If the initial concentration of N2O5 ia 0.80m, what is the concentration after 5 half lives
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Darell has a home gym that his older brother set up. nobody has used the gym for a few years but darell has decided to give weight lifting a try. he talks to his gym teacher, who shows him proper form for the exercises and does performance testing. together they design a starter program that includes a warm-up, stretching, and some basic weight-lifting exercises, followed by a time of stretching. on the first day of his routine, darell is injured. what is the most likely cause of his injury?

You find a mysterious, dull substance on the ground and pick it up for a closer look. it is powdery, very light, and soft to the touch. the substance is most likely i. an organic mineral ii. a metallic mineral iii. a nonmetallic mineral i only ii only iii only i and ii i and iii

Which of these is a disadvantage of hydrogen fuel cells? a. engines that use hydrogen fuel are more efficient than gasoline-powered engines. b. the only emission produced by hydrogen fuel cells is water. c. hydrogen fuel is continually available and useful for heating. d. hydrogen fuel is often purified in a process that emits lots of greenhouse gases.