In a chemistry course with two exams and a final, receiving 90-100% of the total points receives an A; 80-90% a B; 70-80% a C; 60- 70% a D; and below 60% an F. A student scores an 89 / 100 on the first exam, 81/100 on the second exam, and 160/200 on the third
exam. What letter grade will the student receive?
Select one:

Is this a single replacement reaction or there is no

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.

Which compounds have the empirical formula ch2o? a.c2h4o2 b.c3h6o3 c.ch2o2 d.c5h10o5 e.c6h12o6