Arubber balloon is rubbed with a pvc pipe and the rubber balloon becomes positively charged. why is this? a) because the rubber balloon gained protons from the pvc pipe. b) because the rubber balloon gained electrons from the pvc pipe. c) because the rubber balloon lost protons to the pvc pipe. d) because the rubber balloon lost electrons to the pvc pipe

d)

Explanation:

Electrons are lost or gained when the ballon is rubbed with a PVC. As the rubber ballon lost electrons, it will have more protons, hence the positive charge. (More protons than electrons in the ballon).

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.