[gradpoint-question ak-4] which equation represents a combustion reaction?

a: ca + 2h cl > cacl₂ + h₂
b: pb(no₃)₂ +2hcl > pbcl₂ + 2hno₃
c: 2so₂ + o₂ > 2so₃
d: 2c₂h₆ + 7o₂ > 4co₂ + 6h₂o

this question is worth 40 points. so answer carefully. i'm bad at chemical equations.

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks.energy was destroyed inside the blocks.energy was absorbed into the blocks from outside the system.energy was transferred from the warmer block to the cooler block.