If 3.125% of a sample remains how many half lives have passed

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

The diagram below shows a cell placed in a solution. a cell is shown placed inside a beaker. it is labeled cell. the solution inside the beaker is labeled 40% salt solution and the solution inside the cell is labeled 20% salt solution. only water is allowed to move in and out of the cell. what will most likely happen to the cell? it will expand as water moves out of it. it will shrink as water moves out of it. it will expand as water moves into it. it will shrink as water moves into it.

How many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work