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

Law of Conservation of Mass

GOB Chemistry

5. Classification & Balancing of Chemical Reactions

Law of Conservation of Mass

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2:06 minutes

Problem 16

Textbook Question

Assume that the mixture of substances in drawing (a) undergoes a reaction. Which of the drawings (b)–(d) represent a product mixture consistent with the law of conservation of mass?

Verified step by step guidance

Step 1: Analyze the initial mixture in drawing (a). Count the number of red spheres and blue spheres. Note that red spheres represent one type of atom or molecule, and blue spheres represent another type.

Step 2: Apply the law of conservation of mass, which states that the total number of atoms must remain constant before and after the reaction. This means the number of red and blue spheres in the product mixture must equal the number in the reactant mixture.

Step 3: Examine drawings (b), (c), and (d) to determine if the total number of red and blue spheres matches the initial count in drawing (a). Ensure no spheres are lost or gained during the reaction.

Step 4: Check if the arrangement of spheres in the product mixtures (b, c, d) is consistent with a chemical reaction. For example, spheres may combine to form new molecules, but the total count of each type of sphere must remain unchanged.

Step 5: Identify which drawing(s) (b, c, or d) satisfy both the conservation of mass and the formation of new products. This will be the correct representation of the product mixture.

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Key Concepts

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

Law of Conservation of Mass

The Law of Conservation of Mass states that in a closed system, the total mass of reactants must equal the total mass of products in a chemical reaction. This principle implies that matter cannot be created or destroyed, only transformed. Therefore, when analyzing chemical reactions, it is essential to ensure that the number and type of atoms before and after the reaction remain constant.

Chemical Mixtures

A chemical mixture consists of two or more substances that are combined but not chemically bonded. In the context of a reaction, the initial mixture can undergo changes, resulting in new products. Understanding how these mixtures interact and change during a reaction is crucial for predicting the final composition and verifying adherence to the conservation of mass.

Visual Representation of Chemical Reactions

Visual representations, such as drawings or diagrams, can illustrate the arrangement and types of particles in a chemical reaction. These visuals help in understanding how reactants transform into products and can be used to assess whether the resulting mixture aligns with the Law of Conservation of Mass. Analyzing these representations allows for a clearer grasp of the changes occurring during the reaction.

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