Cho phản ứng bậc một: A → B có hằng số tốc độ là 8.10 3.min 1. Tính thời gian để nồng độ chất A còn lại 0,25 so với lượng ban đầu

Write a brief passage describing a neutral atom of nitrogen-14 (n-14). describe the number of protons, neutrons, and electrons in the atom, where each type of particle is located, and how the terms atomic number, mass number, and atomic mass are related to the particles. use the periodic table to you. 14 protons and eletrons since its a neutral atom

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present