Which of the following is an example of a decomposition reaction? 1) H2 + O2 → H2O 2) MgO2 → Mg + O2 3) MgSO4 + 2NaCl → MgCl2 + Na2SO4 4) 2Na + Cl2 → 2NaCl

2) MgO ---→ Mg + O2

Explanation:

Chemical decomposition is defined as the breakdown or breaking of a single molecule or entity into two or more smaller fragments.

Chemical decomposition is usually regarded as the exact opposite of chemical synthesis. In most cases, the chemical reaction in which two or more products are formed from a single reactant is called a decomposition reaction.

the correct name for the n3 ion is azide. azide is a polyatomic anion with a -1 charge and is written as n3 -1. it consists of three nitrogen atoms bonded together. hope i . let me know if you need anything else.

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation: