Which of the following allowed Fleming to recognize the pattern of the Penicillium mold killing bacteria? He was a scientist trained in the craft of scientific observation. He saw a similar pattern when he used an antibiotic to kill plated bacteria. He knew that Penicillium killed bacteria, so he was prepared to make the observation. He had previously seen a similar pattern when a tear fell on a Petri dish of bacteria.

What are transitions between a liquid and a solid called? identify which way they are transitioning

What is the chemical name of the compound na2co3? use the list of polyatomic ions and the periodic table to you answer. a. sodium carbon oxide b. sodium carbonate c. sodium(ll) carbonate d. sodium oxalate

The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.