Gr 10 Physical Sciences Ch 10: Law of constant composition

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Questions and Answers

What is the volume ratio of nitrogen to hydrogen gas in the synthesis of ammonia?

  • 1:3 (correct)
  • 1:2
  • 1:1
  • 2:3

What is the significance of the Law of Constant Composition in chemistry?

  • It calculates the amounts of reactants and products.
  • It emphasizes the fixed nature of chemical formulas. (correct)
  • It predicts the outcomes of gas reactions.
  • It simplifies stoichiometric calculations.

What is the outcome of the reaction between one volume of nitrogen gas and three volumes of hydrogen gas?

  • Four volumes of ammonia gas
  • Three volumes of ammonia gas
  • Two volumes of ammonia gas (correct)
  • One volume of ammonia gas

What is the importance of Gay-Lussac's Law of Combining Volumes in chemical reactions?

<p>It predicts the outcomes of reactions involving gases. (A)</p> Signup and view all the answers

What is the fundamental principle of the Law of Constant Composition?

<p>A chemical compound is always composed of the same elements in the same ratio. (D)</p> Signup and view all the answers

What is the common theme underlying the Law of Constant Composition and Gay-Lussac's Law of Combining Volumes?

<p>The consistent and predictable nature of chemical behavior. (A)</p> Signup and view all the answers

What is the main principle of the Law of Constant Composition?

<p>Elements always combine in the same fixed proportion by mass. (A)</p> Signup and view all the answers

What is the atomic ratio of hydrogen to oxygen in water (H_2O)?

<p>2:1 (C)</p> Signup and view all the answers

What is the mass proportion of oxygen in a water molecule?

<p>94% (A)</p> Signup and view all the answers

What is the Law of Combining Volumes also known as?

<p>Gay-Lussac's Law (D)</p> Signup and view all the answers

What is the condition for the Law of Combining Volumes to apply?

<p>Same temperature and pressure (C)</p> Signup and view all the answers

What is the product of the reaction between hydrogen and oxygen gases?

<p>Water vapor (B)</p> Signup and view all the answers

What is the difference between the formation of water and hydrogen peroxide?

<p>The ratio of hydrogen to oxygen is different (D)</p> Signup and view all the answers

What is the correct ratio of reactants in the synthesis of ammonia?

<p>1 volume of nitrogen gas reacts with 3 volumes of hydrogen gas (B)</p> Signup and view all the answers

What is the primary application of the Law of Constant Composition in chemical manufacturing?

<p>Ensuring consistency and purity in chemical manufacturing (B)</p> Signup and view all the answers

What is the primary significance of Gay-Lussac's Law of Combining Volumes in stoichiometric calculations?

<p>Simplifying stoichiometric calculations in gas reactions (C)</p> Signup and view all the answers

What is the underlying theme of the Law of Constant Composition and Gay-Lussac's Law of Combining Volumes?

<p>The predictable and consistent nature of chemical behavior (A)</p> Signup and view all the answers

What is the primary reason why the Law of Constant Composition is essential in identifying and characterizing substances?

<p>It emphasizes the fixed nature of chemical formulas (A)</p> Signup and view all the answers

What is the common goal of the Law of Constant Composition and Gay-Lussac's Law of Combining Volumes in chemistry?

<p>To provide a foundation for further studies and applications in chemistry (B)</p> Signup and view all the answers

What is the fundamental principle behind the Law of Constant Composition?

<p>Elements combine in a fixed proportion by mass. (B)</p> Signup and view all the answers

What is the mass proportion of oxygen in a water molecule?

<p>94% oxygen, 6% hydrogen (A)</p> Signup and view all the answers

What is the outcome of the reaction between two volumes of hydrogen gas and one volume of oxygen gas?

<p>Two volumes of water vapor (A)</p> Signup and view all the answers

What is the condition for the Law of Combining Volumes to apply?

<p>All gases must be measured at the same temperature and pressure. (B)</p> Signup and view all the answers

What is the difference between the atomic ratio of hydrogen to oxygen in water and hydrogen peroxide?

<p>The ratio is 2:1 in water and 1:1 in hydrogen peroxide. (C)</p> Signup and view all the answers

What is the significance of the Law of Combining Volumes in chemical reactions?

<p>It allows for the prediction of the volume of gaseous products. (D)</p> Signup and view all the answers

What is the example of a compound that has a different mass ratio of hydrogen to oxygen than water?

<p>Hydrogen peroxide (D)</p> Signup and view all the answers

What is the underlying principle of both the Law of Constant Composition and Gay-Lussac's Law of Combining Volumes?

<p>The principle of definite proportions. (A)</p> Signup and view all the answers

Which of the following statements is a direct consequence of the Law of Constant Composition?

<p>A sample of a compound always contains the same elements in the same ratio. (C)</p> Signup and view all the answers

What is the primary benefit of understanding the Law of Combining Volumes in stoichiometric calculations?

<p>It allows for the prediction of the outcomes of reactions involving gases. (C)</p> Signup and view all the answers

Which of the following is an implication of the Law of Constant Composition in chemical manufacturing?

<p>Ensuring consistency and purity in chemical manufacturing. (A)</p> Signup and view all the answers

What is the primary difference between the Law of Constant Composition and Gay-Lussac's Law of Combining Volumes?

<p>One deals with the composition of compounds, while the other deals with the volumes of gases. (D)</p> Signup and view all the answers

Which of the following reactions illustrates the Law of Combining Volumes?

<p>N2(g) + 3H2(g) → 2NH3(g) (C)</p> Signup and view all the answers

Why are the Laws of Constant Composition and Combining Volumes important in chemistry?

<p>They underscore the predictable and consistent nature of chemical behavior. (C)</p> Signup and view all the answers

What is the underlying assumption of the Law of Constant Composition?

<p>The mass ratio of elements in a compound is always fixed (B)</p> Signup and view all the answers

What is the significance of the Law of Combining Volumes in chemical reactions?

<p>It relates the volumes of reactant gases to the volumes of product gases (D)</p> Signup and view all the answers

What is the ratio of hydrogen to oxygen in hydrogen peroxide (H_2O_2)?

<p>1:1 (B)</p> Signup and view all the answers

What is the condition for the Law of Combining Volumes to apply?

<p>All gases must be measured at the same temperature and pressure (C)</p> Signup and view all the answers

What is the significance of the Law of Constant Composition in chemical reactions?

<p>It determines the mass ratio of elements in a compound (D)</p> Signup and view all the answers

What is the outcome of the reaction between two volumes of hydrogen gas and one volume of oxygen gas?

<p>Two volumes of water vapor (C)</p> Signup and view all the answers

What is the primary application of the Law of Combining Volumes in chemistry?

<p>Predicting the volume of gaseous products in a reaction (D)</p> Signup and view all the answers

What is the difference between the Law of Constant Composition and the Law of Combining Volumes?

<p>The Law of Constant Composition deals with the mass ratio of elements, while the Law of Combining Volumes deals with the volume ratio of gases (B)</p> Signup and view all the answers

What is the primary reason why the Law of Constant Composition is used to identify and characterize substances?

<p>To understand the fixed nature of chemical formulas (B)</p> Signup and view all the answers

Which of the following is an application of Gay-Lussac's Law of Combining Volumes in chemistry?

<p>Predicting the outcomes of reactions involving gases (B)</p> Signup and view all the answers

What is the common characteristic of the Law of Constant Composition and Gay-Lussac's Law of Combining Volumes?

<p>They both highlight the predictable and consistent nature of chemical behavior (B)</p> Signup and view all the answers

What is the role of the Law of Constant Composition in chemical manufacturing?

<p>To ensure consistency and purity in chemical manufacturing (D)</p> Signup and view all the answers

What is the primary benefit of understanding the Law of Constant Composition and Gay-Lussac's Law of Combining Volumes?

<p>To understand the fixed nature of chemical formulas and predict the outcomes of reactions involving gases (C)</p> Signup and view all the answers

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