Which of the following elements would displace copper from a solution of copper ions?

What is the percentage composition of carbon
in Ca(HCO3)\(_{2}\) ?
[ Ca = 40.0, 0= 16.0, C = 12.0, H= 1.0]

Which of the following bond types is intermolecular?

The maximum number of covalent bonds formed by nitrogen is

The IUPAC name of the compound CH3CH(CH3)CHCH2 is