ASAP. Which pair of elements will form an ionic bond. 1. carbon and oxygen

2.carbon and chlorine

3.nitrogen and oxygen

4.barium and chlorine

PLEASE HELP

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

The lattice enthalpy (formation of ionic solid from ions in the gas phase) for agcl(s) is -916 kj/mol and the hydration enthalpy (dissolution of gaseous ions into water) is -850 kj/mol. how much heat (in joules) is involved in forming 1l of saturated agcl solution (1.8 × 10-4 g / 100 ml water) by dissolving agcl(s)? assume solution volume does not change much upon dissolution. the equations are given below. ag+(g) + cl−(g) æ agcl(s)

What is the solubility-product constant of barium sulfate, baso4, if a saturated solution is 1.03 ´ 10-5 m?