Weight changes with location, but mass does not. True or False?

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

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

Asample of freon gas has a volume of 2.23 liters, a pressure of 4.85 kpa, and a temperature of -1.36°c. calculate the volume at a pressure of 1.38 kpa and a temperature of 5.5°c. (show work)