An ice cube is placed in 80 mL of 70oC water. When the ice melts the temperature of the water is 60oC. a. How much energy was needed to melt the ice? Show the steps of how you figured this out b. Use the information on page D-50 to explain how the ice melts. Include information about the energy transfers.

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?

The identities of substances are the same before and after which type of change