SCIENCE QUIZ PLEASEEE HELP

Based on the law of conservation of energy, which statement is false? answer- energy is lost when machines dont work right

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

Which of the following natural processes is most likely to support the formation of an underwater sinkhole? a pollution buildup from deposited minerals b limestone cave collapsing due to changes in sea level c erosion of large amounts of sand moved by ocean waves d oxidation of rock formed by chemical weathering