two batches of calcium oxide from calcium and oxygen. Batch A weighs 36.0 grams and is tested and has 25.7 grams of calcium in it. Batch B weighs 87.0 grams. According to the Law of Definite Proportions, how many grams of calcium element is in batch B

Which statement describes evidence of a chemical reaction? a) ice melting eliminate b) water boiling c) lighting a match d) grape juice freezing

What must happen before a body cell can begin mitotic cell division

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.