A sample of gas y occupies 500 L at the pressure of 80 KPa. after changing the volume of the sample the pressure of it is 400 KPa what is the new volume of the gas?

C3h8o3 - glycerol major species present when dissolved in water

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

What is a number added in front of a formula in order to balance the equation