Science, Tech, Math › Science Chemical Reaction Classification Quiz - Types of Chemical Reactions See How Well You Can Identify Types of Chemical Reactions Take this quiz to see if you can classify chemical reactions correctly. Geir Pettersen / Getty Images Science Chemistry Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. Learn about our Editorial Process Updated on March 06, 2017 1. The chemical reaction: 2 H₂O → 2 H₂ + O₂ is a: synthesis reaction decomposition reaction single displacement reaction double displacement reaction combustion reaction Correct Wrong You can recognize a decomposition or analysis reaction by noticing a compound or molecule breaks into smaller chemical species. 2. The chemical reaction: 8 Fe + S₈ → 8 FeS is a: synthesis reaction decomposition reaction single displacement reaction double displacement reaction combustion reaction Correct Wrong A synthesis reaction or direct combination is the reverse of a decomposition reaction. In a synthesis reaction, two or more reactants combine to form a more complex molecule. 3. The chemical reaction: AgNO₃ + NaCl → AgCl + NaNO₃ is a: synthesis reaction decomposition reaction single displacement reaction double displacement reaction combustion reaction Correct Wrong A double displacement reaction is sometimes called a metathesis reaction. In this type of chemical reaction, two reactants exchange ions to form two different compounds. 4. The chemical reaction: Zn + H₂SO₄ → ZnSO₄ + H₂ is a: synthesis reaction decomposition reaction single displacement reaction double displacement reaction combustion reaction Correct Wrong A single displacement reaction is also called a substitution reaction. It's a common type of reaction in which one element is displaced by another. It takes the form: A + BC → AC + B 5. The chemical reaction: 2 H₂ + O₂ → 2 H₂O is a: synthesis reaction decomposition reaction single displacement reaction double displacement reaction combustion reaction Correct Wrong The formation of water from its elements is a type of synthesis reaction. Some people also consider it a combustion reaction because oxygen is used and energy is released. However, no carbon dioxide is released. 6. The chemical reaction: CH₄ + 2 O₂ → CO₂ + 2 H₂O is a: synthesis reaction decomposition reaction single displacement reaction double displacement reaction combustion reaction Correct Wrong This reaction meets all of the criteria for classification as a combustion reaction. Here, a fuel and an oxidizer react to produce water and carbon dioxide. Heat is also released by this reaction. 7. The chemical reaction: 2 Fe + 6 NaBr → 2 FeBr₃ + 6 Na is a: synthesis reaction decomposition reaction single displacement reaction double displacement reaction combustion reaction Correct Wrong This is another example of a single displacement reaction, since iron and sodium displace each other in the reaction. 8. The chemical reaction: Pb + O₂ → PbO₂ is a: synthesis reaction decomposition reaction single displacement reaction double displacement reaction combustion reaction Correct Wrong This is a basic example of a synthesis reaction. 9. The chemical reaction: 2 CO + O₂ → 2 CO₂ is a: synthesis reaction decomposition reaction single displacement reaction double displacement reaction combustion reaction Correct Wrong This is a synthesis reaction. As with the formation of water, some texts would also consider it a combustion reaction. It's okay for a chemical reaction to be more than one thing! 10. The chemical reaction: Ca(OH)₂ + H₂SO₄ → CaSO₄ + 2 H₂O is a: synthesis reaction decomposition reaction single displacement reaction double displacement reaction combustion reaction Correct Wrong This is a double displacement reaction. The hydroxide and sulfate anions switch cations. Chemical Reaction Classification Quiz - Types of Chemical Reactions You got: % Correct. Could Use More Chemical Reaction Classification Practice Martin Leigh / Getty Images Good job! You completed the quiz, so you've seen examples of the different types of chemical reactions. If you're still a bit shaky on how to tell the types of reactions apart or if you just want more examples, you can review the main reaction types. If you're ready to try another quiz, see how familiar you are with the units of measurement. Share Your Results Chemical Reaction Classification Quiz - Types of Chemical Reactions You got: % Correct. Competent Chemical Reaction Classifier Serge Kozak / Getty Images Great work! You really know a lot about the main types of chemical reactions and how to identify them. From here, you might want to review 10 examples of chemical reactions you could encounter in everyday life. Are you ready for another quiz? See whether you can identify lab safety signs and hazard symbols. Share Your Results