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Chemical Reactions and Balancing Equations

Quiz by David Capuchina

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16 questions
Show answers
  • Q1
    Which of the following is the balanced equation for the reaction between nitrogen gas (N2) and hydrogen gas (H2) to form ammonia (NH3)?
    3N2 + H2 -> NH3
    N2 + 2H2 -> NH3
    2N2 + 3H2 -> NH3
    N2 + 3H2 -> 2NH3
    30s
  • Q2
    Which of the following is the balanced equation for the reaction between sodium carbonate (Na2CO3) and hydrochloric acid (HCl) to form sodium chloride (NaCl), carbon dioxide (CO2), and water (H2O)?
    2Na2CO3 + 2HCl -> 2NaCl + CO2 + H2O
    Na2CO3 + 2HCl -> NaCl + CO2 + 2H2O
    Na2CO3 + 2HCl -> NaCl + CO2 + H2O
    2Na2CO3 + HCl -> 2NaCl + CO2 + H2O
    30s
  • Q3
    Which of the following is the balanced equation for the reaction between sulfuric acid (H2SO4) and calcium hydroxide (Ca(OH)2) to form calcium sulfate (CaSO4) and water (H2O)?
    H2SO4 + 2Ca(OH)2 -> CaSO4 + 2H2O
    H2SO4 + Ca(OH)2 -> 2CaSO4 + 2H2O
    H2SO4 + Ca(OH)2 -> CaSO4 + 2H2O
    2H2SO4 + Ca(OH)2 -> CaSO4 + H2O
    30s
  • Q4
    What happens during a chemical reaction?
    Substances change their state
    Substances disappear
    Substances remain the same
    Two or more substances mix to form new substances with different properties
    30s
  • Q5
    What are reactants in a chemical reaction?
    The resulting substances at the end of a reaction
    The substances that disappear during a reaction
    The substances that change their state
    The initial substances that participate in a chemical reaction
    30s
  • Q6
    What are products in a chemical reaction?
    The initial substances before a reaction
    The substances that disappear during a reaction
    The substances that change their state
    The resulting substances at the end of a reaction or as an intermediate step
    30s
  • Q7
    What happens to matter during a chemical reaction?
    It changes its state
    It cannot be created or destroyed, but can be rearranged due to changes in bonds
    It is destroyed
    It is created
    30s
  • Q8
    What does a balanced chemical equation demonstrate?
    The change in temperature
    The formation of new substances
    Conservation of mass, ensuring the same number of atoms of each element on both sides of the equation
    The change in physical properties
    30s
  • Q9
    What is the purpose of a coefficient in a chemical equation?
    To indicate the physical state of a substance
    To indicate the concentration of a solution
    To determine the molar mass of a substance
    To balance the number of atoms on each side of the equation, ensuring equality
    30s
  • Q10
    What is the minimum energy required to initiate a reaction called?
    Activation energy
    Endothermic energy
    Kinetic energy
    Exothermic energy
    30s
  • Q11
    What type of reactions release energy in the form of heat?
    Exothermic reactions
    Endothermic reactions
    Oxidation reactions
    Combustion reactions
    30s
  • Q12
    What type of reactions absorb energy?
    Exothermic reactions
    Combustion reactions
    Endothermic reactions
    Oxidation reactions
    30s
  • Q13
    What is the purpose of subscripts in a chemical formula?
    To balance chemical equations
    To determine the molar mass of a substance
    To indicate the physical state of a substance
    To indicate the number of atoms of each element in a molecule
    30s
  • Q14
    What does it mean to say that a chemical reaction is exothermic?
    It releases heat or energy to its surroundings.
    It absorbs heat or energy from its surroundings.
    It proceeds at a very slow rate.
    It does not involve any change in temperature.
    30s
  • Q15
    What is the main purpose of balancing chemical equations?
    To indicate the overall energy change of the reaction.
    To increase the reaction rate.
    To satisfy the law of conservation of mass.
    To make the equation look symmetrical.
    30s

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