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 12
A reaction is represented as: 2H2 + O2 → 2H2O. If 4 moles of hydrogen react, how many moles of water are produced?
Balance the following chemical equation: __Fe + __O2 → __Fe2O3
Balance the following equation: __Al + __HCl → __AlCl3 + __H2
Balance the following equation: __C2H6 + __O2 → __CO2 + __H2O
Balance the following equation: __C3H8 + __O2 → __CO2 + __H2O
A reaction is represented as: 2H2 + O2 → 2H2O. If 4 moles of hydrogen react, how many moles of water are produced?
A student writes the following equation: CaCO3 → CaO + CO2. Is this equation balanced?
Consider the following scenario: A student is asked to write the net ionic equation for the reaction between aqueous solutions of Na2CO3 and CaCl2. Write the balanced net ionic equation for this reaction.
A chemical equation is said to be balanced when: (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 total mass is the same on both sides. (4) Both (2) and (3) are correct.
A chemical equation must be balanced to obey which law? (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 best describes a balanced chemical equation? (1) The number of atoms of each element is the same on both sides of the equation. (2) The total mass of reactants is less than the total mass of products. (3) The equation contains only ionic compounds. (4) The equation is written in words.
Which of the following is a correct ionic equation for the reaction between AgNO3 (aq) and NaCl (aq)? (1) Ag+ (aq) + Cl- (aq) → AgCl (s) (2) AgNO3 (aq) + NaCl (aq) → AgCl (s) + NaNO3 (aq) (3) Ag (s) + Cl2 (g) → AgCl (s) (4) Ag+ (aq) + NO3- (aq) + Na+ (aq) + Cl- (aq) → AgCl (s) + Na+ (aq) + NO3- (aq)
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 chemical equation 2H2 + O2 → 2H2O, the coefficient of O2 is _______.
Fill in the blank: In the equation 2Na + 2H2O → 2NaOH + H2, the number of hydrogen atoms on the reactant side is _______.
Fill in the blank: The arrow in a chemical equation is read as _______.
A student writes the following equation: CaCO3 → CaO + CO2. Is this equation balanced?
True or False: A catalyst is always written above the arrow in a chemical equation.
True or False: The coefficients in a balanced chemical equation represent the relative number of moles of each substance involved in the reaction.
True or False: The coefficients in a chemical equation can be fractions.
