Novelty devices for predicting rain contain cobalt (ii) chloride and are based on the following equilibrium and reacts to humidity as follows:
cocl2(s) + 6 h2o(g) « cocl2·6h2o(s) dh = +25.9 kj
what color will such an indicator be if rain is imminent?
(a) purple
(b) pink
(c) clear
(d) blue
(e) need the temperature to decide

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided

How many moles of sulfuric acid (h2so4) are needed to react completely with 6.8 moles of lithium hydroxide (lioh)? 2lioh + h2so4 → li2so4 + 2h2o a. 3.4 mol h2so4b. 6.8 mol h2so4 c. 10.2 mol h2so4 d. 13.6 mol h2so4

Describe the forces both attractive and repulsive that occur as two atoms move closer together.