Chemistry Catalysts and Haber Process

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Questions and Answers

What is the molar mass of magnesium oxide (MgO)?

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How many moles of magnesium can be obtained from 15.5 grams?

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What is the ratio of magnesium to magnesium oxide in the balanced equation 2Mg + O₂ → 2MgO?

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What is the final mass of magnesium oxide produced from 15.5 g of magnesium?

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What is the first step in calculating the grams of magnesium oxide produced from magnesium?

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What is the mass of magnesium oxide produced when 20L of oxygen reacts completely with magnesium?

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How many moles of magnesium oxide are produced from 2 moles of magnesium?

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What value is obtained after multiplying 0.6458, 1, and 40, and rounding to two decimal places?

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What is the gas volume at STP for 1 mole of oxygen?

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Which chemical equation represents the reaction of magnesium with oxygen to form magnesium oxide?

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What is the primary function of a catalyst in a chemical reaction?

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Which of the following is an example of a negative catalyst?

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What is produced in the Haber process when nitrogen and hydrogen react?

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In a chemical equation, what does the coefficient indicate?

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What is the role of an iron catalyst in the Haber process?

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What are reactants in a chemical reaction?

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How does a subscript function in a chemical formula?

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Which of the following best describes the reaction 2Mg + O₂ → 2MgO?

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What does the symbol Δ represent in a chemical equation?

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Which type of reaction involves two or more elements combining to form a single product?

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In balancing chemical equations, which step is NOT part of the process?

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What does the Law of Conservation of Mass state?

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Which statement correctly describes a decomposition reaction?

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What could be indicated if a chemical reaction includes the notation (s)?

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Which equation correctly represents a double displacement reaction?

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Which of the following represents the correct interpretation of coefficients in a balanced equation?

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What is the correct balanced equation for the reaction of sodium and chlorine gas?

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In the reaction C₄H₁₀ + O₂ → CO₂ + H₂O, what are the coefficients for C₄H₁₀ and O₂ in the balanced equation?

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What is the balanced form of the equation Al(OH)₃ + H₂SO₄ → Al₂(SO₄)₃ + H₂O?

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How is the coefficient treated when it is placed outside parentheses in a chemical equation?

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What is the role of a plus sign in a chemical equation concerning coefficients?

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Which of the following represents a correct application of coefficients in the reaction NaOH + H₂CO₃ → Na₂CO₃ + H₂O?

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When balancing chemical equations, what generally must be increased to achieve balance?

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What happens if a coefficient is added to a subscript in the absence of a plus sign?

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What is the primary focus of stoichiometry in chemistry?

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Which of the following represents a correct way to express a molar conversion?

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What is the characteristic of a limiting reactant in a chemical reaction?

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When balancing the chemical equation for magnesium reacting with oxygen, what is the correct formula for magnesium oxide?

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What is the correct interpretation of molecular mass?

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If a student weighs out 15.5g of magnesium for a reaction, which conversion method should they use to find the grams of magnesium oxide produced?

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In the expression 2NaO₂, why is a coefficient used in front of NaO₂?

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What is one of the first steps to take before solving for a stoichiometric problem?

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Flashcards

Catalyst

A substance that speeds up a chemical reaction without being consumed or changed.

Haber Process

A method to produce ammonia from nitrogen and hydrogen gases using an iron catalyst.

Catalyst example

Iron is a catalyst in the Haber Process.

Chemical Equation

Shorthand representation of a chemical reaction using symbols and formulas.

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Reactants

The substances that react in a chemical reaction.

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Products

The substances formed as a result of a chemical reaction.

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Coefficient

The number placed in front of a chemical formula in a balanced equation, indicating relative amounts of reactants and products.

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Subscript

A number in a chemical formula that indicates the number of atoms of that element in the molecule.

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Combination/Synthesis Reaction

Two or more reactants combine to form a single product.

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Decomposition Reaction

A single reactant breaks down into simpler products.

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Single Displacement Reaction

One element replaces another element in a compound.

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Double Displacement Reaction

Ions in two compounds exchange places to form two new compounds.

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Law of Conservation of Mass

The total mass of reactants equals the total mass of products in a chemical reaction.

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Balancing Chemical Equations

Adjusting coefficients in a chemical equation to satisfy the Law of Conservation of Mass.

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Chemical Equation Coefficient

A number placed in front of a chemical formula to balance the number of atoms in a chemical equation.

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What is stoichiometry?

Stoichiometry is the study of quantitative relationships between reactants and products in chemical reactions. It helps us understand the amounts of substances involved in chemical reactions.

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What is a limiting reactant?

The limiting reactant is the reactant that limits the amount of product formed in a reaction. It gets used up completely before the other reactants.

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What is an excess reactant?

The excess reactant is the reactant that is left over after the reaction is complete because there is more than enough of it.

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What is a molar mass?

Molar mass is the mass of one mole of a substance. It's expressed in grams per mole (g/mol).

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What is molecular mass?

Molecular mass is the total mass of all atoms in a molecule. It's also expressed in grams per mole (g/mol).

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How do you balance a chemical equation?

Balancing a chemical equation involves adjusting the coefficients in front of each chemical formula so that the number of atoms for each element is the same on both sides of the equation.

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What's the difference between a coefficient and a subscript?

A coefficient is a number that appears in front of a chemical formula in a balanced equation. It indicates the number of molecules involved. A subscript appears within a chemical formula and indicates the number of atoms of a specific element in a molecule.

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What is a mole-to-mole conversion?

A mole-to-mole conversion involves using the stoichiometric coefficients from a balanced chemical equation to convert the moles of one substance to the moles of another.

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Balancing Chemical Equations with Coefficients

Adjusting the numerical coefficients in front of chemical formulas to ensure that the number of atoms of each element is equal on both sides of the equation.

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Coefficients in Balancing

Numbers placed before chemical formulas in a balanced equation. They multiply all subscripts within the formula.

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Subscripts in Chemical Formulas

Small numbers beneath the symbols of elements in a chemical formula that denote the number of atoms of each element in a molecule.

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Balancing Equations: Order-of-Operations with Coefficients and Parentheses

When elements are inside parentheses, multiply subscripts inside first by the coefficient before outside coefficient distribution.

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Balancing Equations: Handling Double Elements

Ensure correct accounting for repeated elements by distributing coefficients appropriately to balance atoms.

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Balanced Chemical Equation

A chemical equation where the number of atoms of each element is the same on both the reactant and product sides.

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Balancing with Parentheses

When balancing equations with parentheses, the coefficient outside the parenthesis multiplies everything inside the parenthesis first before distributing it the coefficient outside.

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Importance of Balancing Equations

Balancing chemical equations follows the law of conservation of mass, ensuring that the same number of each type of atom exists on both sides of the equation.

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Molar Mass

The mass of one mole of a substance, expressed in grams per mole (g/mol). It's calculated by adding the atomic masses of all atoms in a molecule.

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Mole Ratio

The ratio of moles of reactants and products in a balanced chemical equation. It represents the stoichiometric relationship between substances in a reaction.

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Converting Grams to Moles

This involves dividing the mass of a substance by its molar mass to find the number of moles present.

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Calculating Mass of Product

Using the mole ratio from a balanced equation and the molar masses of reactants and products, you can calculate the mass of a product formed in a reaction.

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Stoichiometry Calculation

A process that uses mole ratios from a balanced chemical equation to calculate the amounts of reactants and products in a chemical reaction.

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Why do we use mole ratios?

Mole ratios are derived from the balanced chemical equation and represent the relative amounts of reactants and products involved in a chemical reaction. They allow us to relate the quantities of different substances in a reaction.

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How to Calculate Mass of Product

  1. Convert grams of reactant to moles using molar mass.
  2. Use mole ratios from balanced equation to find moles of product.
  3. Convert moles of product to grams using molar mass.
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Study Notes

Catalyst

  • A catalyst is a substance that speeds up a reaction but remains chemically unchanged at the end.
  • Catalysts do not alter the equilibrium constant of a reaction.
  • Activators (positive catalysts) speed up reactions, while inhibitors (negative catalysts) slow them down.
  • Examples of activators include Manganese Dioxide (MnO2), Iron (Fe), and Vanadium Pentoxide (V2O5).
  • Examples of inhibitors include Phosphoric Acid (H3PO4), Sulfuric Acid (H2SO4), and Alcohols (like methanol and ethanol).

Haber's Process

  • The Haber process uses an iron catalyst to produce ammonia (NH3) from nitrogen (N2) and hydrogen (H2) gases.
  • The iron catalyst provides a surface for nitrogen and hydrogen to adsorb and react.
  • It facilitates the breaking of nitrogen's strong triple bond, allowing it to combine with hydrogen more readily.

Chemical Equations

  • A shorthand way to represent chemical reactions using symbols, numbers, and formulas.
  • Chemical equations have two key parts:
    • Reactants: Starting materials that change during the reaction.
    • Products: The new substances formed in the reaction.

Chemical Reaction Symbols

  • "+" signifies combining or mixing substances.
  • "→" means "yields" or "produces", separating reactants from products.
  • "↓" indicates a precipitate (solid formed during a reaction)
  • "↑" indicates gas formation.
  • "(s)" denotes a solid.
  • "(l)" denotes a liquid.
  • "(g)" denotes a gas.
  • "(aq)" denotes an aqueous solution (dissolved in water).
  • "Δ" indicates heat input.

Balancing Chemical Equations

  • The law of conservation of mass dictates that the mass of the reactants must equal the mass of the products.
  • Steps to balance an equation:
    • Identify the elements to be balanced.
    • Write down the elements and their subscripts, including those on the left (reactants) and right (products).
    • Find integers as coefficients for each element/compound such that the quantities of atoms of each element is the same on both sides of the equation.

Types of Chemical Reactions

  • Combination/Synthesis: Two or more reactants combine to form a single product (A + B → AB).
  • Decomposition: A single reactant breaks down into two or more products (AB → A + B).
  • Single Displacement/Replacement: One element replaces another element in a compound (A + BC → AC + B).
  • Double Displacement/Replacement: Two compounds exchange ions to form two new compounds (AB + CD → AD + CB).

Stoichiometry

  • Stoichiometry is the calculation of quantities in chemical reactions.
  • Stoichiometry calculations use mole ratios or ratios of coefficients to relate quantities.
  • Key conversions include moles to moles, moles to grams, and grams to grams.

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