(EASY CHEMISTRY) Who knows what to write on the side and how you know if the mass is conserved

Different isotopes indicate that an element will have different numbers of

How much would the freezing point of water decrease if 4 mol of sugar were added to 1 kg of water(k=1.86 c/mol/kg for water and i=1 for sugar

For each of the compounds below, show that the charges on the ions add up to zero. a. kbr b. cao c. li(2)o d. cacl(2) e. alcl(3)