Textbook Question
Consider the stable elements through lead (Z = 82). In how many instances are the atomic weights of the elements out of order relative to the atomic numbers of the elements?
Ch.7 - Periodic Properties of the Elements
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970
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Table of contents
- Ch.1 - Introduction: Matter, Energy, and Measurement146
- Ch.2 - Atoms, Molecules, and Ions200
- Ch.3 - Chemical Reactions and Reaction Stoichiometry176
- Ch.4 - Reactions in Aqueous Solution155
- Ch.5 - Thermochemistry126
- Ch.6 - Electronic Structure of Atoms131
- Ch.7 - Periodic Properties of the Elements126
- Ch.8 - Basic Concepts of Chemical Bonding123
- Ch.9 - Molecular Geometry and Bonding Theories143
- Ch.10 - Gases147
- Ch.11 - Liquids and Intermolecular Forces91
- Ch.12 - Solids and Modern Materials122
- Ch.13 - Properties of Solutions126
- Ch.14 - Chemical Kinetics174
- Ch.15 - Chemical Equilibrium101
- Ch.16 - Acid-Base Equilibria139
- Ch.17 - Additional Aspects of Aqueous Equilibria146
- Ch.18 - Chemistry of the Environment72
- Ch.19 - Chemical Thermodynamics129
- Ch.20 - Electrochemistry142
- Ch.21 - Nuclear Chemistry101
- Ch.22 - Chemistry of the Nonmetals68
- Ch.23 - Transition Metals and Coordination Chemistry66
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry10
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Not the one you use?Change textbook
Chapter 7, Problem 77a,b,c
Write a balanced equation for the reaction that occurs in each of the following cases: (a) White phorphrous, P4(s), reacts with chlorine gas. (b) Sodium metal reacts with water. (c) Sulfur reacts with hydrogen gas.
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Identify the reactants: sulfur (S) and hydrogen gas (H₂).
Determine the product: sulfur reacts with hydrogen to form hydrogen sulfide (H₂S).
Write the unbalanced chemical equation: S + H₂ → H₂S.
Count the number of each type of atom on both sides of the equation to ensure they are equal.
Balance the equation by adjusting coefficients: S + H₂ → H₂S is already balanced as there is one sulfur atom and two hydrogen atoms on each side.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Chemical Reactions
A chemical reaction involves the transformation of reactants into products through the breaking and forming of chemical bonds. In this case, sulfur and hydrogen gas will react to form a new compound. Understanding the types of reactions, such as synthesis, decomposition, or combustion, is essential for predicting the products formed.
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Chemical Properties
Balancing Chemical Equations
Balancing a chemical equation ensures that the number of atoms for each element is the same on both sides of the equation, adhering to the law of conservation of mass. This process involves adjusting coefficients in front of the chemical formulas to achieve balance, which is crucial for accurately representing the reaction.
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Formation of Hydrogen Sulfide
When sulfur reacts with hydrogen gas, the primary product formed is hydrogen sulfide (H2S). This compound is a colorless gas with a characteristic odor of rotten eggs. Recognizing the products of specific reactants helps in writing the correct balanced equation for the reaction.
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Related Practice
Textbook Question
Little is known about the properties of astatine, At, because of its rarity and high radioactivity. Nevertheless, it is possible for us to make many predictions about its properties. (c) What is the chemical formula of the compound it forms with Na?
Textbook Question
Write a balanced equation for the reaction that occurs in each of the following cases: (d) Fluorine reacts with water.
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