Multiple Choice
Indicate the type of chemical reaction taking place from the following equation:
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7. Chemical Reactions
Types of Chemical Reactions
1:59 minutesProblem 69
Textbook Question
Magnetite, an iron ore with formula Fe3O4, can be reduced by treatment with hydrogen to yield iron metal and water vapor.Write the balanced equation.
Verified step by step guidance1
Identify the reactants and products in the chemical reaction. The reactants are magnetite (Fe3O4) and hydrogen (H2), and the products are iron (Fe) and water vapor (H2O).
Write the unbalanced chemical equation: Fe3O4 + H2 -> Fe + H2O.
Balance the iron (Fe) atoms first. There are 3 Fe atoms in Fe3O4, so you need 3 Fe atoms on the product side: Fe3O4 + H2 -> 3Fe + H2O.
Next, balance the oxygen (O) atoms. There are 4 O atoms in Fe3O4, so you need 4 H2O molecules on the product side: Fe3O4 + H2 -> 3Fe + 4H2O.
Finally, balance the hydrogen (H) atoms. There are 8 H atoms needed for 4 H2O molecules, so you need 4 H2 molecules on the reactant side: Fe3O4 + 4H2 -> 3Fe + 4H2O.
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1mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Balancing Chemical Equations
Balancing chemical equations involves ensuring that the number of atoms of each element is the same on both sides of the equation. This is based on the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. To balance an equation, coefficients are adjusted in front of the chemical formulas to achieve equal atom counts.
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Reduction Reactions
Reduction reactions involve the gain of electrons or a decrease in oxidation state by a substance. In the context of magnetite (Fe3O4) being reduced by hydrogen, iron ions in the ore gain electrons from hydrogen, which is oxidized to water. Understanding reduction is crucial for identifying how reactants transform into products in redox reactions.
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Stoichiometry
Stoichiometry is the calculation of reactants and products in chemical reactions based on their molar ratios. It allows chemists to predict the amounts of substances consumed and produced in a reaction. In the case of reducing magnetite with hydrogen, stoichiometry helps determine the correct coefficients needed to balance the equation, ensuring that the quantities of iron and water produced are accurately represented.
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