1. Matter and Measurements4h 29m
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 35m
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. Amines38m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 46m
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

1. Matter and Measurements

Classification of Matter

GOB Chemistry

1. Matter and Measurements

Classification of Matter

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1:19 minutes

Problem 1aTimberlake - 13th Edition

Textbook Question

Classify each of the following pure substances as an element or a compound: d. rust (Fe₂O₃)

Verified step by step guidance

Identify the chemical formula given: Fe₂O₃.

Recognize that Fe represents iron, which is an element.

Recognize that O represents oxygen, which is also an element.

Note that Fe₂O₃ is composed of more than one type of element (iron and oxygen).

Conclude that since Fe₂O₃ is made up of two different elements chemically combined, it is classified as a compound.

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Key Concepts

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

Elements

Elements are pure substances that consist of only one type of atom and cannot be broken down into simpler substances by chemical means. Each element is defined by its atomic number, which represents the number of protons in its nucleus. Examples include hydrogen (H), oxygen (O), and iron (Fe).

Compounds

Compounds are pure substances formed when two or more different elements chemically bond together in fixed proportions. They can be broken down into their constituent elements through chemical reactions. An example of a compound is water (H₂O), which consists of hydrogen and oxygen atoms.

Chemical Formulas

Chemical formulas represent the composition of a substance using symbols for the elements and numerical subscripts to indicate the number of atoms of each element present. For instance, rust is represented as Fe₂O₃, indicating it contains two iron (Fe) atoms and three oxygen (O) atoms, classifying it as a compound.