Which of the following reactions represents an exothermic reaction? C 2S → CS 2, ΔH = 27,550 cal 2H 2O → 2H 2 O 2, ΔH = 58 kcal C (graphite) → C (diamond), ΔH = 0. 45 kcal NH 3(g) 12. 0 kcal → ½N 2(g) 3/2H 2(g) CH 4 2O 2 → CO 2 2H 2O 212,800 cal.

Which type of reaction always has an element and a compound as reactants

How is the composition of a meteorite relevant to finding out the composition of earth's core?

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.