An engine, such as the one in a car, converts the chemical energy in gasoline to mechanical energy when the engine moves. Not all of the energy in the gasoline is converted to the movement of the engine. Some energy is lost to sound and heat. Which of the following shows how the energy input and output of an engine demonstrate the law of conservation of energy?

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.

1. true or false: minerals are inorganic. true false 2. inorganic means that something has never been found alive 3. halite is another name for and is a mineral with a cubic crystal pattern. table salt rock salt

Stoichiometry- i need with 14 and 15! an explanation would be appreciated!