1,001 Chemistry Practice Problems For Dummies (2014)
Part I. The Questions
Chapter 9. Chemical Reactions
Every chemical reaction begins with the formula of one or more substances (reactants) followed by an arrow and ends with the formula of one or more substances (products). There are many types of chemical reactions; however, only a few basic types appear in this chapter. Redox reactions tend to be more difficult to balance than the other reactions here, so you use a systematic approach to balance most redox reactions.
The Problems You’ll Work On
In this chapter, you work with chemical reactions in the following ways:
Identifying types of reactions
Balancing chemical equations
Balancing redox reactions
Note: See the Appendix if you need to check the periodic table.
What to Watch Out For
Remember the following when working on chemical reactions:
When balancing equations, never change a chemical formula; change only the coefficients.
There are only a few basic reaction types here, so don’t invent new ones. But note that a reaction may fit into more than one category.
Ionic equations contain ions.
Acid-base reactions always produce a salt and usually produce water.
Redox reactions must have an oxidation and a reduction.
Classifying Reactions from Chemical Equations
546–555 Given the chemical equation, name the type of reaction (combination, combustion, decomposition, single displacement, or double displacement).
546. What type of reaction is the following reaction?
547. What type of reaction is the following reaction?
548. What type of reaction is the following reaction?
549. What type of reaction is the following reaction?
550. What type of reaction is the following reaction?
551. What type of reaction is the following reaction?
552. What type of reaction is the following reaction?
553. What type of reaction is the following reaction?
554. What type of reaction is the following reaction?
555. What type of reaction is the following reaction?
Classifying Reactions from Word Equations
556–565 Given the word equation, name the type of chemical reaction (combination, combustion, decomposition, single displacement, or double displacement).
556. What type of reaction is the following reaction?
557. What type of reaction is the following reaction?
558. What type of reaction is the following reaction?
559. What type of reaction is the following reaction?
560. What type of reaction is the following reaction?
561. What type of reaction is the following reaction?
562. What type of reaction is the following reaction?
563. What type of reaction is the following reaction?
564. What type of reaction is the following reaction?
565. What type of reaction is the following reaction?
Predicting Reactions
566–575 Given the reactants, predict the type of chemical reaction.
566. Predict the type of reaction these reactants would undergo:
567. Predict the type of reaction this reactant would undergo when heated:
568. Predict the type of reaction these reactants would undergo:
569. Predict the type of reaction these reactants would undergo:
570. Predict the type of reaction these reactants would undergo:
571. Predict the type of reaction these reactants would undergo:
572. Predict the type of reaction these reactants would undergo:
573. Predict the type of reaction these reactants would undergo:
574. Predict the type of reaction this reactant would undergo when heated:
575. Predict the type of reaction these reactants would undergo:
Balancing Chemical Reactions
576–585 Balance the chemical reaction.
576. What are the coefficients of the following equation when it’s balanced?
577. What are the coefficients of the following equation when it’s balanced?
578. What are the coefficients of the following equation when it’s balanced?
579. What are the coefficients of the following equation when it’s balanced?
580. What are the coefficients of the following equation when it’s balanced?
581. What are the coefficients of the following equation when it’s balanced?
582. What are the coefficients of the following equation when it’s balanced?
583. What are the coefficients of the following equation when it’s balanced?
584. What are the coefficients of the following equation when it’s balanced?
585. What are the coefficients of the following equation when it’s balanced?
Balancing Reactions from Word Equations
586–595 Given the word equation, balance the chemical reaction.
586. What are the coefficients of the following reaction when it’s balanced?
587. What are the coefficients of the following reaction when it’s balanced?
588. What are the coefficients of the following reaction when it’s balanced?
589. What are the coefficients of the following reaction when it’s balanced?
590. What are the coefficients of the following reaction when it’s balanced?
591. What is the sum of the coefficients of the following reaction when it’s balanced?
592. What is the sum of the coefficients of the following reaction when it’s balanced?
593. What is the sum of the coefficients of the following reaction when it’s balanced?
594. What is the sum of the coefficients of the following reaction when it’s balanced?
595. What are the coefficients of the following reaction when it’s balanced?
Predicting Products and Balancing Reactions
596–605 Given the reactants, predict the products and balance the chemical reaction.
596. When the following reaction is completed and balanced, what is the coefficient on the barium hydroxide?
597. When the following reaction is completed and balanced, what is the coefficient on the nickel(II) chloride?
598. The compound in the following reaction is heated. What is the sum of the coefficients when the reaction is completed and balanced? (Hint: One of the products of heating this compound is another form of lead oxide.)
599. When the following reaction is completed and balanced, what is the coefficient on the silver nitrate?
600. When the following reaction is completed and balanced, what is the sum of the coefficients? (Hint: The products are two elements.)
601. Complete and balance the following reaction:
602. When the following reaction is completed and balanced, what is the sum of the coefficients? (Hint: One of the products is water.)
603. When the following reaction is completed and balanced, what is the coefficient on the nitrogen dioxide? (Hint: The products are two elements.)
604. Complete and balance the following reaction:
605. When the following reaction is completed and balanced, what is the coefficient on the copper(II) sulfate?
Redox and Acid-Base Reactions
606–621 Answer the following questions on redox and acid-base (neutralization) reactions.
606. What is the oxidation number of Mn in KMnO4?
607. What is the oxidation number of Br in NaBrO3?
608. What is the oxidation number of Cr in Cr2O72–?
609. What is the oxidation number of S in S2O32–?
610. When a substance loses electrons during the course of a reaction, it goes through which process?
611. When a substance gains electrons during the course of a reaction, it goes through which process?
612. Which substance in the following forward reaction is oxidized?
613. Which substance in the following forward reaction is reduced?
614. Which substance in the following forward reaction is the reducing agent?
615. Which substance in the following forward reaction is the oxidizing agent?
616. How many electrons are necessary to balance the following half-reaction that takes place in an acidic environment?
617. How many electrons are necessary to balance the following half-reaction that takes place in a basic environment?
618. How many hydrogen ions do you need to balance the following oxidation-reduction reaction?
619. What is the coefficient of the OH– when the following oxidation-reduction reaction is balanced?
620. What are the coefficients of the following reaction when it’s balanced?
621. What is the coefficient of 
when the following reaction is balanced?
