Ch.2 - Atoms & ElementsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: Hydrogen sulfide is composed of two elements: hydrogen and sulfur. In an experiment, 6.700 g of hydrogen sulfide is fully decomposed into its elements.What fundamental law does this experiment demonstrate?

Solution: Hydrogen sulfide is composed of two elements: hydrogen and sulfur. In an experiment, 6.700 g of hydrogen sulfide is fully decomposed into its elements.What fundamental law does this experiment demonst

Problem

Hydrogen sulfide is composed of two elements: hydrogen and sulfur. In an experiment, 6.700 g of hydrogen sulfide is fully decomposed into its elements.

What fundamental law does this experiment demonstrate?

Solution

We’re being asked to determine the fundamental law involved in the demonstrated experiment.


Recall the modern atomic theory that states that matter is composed of small, indivisible particles called atoms. The basis of this theory are the following fundamental laws.

  • The Law of Conservation of Mass states that matter can neither be created nor destroyed, all that happens is that it changes forms.
  • The Law of Definite Proportions states that no matter where you obtain a compound, whether it’s from a lab experiment or from the collection out in the field, the ratio of elements in it will remain constant.
  • The Law of Multiple Proportions states that when element A and element B combine they can form different compounds in different ratios to one another. Dividing these different ratios should generate a whole number answer.


Given: Hydrogen sulfide is composed of two elements: hydrogen and sulfur. In an experiment, 6.700 g of hydrogen sulfide is fully decomposed into its elements.

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