Chemistry Quiz on Laws of Composition
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Questions and Answers

What does the Law of Definite Proportion state about pure compounds?

  • The elements in a pure compound can be combined in multiple ways.
  • The elements in a pure compound are always in the same ratio by volume.
  • The composition of a pure compound is always the same regardless of its source. (correct)
  • The mass of pure compounds varies with their source.

    • Which of the following accurately defines a physical change?

  • A change that results in a new substance being formed.
  • A change that always leads to an increase in temperature.
  • A change that can be observed or measured without altering the identity of matter. (correct)
  • A change that alters the chemical structure of a substance.

    • What principle does the Law of Multiple Proportions illustrate?

  • Atoms of different elements can combine in multiple different ratios to form compounds. (correct)
  • All compounds formed will contain the same elements in identical ratios.
  • The ratios of atoms in compounds are only observed in gaseous states.
  • Elements must combine in equal mass proportions only.

    • What does the Law of Conservation of Mass state?

    <p>The total mass of substances involved in a chemical reaction remains constant.</p> Signup and view all the answers

    Which of the following is an example of a chemical change?

    <p>Burning paper.</p> Signup and view all the answers

    Which of the following is an example of an intensive property?

    <p>Density</p> Signup and view all the answers

    What is defined as the amount of space occupied by an object?

    <p>Volume</p> Signup and view all the answers

    Which of the following substances has a cubic crystal system?

    <p>Sodium Chloride (NaCl)</p> Signup and view all the answers

    Which property is dependent on the amount of matter present?

    <p>Volume</p> Signup and view all the answers

    Which of the following best describes matter?

    <p>Anything that has mass and occupies space</p> Signup and view all the answers

    Which of the following is NOT an extensive property?

    <p>Boiling point</p> Signup and view all the answers

    Which of the following properties can be classified as intrinsic?

    <p>Melting point</p> Signup and view all the answers

    What is the relationship between mass and weight?

    <p>Weight is mass multiplied by gravity</p> Signup and view all the answers

    Which state of matter has a definite shape and volume?

    <p>Solid</p> Signup and view all the answers

    What is the primary characteristic of gases in terms of volume?

    <p>Indefinite volume</p> Signup and view all the answers

    Which of the following statements is true about compounds?

    <p>Composed of two or more elements chemically united</p> Signup and view all the answers

    Which state of matter exhibits weak intermolecular forces and allows for gliding motion?

    <p>Liquid</p> Signup and view all the answers

    What effect does increasing the pressure of a gas have on its solubility?

    <p>Increases solubility</p> Signup and view all the answers

    Which of the following best describes a pure substance?

    <p>Has a uniform and definite composition</p> Signup and view all the answers

    What happens to the solubility of a gas in a liquid when the particle size increases?

    <p>Decreases</p> Signup and view all the answers

    Which mixture characteristic involves substances not being chemically combined?

    <p>Mixture</p> Signup and view all the answers

    What is the term for the maximum amount of solute that can be dissolved in 100g of water?

    <p>Solubility</p> Signup and view all the answers

    Which theory describes acids as proton donors?

    <p>Bronsted-Lowry Theory</p> Signup and view all the answers

    How does an increase in temperature affect the solubility of a gas in a liquid?

    <p>It decreases solubility</p> Signup and view all the answers

    What happens when Gibbs Free Energy ($ abla G$) is less than zero?

    <p>The process is spontaneous</p> Signup and view all the answers

    In which scenario would increasing temperature increase the solubility of a solid solute?

    <p>When the reaction is endothermic</p> Signup and view all the answers

    What do Lewis acids and bases specifically involve in their interactions?

    <p>Electron donation and acceptance</p> Signup and view all the answers

    What does a catalyst do in a chemical reaction?

    <p>Speeds up the reaction or lowers activation energy</p> Signup and view all the answers

    What is indicated by a pH level greater than 7?

    <p>Basic solution</p> Signup and view all the answers

    What effect does increasing pressure have on a gas system according to gas laws?

    <p>Increasing pressure decreases the number of moles of gas.</p> Signup and view all the answers

    Which principle states that a system will adjust to minimize stress applied to an equilibrium?

    <p>Le Chatelier’s Principle</p> Signup and view all the answers

    Which of the following is true regarding the law of mass action?

    <p>The rate of reaction is proportional to the concentration of the reactants.</p> Signup and view all the answers

    In an endothermic reaction, where does the stress apply primarily in terms of temperature?

    <p>Shifts the equilibrium toward the products when heat is added.</p> Signup and view all the answers

    What is the result of adding more reactants to a chemical equilibrium according to Le Chatelier’s Principle?

    <p>The equilibrium shifts towards the products.</p> Signup and view all the answers

    What is Nuclear Fission?

    <p>The splitting of a heavy atom.</p> Signup and view all the answers

    Which unit of radioactivity is equivalent to one decay per second?

    <p>Becquerel (Bq)</p> Signup and view all the answers

    What happens to the volume of a gas when the pressure is decreased?

    <p>The volume increases.</p> Signup and view all the answers

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