One twelfth of the mass of a carbon-12 atom is used to define a

What happens to substances during a chemical change

Consider the gas-phase reaction: N2 (g) + 3H2 (g) ⇆ 2NH3 (g) , for which Kp = 43 at 400 K. If the mixture is analyzed and found to contain 0.18 bar of N2, 0.36 bar of H2 and 0.

How would you prepare 500 ml of a 0.2% solution of the detergent Tween-20? This reagent is a liquid in its pure state.

Which element reacts spontaneously with 1.0M HCl (aq) at room temperature? (1) copper (3) silver (2) gold (4) zinc

The chemical formula for emerald is Be3Al2 (SiO3) 6. An emerald can be described as a pure substance because it is a compound. a pure substance because it is an element. an impure substance because it is chemically combined.

An element's most stable ion forms an ionic compound with bromine, having the formula XBr. If the ion of element X has a mass number of 85 and has 36 electrons, what is the identity of the element?

How many molecules are in 3 moles of Fe2O3?

What terms are needed to completely describe velocity ... A. units B. number C. mass D. direction

How many grams are in 3.3 moles of potassium sulfide, k2s

What is fusion energy