Chemical Equations and Reactants Quiz
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Questions and Answers

If you react 4 units of A with 10 units of B in the given chemical equation, what is the relationship between the amounts of A and B?

  • The amounts of A and B are equivalent. (correct)
  • The amount of A is greater than the amount of B.
  • The amount of B is greater than the amount of A.
  • The amounts of A and B are not equivalent.

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

  • A catalyst has no effect on the rate of the chemical reaction.
  • A catalyst increases the amount of product formed in the reaction.
  • A catalyst increases the rate of reaction by increasing the activation energy.
  • A catalyst increases the rate of reaction by decreasing the activation energy. (correct)

    • Which of the following best describes a limiting reactant?

  • A limiting reactant is the reactant that determines how much product can be made. (correct)
  • A limiting reactant is the reactant that has the highest concentration.
  • A limiting reactant is the reactant that is added in the largest quantity.
  • A limiting reactant is the reactant that has the lowest concentration.

    • What is the result of adding neutrons to an atom's nucleus?

    <p>The atomic weight of the element is changed.</p> Signup and view all the answers

    Which of the following statements about the relationship between an element's atomic number and atomic weight is correct?

    <p>An element's atomic number determines the number of protons.</p> Signup and view all the answers

    In the chemical equation 2A + 5B → C + 3D, what is the largest amount of C that can be produced from 4 units of A and 10 units of B?

    <p>4 units</p> Signup and view all the answers

    Which of the following statements about catalysts is true?

    <p>A catalyst increases the rate of a reaction by providing an alternative pathway with lower activation energy.</p> Signup and view all the answers

    What is the purpose of a bulking agent in a product?

    <p>To add volume to the product without altering its quality.</p> Signup and view all the answers

    According to the collision theory, which of the following is a necessary condition for a chemical reaction to occur?

    <p>The reactants must collide with a minimum kinetic energy.</p> Signup and view all the answers

    Which of the following statements about capillary action is correct?

    <p>Capillary action is the result of cohesive forces between molecules of the same substance.</p> Signup and view all the answers

    Which of the following statements about ion-dipole interactions is correct?

    <p>Ion-dipole interactions occur between an ion and a polar molecule.</p> Signup and view all the answers

    Which of the following statements about the Big Bang Theory is correct?

    <p>The Big Bang Theory suggests that the universe began from a singularity and is expanding.</p> Signup and view all the answers

    Which of the following statements about carbon disulfide (CS2) is correct?

    <p>CS2 is an example of a non-polar covalent bond.</p> Signup and view all the answers

    If a detergent has a pH of 4.5, what can be said about its acidity?

    <p>The detergent is acidic.</p> Signup and view all the answers

    Which of the following statements about crushing a solid into a powder is correct?

    <p>Crushing a solid into a powder increases the reaction rate due to increased surface area.</p> Signup and view all the answers

    Study Notes

    Chemical Reactions

    • A catalyst increases the rate of a reaction by lowering the activation energy.
    • A limiting reactant determines how much product can be made.
    • In the equation 2A + 5B → C + 3D, if 4 units of A react with 10 units of B, there are equivalent amounts of A and B.

    Atomic Structure

    • An element's atomic number determines the number of protons.
    • An element's atomic weight determines the number of protons and neutrons.

    Molecular Interactions

    • Attraction between an ion and a polar molecule is the result of ion-dipole interaction.
    • Cohesive forces bring about capillary action and are attractions among different molecules.

    Chemical Bonding

    • CS2 is not an example of a polar covalent bond.

    Products and Manufacturing

    • An active ingredient provides the desired and specified effect of a product.
    • A bulking agent adds volume to a product without altering its quality.
    • In a tricycle factory, if 270 tires, 90 frames, and 170 pedals are available, tires would limit the number of complete tricycles that can be assembled.

    Cosmology

    • The Big Bang Theory suggests that the universe began from a singularity and its expansion.

    pH and Acidity

    • A pH of 4.5 is described as more acidic, as seen in Detergent W.

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    Description

    Test your knowledge on chemical equations, reactants, catalysts, limiting reactants, and compound formation. Includes questions on balancing equations, identifying limiting reactants, and understanding the role of catalysts in reactions.

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