6 A student records the mass of a sample of polyvinyl chloride (PVC) as 75.23 grams. Then the student places the PVC sample into a graduated cylinder containing 25.0 mL
of water. The student reads the new volume in the graduated cylinder to be 78.0 mL. What is the percent error for
the student's density determination? The accepted value for the density of polyvinyl chloride is 1.38 g/cm3.
A 1.42%
B 2.86%
C 3.00%
D 4.00%

Based on the law of conservation of energy, which statement is false? answer- energy is lost when machines dont work right

Dying the folding patterns of protein molecules can microbiologists better understand cellular processes as well as some diseases, such as alzheimer’s, that are caused by proteins that have misfolded. the folding of these complicated molecules can be simulated on computers, but it takes a lot of processor power and time for even expensive supercomputers to do this. a group of researchers at stanford university developed software that can be used to distribute the processing of data to anyone who is willing to donate time on their idle personal computers. as a result, the researchers have been able to achieve protein-folding simulations that are far better than those other computing methods have done. which statement best describes the work of these researchers? the work is not scientific because the data are not processed in one location. the work is not scientific because the simulations are not reproducible. the researchers applied creativity to solve a problem in running an experiment. the researchers used only well-established scientific techniques.

Margaret wants to make an orange flavored drink by stirring powdered drink mix into a glass of water. she doesn't like drinks that have small clumps of powdered solid in them, so she wants the drink to be a perfect solution. what factors should margaret not consider when deciding how much powder to add to her glass of water?