Which of the following reactions in a redox reaction? a
2 Mg(s) + O2(g) → 2 MgO(aq)

b
HCl(aq) + NaOH(aq) → H2O(l) + NaCl(aq)

c
Pb(NO3)2(aq) + KCl(aq) → PbCl2(aq) + KNO3(aq)

d
CaCO3(s) → CaO(s) + CO2(g)

Determine the mass of fuel required for the expected energy consumption in the united states for the next ten years. energy use per person per year in the united states = 3.5 x 1011joules base calculations on current population of 310,000,000.

In a ni-cd battery, a fully charged cell is composed of nickelic hydroxide. nickel is an element that has multiple oxidation states. assume the following proportions of the states: nickel charge proportions found 0 0.17 +2 0.3 +3 0.33 +4 0.5 (a) determine the mean of the nickel charge. enter the answer to 2 decimal places.(b) determine the cumulative distribution function of nickel charge.

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule