How many neutrons does a beryllium atom with four protons and a mass number of nine?

Soil is best described as a pure substance or a mixture or a compound

Bromine monochloride is synthesized using the reaction: Br2 (g) + Cl2 (g) 2 BrCl (g) Kp = 1.1 x 10^ - 4 at 150 K 1. A 199.0 L flask initially contains 0.979 kg of Br 2 and 1.075 kg of Cl 2.

Explain how the biosphere, geosphere and atmosphere are interconnected

Why does phosphate act as an environmental contaminant?

What is base in chemistry

Gypsum is hydrated calcium sulfate. a 4.89 g sample of this hydrate was heated. after the water was removed, 3.87 g anhydrous calcium sulfate remained. determine the formula of this hydrate and name the compound.

A chemical reaction produces CO2 (g). If 44 g is produced at 1.0 atm and 25°C, what volume will the gas occupy? (Assume that CO2 behaves as an ideal gas under these conditions.

What is the smallest carbohydrate called?

One of the characteristics of living things is that they respond to external changes in their environment so that their internal environment stays as stable as possible. why must an organism do this

A 21.0 kg child is running at a velocity of 2.50 m/s. The child is carrying a 2.25 kg gallon of milk. What is the momentum of the child and the milk together?