Inside the room the air is often warmer near the ceiling than near the floor. Which of the following accounts for the difference in temperature?

A. radiation

B. insulation

C. convection

D. conduction

Which answer choice best explains why nuclear reactions release more energy than chemical reactions?

Which statement is true about a proton and an electron? (1) They have the same masses and the same charges. (2) They have the same masses and different charges. (3) They have different masses and the same charges.

A white powdery substance has the mass of 760.33 g. The products of the reaction are tin and oxygen. The tin has a mass of 300. g. Based on the Law of Mass Conservation, find the mass of the oxygen produced?

Aluminum hydroxide + nitric acid ➡ aluminum nitrate + water

A 110 g copper bowl contains 240 g of water, both at 21.0°C. A very hot 410 g copper cylinder is dropped into the water, causing the water to boil, with 8.60 g being converted to steam. The final temperature of the system is 100°C.

A system consists of two components, each of which must activate if the system is to activate. One component has a reliability of. 99. The other has a reliability of. 95. The components are independent of one another with respect to reliability.

Which of the following energy level changes for an electron is most energetic? 3 → 2 5 → 2 4 → 2

Is baking soda a element compound homogeneous mixture or heterogeneous mixture?

For the reaction: C (CH3) 3I + Cl - → C (CH3) 3Cl + I- What is the activation barrier for the SN2 reaction mechanism, in units of kcal/mol? Provide your answer to the nearest 0.1 kcal/mol.

Which of the following utilizes the measurement of a short - or long-lived radioactive element, with its decay product, to determine the absolute age of an object? A. varves B. radiometric dating C. dendrochronology