What is the name of the compound Hg2O7

Matches the chemical name of each oxide of phosphorus to its chemical formula

Which of the following elements would you expect to have the lowest ionization energy value? fluorine, lithium, neon, nitrogen

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.