Which of the following is not balanced?

2Na + Cl2 > 2NaCl
NaOH + HCl > NaCl + H20
P4 + 5G2 > 2P4G10
SnCl2 + 2 FeCl3 > 2 FeCl2 + SnCl4

pure substance: iron,copper

impure substance: water,charcoal

hope this

explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.