Chemical Equations
Chemistry ⇒ Chemical Reactions and Equations
Chemical Equations starts at 7 and continues till grade 12.
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See sample questions for grade 7
Balance the following equation: ___Al + ___O2 → ___Al2O3
Balance the following equation: ___C2H6 + ___O2 → ___CO2 + ___H2O
Balance the following equation: ___Fe + ___O2 → ___Fe2O3
Balance the following equation: ___H2 + ___N2 → ___NH3
In the equation: 2KClO3 → 2KCl + 3O2, how many oxygen molecules are produced?
A reaction is represented by the equation: 2AgNO3 + Cu → Cu(NO3)2 + 2Ag. How many silver atoms are produced when 1 mole of copper reacts completely?
A student writes the following unbalanced equation for the reaction of calcium with water: Ca + H2O → Ca(OH)2 + H2. Balance the equation.
A chemical equation is written as: 2H2 + O2 → 2H2O. If you start with 4 molecules of hydrogen and 2 molecules of oxygen, how many molecules of water will be produced?
Which of the following best describes a balanced chemical equation? (1) The number of molecules is the same on both sides (2) The number of atoms of each element is the same on both sides (3) The number of products is equal to the number of reactants (4) The total mass is doubled on the product side
Which of the following is a balanced chemical equation? (1) H2 + O2 → H2O (2) 2H2 + O2 → 2H2O (3) H2 + 2O2 → 2H2O (4) 2H2 + 2O2 → 2H2O
Which of the following is a decomposition reaction? (1) 2H2O → 2H2 + O2 (2) H2 + Cl2 → 2HCl (3) NaOH + HCl → NaCl + H2O (4) Fe + S → FeS
Which of the following is a double displacement reaction? (1) NaOH + HCl → NaCl + H2O (2) 2KClO3 → 2KCl + 3O2 (3) AgNO3 + NaCl → AgCl + NaNO3 (4) 2H2 + O2 → 2H2O
Fill in the blank: In a chemical equation, the substances formed as a result of the reaction are called ______.
Fill in the blank: In the equation 2H2 + O2 → 2H2O, the number of oxygen atoms on the left is ______.
Fill in the blank: In the equation 2K + 2H2O → 2KOH + ______, the missing product is ______.
Fill in the blank: The chemical equation for the reaction of hydrogen and chlorine to form hydrogen chloride is H2 + Cl2 → ______.
True or False: In a chemical equation, the arrow always points from products to reactants.
True or False: In a chemical equation, the substances on the left side of the arrow are called products.
True or False: The chemical formula for water is H2O.
True or False: The coefficients in a chemical equation indicate the number of molecules or moles of a substance.
