25 points each! A molecular chain of C and H atoms has the formula C20H42, has moderate viscosity, and is not soluble in water. Make two modifications to the chemical structure to achieve different physical properties. Discuss the new atoms/bonds would be present in the molecule after the change.

The first change should increase the viscosity while leaving the molecule insoluble in water.

The second change should further increase the viscosity of the substance while increasing its solubility in water.

Which of the following true? a_volcanoes and earthquakes often near the plate boundaries. b_volcanoes occur whereve there are tall mountains. c_earthquakes cause volcanoes in the same location to erupt violently d_volcanoes and earthquakes occur only where plates are colliding with each other

Why do scientists look for patterns in the world? a. patterns can explain observations. b. patterns never change, no matter what. c. patterns are easy for scientists to detect. d. patterns are all the same, through all time.

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.