Types of Chemical Reactions - AP Chemistry

1. What is the characteristic feature of a catalyst in a reaction?

   Speeds up reaction without being consumed. Lowers activation energy without being consumed.

2. What type of reaction is $H_2O_2 \rightarrow H_2O + O_2$?

   Decomposition reaction. Hydrogen peroxide breaks down into water and oxygen.

3. State the general form of a double replacement reaction.

   $AB + CD \rightarrow AD + CB$. Ions from two compounds exchange partners.

4. What is a characteristic of an exothermic reaction?

   Releases energy to the surroundings. Heat is released during the reaction process.

5. What is a characteristic feature of a single replacement reaction?

   One element replaces another in a compound. A free element displaces another in a compound.

6. What is the product of the combustion of methane?

   Carbon dioxide and water. Methane combustion yields $CO_2$ and $H_2O$.

7. What defines an endothermic reaction?

   Absorbs energy from the surroundings. Heat is absorbed during the reaction process.

8. What type of reaction occurs in $Zn + 2HCl \rightarrow ZnCl_2 + H_2$?

   Single replacement reaction. Zinc displaces hydrogen from hydrochloric acid.

9. Identify the type of reaction: $C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O$.

   Combustion reaction. Propane reacts with oxygen producing $CO_2$ and $H_2O$.

10. Identify the reaction type of $CaCO_3 \rightarrow CaO + CO_2$.

    Decomposition reaction. One compound breaks into two products.

11. Identify the products of a hydrocarbon combustion reaction.

    Carbon dioxide and water. Hydrocarbons plus oxygen always yield $CO_2$ and $H_2O$.

12. What is the main feature of a displacement reaction?

    One element displaces another in a compound. Same definition as single replacement reaction.

13. Identify the type of reaction: $H_2 + Cl_2 \rightleftharpoons 2HCl$.

    Reversible reaction. Double arrow indicates equilibrium reaction.

14. Identify the type of reaction: $Ba(OH)_2 + H_2SO_4 \rightarrow BaSO_4 + 2H_2O$.

    Neutralization reaction. Base plus acid forms salt and water.

15. Identify the general form of a decomposition reaction.

    $AB \rightarrow A + B$. One compound breaks down into two or more products.

16. Which type of reaction is $AgNO_3 + NaCl \rightarrow AgCl + NaNO_3$?

    Double replacement reaction. Ions exchange partners between compounds.

17. What defines a redox reaction?

    Involves transfer of electrons between species. Oxidation and reduction occur simultaneously.

18. State the general form of a neutralization reaction.

    $Acid + Base \rightarrow Salt + Water$. Standard acid-base reaction equation.

19. What defines a reversible reaction?

    Can proceed in both forward and reverse directions. Equilibrium allows reaction in both directions.

20. What is the role of a reducing agent in a redox reaction?

    Donates electrons and becomes oxidized. Loses electrons while reducing another species.

21. Identify the type of reaction: $Mg + 2HCl \rightarrow MgCl_2 + H_2$.

    Single replacement reaction. Magnesium displaces hydrogen from acid.

22. Which type of reaction involves electron transfer?

    Redox reaction. Electrons are transferred between reactants.

23. Which reaction type involves a solid forming from two solutions?

    Precipitation reaction. Creates an insoluble solid from aqueous solutions.

24. What is the result of a precipitation reaction?

    Formation of an insoluble solid from solution. Mixing solutions creates an insoluble product.

25. Identify the reaction: $HCl + NaOH \rightarrow NaCl + H_2O$.

    Neutralization reaction. Acid plus base forms salt and water.

26. What occurs in a combustion reaction?

    A substance reacts with oxygen, releasing energy. Rapid reaction with $O_2$ that produces heat and light.

27. Identify the type of reaction: $Fe + S \rightarrow FeS$.

    Synthesis reaction. Two elements combine to form one compound.

28. Identify the reaction type: $2H_2O \rightarrow 2H_2 + O_2$.

    Decomposition reaction. Water molecule breaks into hydrogen and oxygen.

29. Which option best describes an oxidation reaction?

    Loss of electrons by a molecule, atom, or ion. Increase in oxidation state occurs.

30. Identify the type of reaction: $Cu + 2AgNO_3 \rightarrow Cu(NO_3)_2 + 2Ag$.

    Single replacement reaction. Copper displaces silver from silver nitrate.

31. What defines a double replacement reaction?

    Ions in two compounds exchange places. Cations and anions swap between two compounds.

32. Identify the type of reaction: $2Na + Cl_2 \rightarrow 2NaCl$.

    Synthesis reaction. Two elements combine to form one compound.

33. Determine the reaction type: $2KClO_3 \rightarrow 2KCl + 3O_2$.

    Decomposition reaction. Potassium chlorate breaks down when heated.

34. Which type of reaction is $2H_2 + O_2 \rightarrow 2H_2O$?

    Synthesis reaction. Two elements combine to form one compound.

35. What defines a synthesis reaction in terms of reactants and products?

    Multiple reactants form a single product. Many starting materials yield one final product.

36. What defines a synthesis reaction?

    Two or more substances combine to form one compound. Multiple reactants combine into a single product.

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