D. thermometer. The warmer it gets, the more energy the particles gain and the more they move and 'expand', rising up the thermometer.
Water is more dense in its solid state.
This statement is true.
B. A book sitting on a shelf. The books force is going down while the shelf's force is moving up against the book at an equal force.The answer would be B.
No, it is the other way around. When an electron moves from one energy level to another energy level more distant from the nucleus, it gains, not emits energy. The closer it gets to the nucleus, the more energy it emits. If it is far from the nucleus, it gains more energy.
