Lesson Worksheet: Oxidization and Reduction Science

In this worksheet, we will practice identifying, and analyzing oxidization and reduction reactions.


What is the chemical process that involves an atom gaining one or more electrons known as?

  • ASubstitution
  • BCombustion
  • COxidization
  • DReduction
  • ENeutralization


Consider the reaction between sodium and chlorine:Cl()+2Na()2NaCl()2gss

Which chemical species is oxidized in the reaction?

  • AThe sodium atoms
  • BThe sodium ions
  • CThe chlorine atoms
  • DThe chlorine ions


What is the name of the chemical process in which the percentage of oxygen in a substance increases?

  • AReduction
  • BNeutralization
  • CCombustion
  • DSubstitution
  • EOxidization


Fill in the blank: If, during the course of a chemical reaction, there is an increase in the percentage of hydrogen in a substance, then that substance is said to have been .

  • Aoxidized
  • Breduced
  • Cprecipitated
  • Dextracted
  • Eneutralized


Which of the following descriptions can be used for an oxidizing agent?

  • A1, 2, and 5
  • B1, 3, and 4
  • C2 and 5
  • D2, 3, and 4
  • E1 and 5


Which of the following statements about oxidization and reduction is correct?

  • AOxidization can happen independently of reduction.
  • BReduction happens before oxidization.
  • COxidization happens before reduction.
  • DOxidization and reduction happen concurrently.


Which of the following diagrams shows a chloride ion formed when an atom of chlorine is reduced?

  • A
  • B
  • C
  • D
  • E


Consider the reaction of sodium with chlorine: 2Na()+Cl()2NaCl()sgs2

Which of the following particle diagrams correctly shows what happens to the sodium atoms in this reaction?

  • A
  • B
  • C
  • D
  • E


Consider the following equation: Mg()+CuSO()MgSO()+Cu()saqaqs44

Simple substitution reactions, where a more active metal replaces another, involve oxidization and reduction. In the equation, magnesium displaces copper. Which of the following statements correctly explains the oxidization and reduction occurring in this reaction?

  • AThe copper ions lose electrons.
  • BMagnesium is acting as an oxidizing agent.
  • CThe copper ions turning into copper atoms is oxidation.
  • DThe magnesium atoms turning into magnesium ions is oxidation.
  • EThe magnesium atoms turning into magnesium ions is reduction.


A teacher demonstrates the reduction of copper(II) oxide to students in a class using 2.0 g of CuO.

After the experiment is finished, the teacher reweighs the chemicals in the reduction tube.

What is the mass of the solid chemicals?

  • AThe same, 2.0 g
  • BLess than 2.0 g
  • CMore than 2.0 g

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