Balance the equations below by writing the appropriate coefficients in the blanks. 1. ___ NaNO3 + ___ PbO ___ Pb(NO3)2 + ___ Na2O

2. ___ Ca3P2 + ___ H2O ___Ca(OH)2 + ___ PH3

3. ___Fe2O3 + ___ CO ___Fe + ___ CO2

4. ___NH3 + ___ O2 ___ NO2 + ___ H2O

5. ___FeS + ___O2 ___Fe2O3 + ___SO2

6. ___ C3H6O2 + ___ O2 ___ CO2 + ___ H2O

The pressure inside a hydrogen-filled container was 2.10 atm at 21 ? c. what would the pressure be if the container was heated to 92 ? c ?

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false