During the process of heat transfer, the heat transferred to or from a system's surroundings is always: Select the correct answer below:
A. greater than the heat transferred to or from the system
B. less than the heat transferred to or from the system
C. equal in both magnitude and sign to the heat transferred to or from the system
D. equal in magnitude to the heat transferred to or from the system, but opposite in sign

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

Asolution contains 225 g of sodium chloride, nacl, dissolved in enough water to make a 0.25 l of solution. what is the molarity of the solution? a. 3.88 m, b. 1.03 m, c. 1.5 m, d. 15.5 m

This active feature of earth's crust in building mountain ranges as well as islands. this feature is a a) cavern. b) earthquake. c) mountain. d) volcano.