If you could help, that’d be awesome. Thank you! There is a picture of the problem :)

How are isotopes of the same chemical element alike? how are they different?

What is the percentage composition of carbon in the compound ch4

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.