Combination Reactions Lab Report

Balance the following chemical equations and separate the coefficients by commas and a space respectively (put a 1 if the coefficient is assumed 1):
5.3 Types of Chemical Reactions
5.3.1 Combination reactions
Combination reactions are when two separate species react together to produce a new more complex compound. In other words, two species combine to form a new compound. These reactions take the form of:

X+Y →XY

Combination Reaction
Synthesis reaction - sodium chloride formation of sodium metal and chlorine gas. Types of chemical reactions, part 1 of 7. Educational chemistry for kids. Cartoon vector illustration in flat style.

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2Na(s)+Cl2(g)→2NaCl(s)

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One common combination reaction you have likely seen is elemental iron (Fe) reacting with oxygen gas (O2) to form rust (Fe2O3). Although rust makes it appear that something is decomposing, rust is actually a chemical combination.

We can write (and now balance) this reaction as

4Fe(s)+3O2(g)→2Fe2O3(s)

Other examples of combination reactions are:

4k(s)+O2(g)→2K2O(s)
H2(g)+O2(g)→H2O2(l)
SO3(g)+ H2O(l)→H2SO4(aq)

5.3.2 Decomposition reactions
Decomposition creations occur when compounds decompose into two different species. This, of course, is the opposite of a combination reaction. These reactions take the form of:

XY →X+Y
Decomposition reaction - copper carbonate to copper oxide and carbon dioxide. Types of chemical reactions, part 4 of 7. Educational chemistry for kids. Cartoon vector illustration in flat style.

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CuCO3(s)→heatCuO(g)+CO2(g)

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