Textbook Question
Which of the following equations are balanced? Balance those that need it.
a. CaC2 + 2 H2O → Ca(OH)2 +C2H2
b. C2H8N2 + 2 N2O4 → 2 N2 + 2 CO2 + 4 H2O
c. 3 MgO + 2 Fe → Fe2O3 + 3 Mg
d. N2O → N2 + O2
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Ch.5 Classification & Balancing of Chemical Reactions
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187
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Table of contents
- Ch.1 Matter and Measurements27
- Ch.2 Atoms and the Periodic Table20
- Ch.3 Ionic Compounds8
- Ch.4 Molecular Compounds23
- Ch.5 Classification & Balancing of Chemical Reactions12
- Ch.6 Chemical Reactions: Mole and Mass Relationships28
- Ch.7 Chemical Reactions: Energy, Rate and Equilibrium64
- Ch.8 Gases, Liquids and Solids24
- Ch.9 Solutions52
- Ch.10 Acids and Bases25
- Ch.11 Nuclear Chemistry22
- Ch.12 Introduction to Organic Chemistry: Alkanes57
- Ch.13 Alkenes, Alkynes, and Aromatic Compounds47
- Ch.14 Some Compounds with Oxygen, Sulfur, or a Halogen50
- Ch.15 Aldehydes and Ketones45
- Ch.16 Amines42
- Ch.17 Carboxylic Acids and Their Derivatives57
- Ch.18 Amino Acids and Proteins82
- Ch.19 Enzymes and Vitamins63
- Ch.20 Carbohydrates44
- Ch.21 The Generation of Biochemical Energy65
- Ch.22 Carbohydrate Metabolism45
- Ch.23 Lipids42
- Ch.24 Lipid Metabolism33
- Ch.25 Protein and Amino Acid Metabolism24
- Ch.26 Nucleic Acids and Protein Synthesis45
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187Not the one you use?Change textbook
Chapter 5, Problem 44a
When sodium metal is placed in water, the following change occurs: Sodium, Na(s) + Water, H2O(l) → Hydrogen, H2(g) + Sodium hydroxide, NaOH(aq)
a. Identify the reactants and products and their physical states
Verified step by step guidance1
Step 1: Identify the reactants in the given chemical equation. Reactants are the substances present on the left side of the arrow. In this case, the reactants are sodium (Na) and water (H₂O).
Step 2: Identify the physical states of the reactants. Sodium (Na) is a solid, denoted as (s), and water (H₂O) is a liquid, denoted as (l).
Step 3: Identify the products in the given chemical equation. Products are the substances present on the right side of the arrow. In this case, the products are hydrogen gas (H₂) and sodium hydroxide (NaOH).
Step 4: Identify the physical states of the products. Hydrogen (H₂) is a gas, denoted as (g), and sodium hydroxide (NaOH) is an aqueous solution, denoted as (aq).
Step 5: Summarize the reactants and products with their physical states: Reactants: Sodium (Na (s)) and Water (H₂O (l)); Products: Hydrogen (H₂ (g)) and Sodium hydroxide (NaOH (aq)).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Reactants and Products
In a chemical reaction, reactants are the starting substances that undergo a change, while products are the substances formed as a result of the reaction. In the given equation, sodium (Na) and water (H2O) are the reactants, and hydrogen gas (H2) and sodium hydroxide (NaOH) are the products.
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Physical States
The physical state of a substance indicates its form at a given temperature and pressure, typically categorized as solid (s), liquid (l), gas (g), or aqueous (aq). In the reaction, sodium is a solid (s), water is a liquid (l), hydrogen is a gas (g), and sodium hydroxide is in an aqueous solution (aq).
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Chemical Equation
A chemical equation is a symbolic representation of a chemical reaction, showing the reactants on the left and the products on the right, separated by an arrow. It conveys the conservation of mass, indicating that the number of atoms of each element is the same before and after the reaction, which is essential for balancing the equation.
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Related Practice
Textbook Question
Many pharmaceuticals are marketed with the designation "HCl" appended to the name of the drug. What does the "HCl" mean? What type of reaction would be involved in converting a drug to the HCl form? What are the advantages of this form of the drug?
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Textbook Question
Why is it not possible to balance an equation by changing the subscript on a substance, say from H2O to H2O2?
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Textbook Question
What is meant by the term 'balanced equation'?
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Textbook Question
In each of the following, tell whether the substance gains electrons or loses electrons in a redox reaction:
a. An oxidizing agent
b. A reducing agent
c. A substance undergoing oxidation
d. A substance undergoing reduction
Textbook Question
High temperature combustion processes, such as in combustion engines and coal-fired power plants, can result in the reaction of nitrogen and sulfur with oxygen to form nitrogen oxides (NO𝓍) and sulfur oxides (SO𝓍), where x can vary. These NO𝓍 and SO𝓍 compounds subsequently undergo further reaction in the atmosphere to create acidic compounds that contribute to acid rain.
a. Do some research to determine the common products that are formed (i.e., what are the values of x) for the reactions of N and S with oxygen. Write balanced equations for these reactions.
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