In 1928, sir alexander fleming was studying staphylococcus bacteria growing in culture dishes. he noticed that a mold called penicillium was also growing in some of the dishes. a clear area existed around the mold because all the bacteria that had grown in this area had died. in the culture dishes without the mold, no clear areas were present. write an "if/then" hypothesis for this observation.

The correct answer is - if mold present then it produces some chemical that kills the bacteria.

Explanation:

A hypothesis is an assumption or a guess based evidence already existed for explanation or arguing so that it can be tested.

Sir Alexander Fleming found that the bacteria around penicillium mold are dead whereas the culture dishes with no mold have no clear area of dead bacteria.

On the basis of the following evidence, one can hypothesize that If penicillium mold produce then it produces some chemical that kills the bacteria.

Thus, the correct answer is - if mold present then it produces some chemical that kills the bacteria.

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.