A student finds the mass of an empty flask to be 25.631 g. After the flask is filled to the halfway mark with distilled water at 22.0 ˚C (d = 0.99777 g/cm3), the mass of the flask and water is 35.432 g. The student then forms a solution by adding some sodium hydroxide pellets and stirring the flask’s contents until the pellets dissolve. The mass of the flask, and its contents, is now 36.138 g, but the volume remains the same, still at the halfway mark. What is the density of the sodium hydroxide solution?

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? a. the wings are analogous structures that evolved differently and do not have a similar internal structure. b. the wings are homologous structures that evolved differently and do not have a similar internal structure. c. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. d. wings of bats are vestigial structures, but the wing structures of birds are not vestigial

Anurse used a 0.02-mg/l solution of disinfection to clean a patients wound. what is the concentration of the solution expressed as a percentage?

Asuspension of yeast cells is being grown under anaerobic conditions such that glucose is degraded to ethanol and carbon dioxide. if one wishes to follow this process by monitoring the release of 14co2, at which positions in the glucose molecule would the 14c label need to be incorporated?