What mass, in grams, of ammonium chloride must be added to a 0.400 L solution of 0.200 M ammonia to make a buffer with a pH of 9.20? Kb (NH₃) = 1.8 × 10⁻⁵

All cells are made of four types of acids, lipids, proteins, and carbohydrates.

What material does not melt at any temperature

1. explain hydrogen peroxide, h 2 o 2 properties and decomposition reaction. 2. describe how each of the following natural cycles plays a part in earth’s climate system. (a) the water cycle (b) the carbon cycle