Balancing Chemical Equations
Chemistry ⇒ Chemical Reactions and Equations
Balancing Chemical Equations starts at 9 and continues till grade 12.
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See sample questions for grade 10
A student writes the equation: 2Mg + O2 → 2MgO. How many oxygen atoms are present on each side of the equation?
Balance the following equation: AgNO3 + Cu → Cu(NO3)2 + Ag
Balance the following equation: Al + HCl → AlCl3 + H2
Balance the following equation: C2H6 + O2 → CO2 + H2O
Balance the following equation: C3H8 + O2 → CO2 + H2O
Balance the following equation: Ca(OH)2 + H3PO4 → Ca3(PO4)2 + H2O
A student writes the equation: 2Mg + O2 → 2MgO. How many oxygen atoms are present on each side of the equation?
A student writes the equation: N2 + 3H2 → 2NH3. Is this equation balanced?
If a chemical equation is not balanced, which of the following is true?
(1) The number of atoms of each element is equal on both sides
(2) The law of conservation of mass is violated
(3) The equation is correct as written
(4) The products are always gases
Which law is demonstrated by balancing chemical equations?
(1) Law of Definite Proportions
(2) Law of Conservation of Mass
(3) Law of Multiple Proportions
(4) Law of Constant Composition
Which of the following equations is balanced?
(1) CH4 + 2O2 → CO2 + 2H2O
(2) CH4 + O2 → CO2 + H2O
(3) 2CH4 + 2O2 → 2CO2 + 4H2O
(4) CH4 + 4O2 → CO2 + 2H2O
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
Fill in the blank to balance the equation: __Na + Cl2 → 2NaCl
Fill in the blank: In the equation 2H2 + O2 → 2H2O, the total number of oxygen atoms on the reactant side is __.
Fill in the blank: The number of atoms of each element must be the ______ on both sides of a balanced chemical equation.
Fill in the blank: To balance the equation H2 + __O2 → H2O, the coefficient in front of O2 should be __.
A student writes the equation: N2 + 3H2 → 2NH3. Is this equation balanced?
True or False: Coefficients in a balanced equation represent the relative number of molecules or moles of each substance.
True or False: In a balanced chemical equation, the total mass of reactants equals the total mass of products.
True or False: The coefficients in a balanced equation can be fractions.
