Which of the following are balanced equations? Check all that apply. A. Zn(s) + HCl(g) → ZnCl (s) +H (8)

B. 2Na(s) + MgF2 → 2NaF(s) + Mg(s) +

c. Na(s) + MgF2 → 2NaF(s) + Mg(s) 2

D. 4Na(s) + O2(8) ► 2NaO

Nitric oxide (no) can be formed from nitrogen, hydrogen and oxygen in two steps. in the first step, nitrogen and hydrogen react to form ammonia: n2(g) + 2 h_2(g) rightarrow 2 nh_3 (g) delta h = -92. kj in the second step, ammonia and oxygen react to form nitric oxide and water: 4 nh_3(g) + 5 o_2(g) rightarrow 4no(g) + 6 h_2o(g) delta h = -905. kj calculate the net change in enthalpy for the formation of one mole of nitric oxide from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .

Asmall amount of a solid is added to water. the observation made after fifteen minutes is shown in the figure. which of these solids has been probably added to water? a) oil b) sand c) sugar d) wood chips

How have the greenhouse gasses increased from the year 2000 to 2018