19. A piece of unknown metal with a mass of 62.0g and an initial temperature of 95.3°C is dropped into 100.0g of water with an initial temperature of 27.0°C. The final temperature of the system is 34.0°C.

Energy is released during which phase changes? check all that apply. boiling condensing depositing freezing melting subliming

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

Which of the following units is not an official si unit