If you want to prepare 5 liters of a 0.35m solution of nh4cl, how many grams of salt

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?

What three things determine the shape and size of a puddle when water is poured out onto a surface

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.