What should you do before you begin to plan a scientific investigation?

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

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.

What is true for a substance that releases energy