he first law of thermodynamics states that the change U in the internal energy of a system is given by U = Q+W, where Q is the heat, and W is the work. Both Q and W can be positive or negative numbers. Q is a positive number and W is a positive number if .

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

Which of the following harmful chemicals are found in tobacco smoke? a. carbon monoxide b. carbon dioxide c. nicotine b. carbon dioxide d. both a and c

Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.