A piece of iron is heated to 120'C then placed in a calorimeter containing 50g of water. The water temperature is raised from 30°C to 40°C. Assuming the specific heat of water is 4.18 J/8'C and the specific heat of Iron is 0.44 J/g C, what is the mass of the piece of iron?
118.8
59.45
39.6
752

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 term is missing from the central region that describes hypotheses, theories, and laws? popular predictable mathematical falsifiable

Freezing and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.