Both NaCl and CaO crystallize in the same lattice structure. Account for the following: The melting point of CaO is 2899°C while that of NaCl is 800°C. Mark all of the following that contribute to this difference in melting points.
Calcium ion has a larger charge than sodium ion.
The ionic radius of chloride ion is larger than an oxide ion.
NaCl has a higher molar mass than does CaO.
Oxide ion has a larger charge than chloride ion.
Calcium ions and sodium ions have similar ionic radii.
i think its the 1st 2nd and 4th but im not sure
2006-10-30 11:02:30 · 0 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Right 1st, 2nd and 4th are the right answers.
Molar mass of NaCl equals 58.5 g/mol and molar mass of CaO equals 56, but both CaO and NaCl are ionic substances, so the molar mass doesn't determine their melting points.
Ionic radius of Ca2+ is greater than ionic radius of Na+.
2006-10-30 11:14:55 · answer #1 · answered by Dimos F 4 · 0⤊ 0⤋