A49.48-ml sample of an ammonia solution is analyzed by titration with hcl. it took 38.73 ml of 0.0952 m hcl to titrate the ammonia. what is the concentration of the original ammonia solution?

What is the percentage by mass of silicon (si) in iron aluminum silicate (fe3al2(sio4)3)?

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.

Which position represents spring in the southern hemisphere? a) b) c) d)