colour of silver metal in water is whiteThe colour of copper nitrate in water is blue (due to the Cu++ ion).
Most likely copper.
+2 or +1 (For copper ion)
It starts a reaction
copper, Cu+ ,cuprous ion
Flame colours depend on just the metal ion. All copper compounds give the same colour, green.
The colour of silver metal in water is whiteThe colour of copper nitrate in water is blue (due to the Cu++ ion).
Most likely copper.
Anhydrous copper(II) sulphate is white. When added to water, it forms a solution of CuSO4(aq) which is blue because of the Cu2+ ion, which is itself a transition metal ion.
Copper is a monatomic ion.
Sodium ion is colorless.
No
no
The number of electrons for copper positive 1 ion is 28.
Copper and carbonate ions form copper carbonate. In practice, copper carbonate usually contains hydroxide ions as well.
Copper metal "dissolves" in nitric acid (HNO3). Actually, the nitrate ion oxidizes the copper metal to copper (II) ion while itself being transformed to NO2 gas in the process; the copper (II) ion then binds to six water molecules.
+2