Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

5. Classification & Balancing of Chemical Reactions

Chemical Reaction: Chemical Change

GOB Chemistry

5. Classification & Balancing of Chemical Reactions

Chemical Reaction: Chemical Change

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2:21 minutes

Problem 17

Textbook Question

Reaction of A (green spheres) with B (blue spheres) is shown in the following diagram:

Which equation best describes the reaction?
a. A₂ + 2 B → A₂B₂
b. 10 A + 5 B₂ → 5 A₂B₂
c. 2 A + B₂ → A₂B₂
d. 5 A + 5 B₂ → 5 A₂B₂

Verified step by step guidance

Step 1: Analyze the diagram. In the left box, observe that the red spheres (A) are paired as A₂ molecules, and the purple spheres (B) are paired as B₂ molecules. In the right box, observe that each A₂ molecule has combined with a B₂ molecule to form A₂B₂ molecules.

Step 2: Count the number of molecules in the left box. There are 5 A₂ molecules and 5 B₂ molecules. This indicates a 1:1 ratio of A₂ to B₂ molecules.

Step 3: Count the number of molecules in the right box. There are 5 A₂B₂ molecules formed, which matches the number of reactants in the left box.

Step 4: Write the balanced chemical equation based on the observations. Since 5 A₂ molecules react with 5 B₂ molecules to form 5 A₂B₂ molecules, the equation is: 5 A₂ + 5 B₂ → 5 A₂B₂.

Step 5: Compare the balanced equation to the given options. The correct answer is d. 5 A + 5 B₂ → 5 A₂B₂.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Chemical Reaction

A chemical reaction involves the transformation of reactants into products through the breaking and forming of chemical bonds. In this context, the green spheres (A) and blue spheres (B) represent different chemical species that interact to form a new compound. Understanding the nature of these interactions is crucial for determining the correct chemical equation that describes the reaction.

Stoichiometry

Stoichiometry is the calculation of reactants and products in chemical reactions based on the conservation of mass. It allows chemists to predict the quantities of substances consumed and produced in a reaction. In this question, stoichiometric coefficients in the proposed equations indicate the ratio of A and B that react to form the product, A₂B₂.

Molecular Representation

Molecular representation visually depicts the arrangement and interaction of atoms in a chemical reaction. The diagram shows how green and blue spheres (representing different atoms or molecules) rearrange during the reaction. Analyzing these representations helps in understanding the formation of products and is essential for selecting the correct chemical equation that accurately reflects the reaction process.

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