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

9. Solutions

Solutions

GOB Chemistry

9. Solutions

Solutions

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3:54 minutes

Problem 1c

Textbook Question

Classify the following liquid mixtures as heterogeneous or homogeneous. Further classify each homogeneous mixture as a solution or colloid.
c. Hand lotion

Verified step by step guidance

Step 1: Understand the definitions of heterogeneous and homogeneous mixtures. A heterogeneous mixture has visibly different components or phases, while a homogeneous mixture has a uniform composition throughout.

Step 2: Recall the definitions of solutions and colloids. A solution is a homogeneous mixture where the solute particles are molecular or ionic in size (less than 1 nm) and cannot scatter light. A colloid is also a homogeneous mixture, but the dispersed particles are larger (1–1000 nm) and can scatter light (Tyndall effect).

Step 3: Analyze the composition of hand lotion. Hand lotion appears uniform to the naked eye, indicating it is a homogeneous mixture.

Step 4: Determine whether hand lotion is a solution or a colloid. Hand lotion contains dispersed particles that are larger than those in a solution and can scatter light, which is characteristic of a colloid.

Step 5: Conclude that hand lotion is a homogeneous mixture and further classify it as a colloid based on the size of its dispersed particles and its ability to scatter light.

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Key Concepts

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

Heterogeneous Mixtures

Heterogeneous mixtures are composed of different components that can be physically distinguished. In these mixtures, the individual substances retain their own properties and can often be separated by mechanical means. An example is a salad, where the various ingredients are easily identifiable and separable.

Homogeneous Mixtures

Homogeneous mixtures have a uniform composition throughout, meaning that the individual components are not distinguishable. These mixtures appear consistent and are often referred to as solutions. An example is saltwater, where the salt is completely dissolved in the water, creating a single-phase mixture.

Colloids

Colloids are a specific type of homogeneous mixture where tiny particles are dispersed throughout a medium but do not settle out over time. These particles are larger than those in a solution but smaller than those in a suspension. An example of a colloid is milk, which contains fat globules dispersed in water, giving it a consistent appearance without separation.

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