Why are there often holes in slices of bread? The holes are created by bubbles of carbon dioxide gas (CO2) that form in the bread dough before and during baking. These bubbles form when single-celled organisms called yeast break down glucose (C6H12O6), a sugar in flour. In addition to carbon dioxide gas, a substance called ethanol (C2H6O) forms during this process. In the chemical reaction described in the passage, which of the following are reactants?

Which of the following best describes the formation of plasma?

Maria wants to determine which type of disinfectant kills the most bacteria. which of the following is the best way for maria to determine this? a. ask ten different companies that make disinfectants which type is best. b. put the same amount and species of bacteria on ten identical plates, and add ten different kinds of disinfectant to each plate. c. interview ten different people to determine which type of disinfectant they prefer. d. put the same amount and species of bacteria on ten identical plates, and add a different disinfectant to each plate.

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next