Lesson Worksheet: Reaction Equations Chemistry • 7th Grade

In this worksheet, we will practice constructing equations for chemical reactions and writing them using words or chemical symbols.


What is the meaning of the arrow () in a chemical reaction equation?

  • ABecomes
  • BIs like
  • CCannot become
  • DIs the same as
  • EIs made of


In which part of a chemical reaction equation are the reactants of the reaction written?

  • ABelow the arrow
  • BAbove the arrow
  • CTo the left of the arrow
  • DTo the right of the arrow


In which part of a chemical reaction equation are the products of the reaction written?

  • AAbove the arrow
  • BTo the right of the arrow
  • CBelow the arrow
  • DTo the left of the arrow


Hydrogen gas can be produced by reacting zinc with sulfuric acid. This reaction also produces zinc sulfate. Which of the following symbol equations shows this chemical reaction?

  • AZnSO+HZn+HSO4224
  • BZn+HSOZnSO+H2442
  • CZnHSOH+ZnSO2424
  • DH+HSOZn+ZnSO2244
  • EZn+HZnSO+HSO2424


An experiment shows that hydrogen peroxide decomposes to form water and oxygen gas. Which of the following word equations describes the chemical reaction that has occurred in this experiment?

  • AHydrogenperoxidehydrogenoxygenperoxide+
  • BHydrogenperoxidewateroxygen+
  • CHydrogenperoxidewateroxygen+
  • DHydrogenperoxideperoxidehydrogen+
  • EHydrogenperoxideoxygenwater+


Pick the statement that describes the chemical reaction shown in the following symbolic equation: CH+2OCO+2HO4222

  • AMethane burns in carbon dioxide to produce oxygen and water.
  • BMethane decomposes under heat to produce oxygen, carbon dioxide, and water.
  • CCarbon dioxide reacts with water to produce methane and oxygen.
  • DOxygen reacts with water to produce methane and carbon dioxide.
  • EMethane burns in oxygen to produce carbon dioxide and water.


The formation of ammonia from nitrogen and hydrogen is a reversible reaction. What is the full symbol equation (including state symbols) for this chemical reaction?

  • ANH()NH()ss3
  • BN()+H()NH()ggg3
  • CN()+H()NH()223aqaqs
  • DN()+H()NH()223ggs
  • EN()+H()NH()223ggg


When aqueous silver nitrate is mixed with aqueous sodium chloride, a white solid precipitate of silver chloride is produced. The symbol equation for this reaction is shown below: AgNO()+NaCl()AgCl()+NaNO()33 What state symbols should be added to each compound to complete the equation?

  • Aaq, s, l, aq
  • Bl, l, s, aq
  • Cs, aq, aq, aq
  • Ds, s, g, aq
  • Eaq, aq, s, aq


In the process of photosynthesis, carbon dioxide and water react together, in the presence of sunlight, to produce glucose and oxygen. Which of the following word equations describes this chemical reaction?

  • ACarbon dioxide + water glucose + oxygen
  • BOxygen + carbon dioxide water + glucose
  • COxygen + water + carbon dioxide glucose
  • DWater + glucose oxygen + carbon dioxide
  • EOxygen + glucose water + carbon dioxide


The symbol equation for the decomposition of iron(II) sulfate is given below: FeSOFeO+SO+SO42323

What is the reactant in this chemical reaction?

  • AFeSO4
  • BSO3
  • CFe
  • DSO2
  • EFeO23

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