Friction is a force that slows the motion between two objects in contact. Derek wants to determine how the surfaces of objects affect the amount of friction. Which of the following will help test this? Slide a wooden block across a table and then across a rug. Compare and contrast the results. Slide a wooden block across a table; slide a metal block across a rug. Compare and contrast the results.

Slide a wooden block across a table; repeat the action at a faster speed. Compare and contrast the results.

Slide a wooden block across a table; repeat the action by turning the block on its side. Compare and contrast the results.

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.

I’m an electrically neutral atomic any element, there are equal numbers of

Plzz a sample of table sugar (sucrose, c12h22o11) has a mass of 7.801 g. ● a) calculate the number of moles of c12h22o11 in the sample b) calculate the number of moles of each element in c12h22o11 (number of moles of c, number of moles of h & number of moles of o) in the sample. (use your answer from part a as your starting point.) show your work and highlight your final answer. calculate the number of atoms of each element in c12h22o11 (number of atoms of c, number of atoms of h & number of atoms of o) in the sample. (use your answers from part b as your starting for each element.) show your work and highlight your final answer.