during science lab, some students added small pieces of magnesium ribbon to 10 ml of hydrochloric acid. they noticed that bubbles formed, the test tube got hot, and the magnesium disappeared.
which is a sign that a chemical reaction has taken place in this experiment?

Which statement is true about the part of the electromagnetic spectrum that human eyes can detect? it contains only the colors of the rainbow and television waves. o it is divided into seven ranges of wavelengths. it contains ultraviolet, visible, and infrared light. it is divided into nine ranges of wavelengths.

Describe the particles of all three phases of matter in the root beer float. (how are the particles arranged and moving? )

Suppose you have designed a new thermometer called the x thermometer. on the x scale the boiling point of water is 129 ? x and the freezing point of water is 13 ? x. part a at what temperature are the readings on the fahrenheit and x thermometers the same?