Which action describes the amount of heat required to have the heat of fusion?

A) evaporating 1 g of liquid into a gas

B) making substance sublimate

C) making material combust

D) melting 1 g of solid into a liquid

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 the percent by mass of oxygen in fe2o3

From the choices provided below, list the reagent(s) in order that will react with cyclopentanone to form the compound shown below.