How much heat is necessary to change 10.0g of water from 20 degrees celsius to 75 degrees celsius

Which statement about the stamps is correct?

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.