5. What is meant by the term melting point? The temperature at which a solid is changed into a liquid. The temperature at which a liquid is changed into a gas. The temperature at which gas is changed into a solid. The temperature at which water turns into Ice.​

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

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.

The sum of the oxidation numbers in a neutral compound is always