1.In making your own culture media, state a good reason why you cooled the melted agar to 45ºC before pouring into the empty petri dishes. 2.What is a pure culture? How do you prove that a culture is pure? 3.What is the difference between an axenic culture and a pure culture?

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled

The amount of iron in ore can be quantitatively determined by titrating a solution of the unknown with a standard solution of dichromate, cr2o72−. the net ionic equation is 6fe2+(aq)+cr2o72−(aq)+14h+(aq)→6fe3+(aq)+2cr3+(aq)+7h2o(aq) part a the titration of 25.0 ml of an iron(ii) solution required 18.0 ml of a 0.230 m solution of dichromate to reach the equivalence point. what is the molarity of the iron(ii) solution?

Watch the video to learn about the process of hydrogen bonding. hydrogen bonding is a type of intermolecular force that exists between polar covalent molecules, one of which has a hydrogen atom that is bonded to a small and extremely electronegative element, specifically an n, o, or f atom, on the other molecule. hydrogen bonding is a subset of dipole-dipole forces.