These are ionic compounds which can result from the neutralization reaction of an acid and a base. they are ionic compounds composed of cations (positively charged ions) and anions (negative ions), so that the product is electrically neutral (without a net charge).

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

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conservation of mass

mass before something happens = mass afterwards