Which of the following is the proper procedure to follow in case of a spill? a. first mark or block off the area, then clean up the spill b. mark the area and leave it as-is until it is time for routine cleaning c. notify your supervisor, and continue work as usual

Add solid urea to a beaker of water. the beaker gets very cold. is δh favorable or

The model illustrates a process by which a substance is taken up by a cell. which statements describe the process? a. the model shows the process of endocytosis. b. the process shown in the model requires energy from the cell. c. the cell membrane in the model remains intact throughout the process. d. the model shows the process of facilitated diffusion.

You have trained year for a marathon. in your first attempt to run a marathon, you decide that you want to complete this 26-mile race in 4-5 hours. a. what is the length of a marathon in kilometers (1mile= 1.6 kilometers). b. what would your average speed have to be to complete the race 4.5 hours? give your answer in kilometers per hour.