PLEASE HELP! 20 grams of a radioactive substance has a half life of 30 days

how much will be left after 150 days?

-1.25g

-2.50g

-0.63g

-0.31g

Name the element in group 17, period 2. (periodic table)

1) describe the physical layout of the ocean floor ? 2) explain how the dumbo octopus swims differently than other octopus species and why this would be an advantage in the aphonic zone . 3) why are the types of organisms that live at each underwater hot vent so dramatically different ?

Select the most likely product for this reaction: koh(aq) + co2(g) – ? k2co3(aq) + h2o(1) k(s) + h2(g) + o2(g) k(s) + co3(9) +h2