Liquid water and water vapor reach equilibrium only in a closed container. Why?

4.35 L of N2, at 25 ∘C and 1.16 atm, is mixed with 2.20 L of O2, at 25 ∘C and 0.277 atm, and the mixture allowed to react. N2 (g) + O2 (g) →2NO (g) How much NO, in grams, is produced?

Which of the following is true about endothermic reactions? The change in enthalpy is positive and the reactants contain more energy than the products. The change in enthalpy is negative and the reactants contain more energy than the products.

For main-group elements, are outer electron configurations similar or different within a group? Within a period? Explain.

Which is more polar, a sulfur-bromine (s-br) bond or a selenium-chlorine (se-cl) bond?

Give the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of MgSO3 and HI are mixed.

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