Aparticular energy level in the hydrogen atom has e = -2.42 x 10-19 j. use bohr's model of the energy levels in hydrogen to calculate n for this level. recall that atomic number (z) of hydrogen is 1.

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.

Animals that reproduce sexually either do it through external or internal fertilization. read the following statement and decide if it is true or false. birds reproduce through external reproduction which is because the female will then be able to protect the egg.

Aliquid solution can be made select all that apply. dissolving solids into liquids, mixing liquids, dissolving gas solutes into liquids , mixing gases, mixing solids