Which of the following is an oxidation-reduction reaction? zns(s) + 2o2(g) mc011-1.jpg znso4(s) cao(s) + h2o(l) mc011-2.jpg ca(oh)2(s) 6li2o(s) + p4o10(g) mc011-3.jpg 4li3po4(s) so2(g) + h2o(l) mc011-4.jpg h2so3(aq)

ZnS(s) + 2O2(g) → ZnSO4(s)

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me