Bethany has a fish tank at her house. she uses the following data table to keep track of the nitrate and phosphate levels in the tank.

month nitrates phosphates
january 8.0 mg/l 0.010 mg/l
february 8.1 mg/l 0.010 mg/l
march 7.9 mg/l 0.009 mg/l
april 9.2 mg/l 0.012 mg/l
may 9.7 mg/l 0.020 mg/l
june 9.9 mg/l 0.029 mg/l
july 10.6 mg/l 0.032 mg/l
august 10.8 mg/l 0.038 mg/l
september 11.0 mg/l 0.036 mg/l

bethany notices that the fish tank is gradually filling with algae. based on the data she has collected, when did the problem most likely start? explain.

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

What is the mass of each element in a 324.8 sample of co2

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?