What is the net ionic equation of 2H+ + SO42- + Ca2+ + 21 → CaSO4 + 2H+ + 21?
O A. H+ + SO42- + Ca2+ + 21 → CaSO4+H+ + 1
B. H2SO4(aq) + Cal2(aq) → CaSO4(s) + 2HI(aq)
O C. SO42- + Ca2+ → CaSO4
D. 2H+ + SO42- + Ca2+ → CaSO4 + 2H+

Three alkali metals in group 1 are a. calcium, strontium, barium b. boron, aluminum, gallium c. sodium, potassium, rubidium d. fluorine, iodine, chlorine

The reactions shown here can be combined to make the overall reaction c(s) + h2o(g) ⇌ co(g) + h2(g) by reversing some and/or dividing all the coefficients by a number. a. c(s) + o2(g) → co2(g) k=1.363×10^69 b. 2 h2(g) + o2(g) → 2 h2o(g) k=1.389×10^80 c. 2co(g) + o2 (g) → 2 co2(g) k=1.477×10^90

Ajet plane is speeding down the runway during takeoff. air resistance is not negligible. identify the forces on the jet.