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

1. Matter and Measurements

Dimensional Analysis

GOB Chemistry

1. Matter and Measurements

Dimensional Analysis

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1:59 minutes

Problem 70a

Textbook Question

Calcium citrate, Ca(C₆H₅O₇)₂(MW = 498.5 amu), is a common dietary supplement to provide calcium needed for strong teeth and bones.
a. Look up the recommended daily dietary intake of calcium for adult men and premenopausal women.

Verified step by step guidance

Step 1: Understand the problem. The question asks for the recommended daily dietary intake of calcium for adult men and premenopausal women. This is a conceptual question requiring reference to nutritional guidelines.

Step 2: Recognize that calcium is an essential mineral for bone health and other physiological functions. The recommended daily intake (RDI) varies by age, gender, and life stage.

Step 3: Consult reliable sources such as the National Institutes of Health (NIH) or the Dietary Guidelines for Americans to find the RDI for calcium. For adult men (ages 19–70), the RDI is typically 1,000 mg/day. For premenopausal women (ages 19–50), the RDI is also 1,000 mg/day.

Step 4: Note that these values are general recommendations and may vary slightly depending on the source or specific health conditions.

Step 5: Use this information to calculate the amount of calcium citrate supplement needed to meet the RDI, if required. For example, determine how much calcium is provided by a given mass of calcium citrate using its molecular weight and the proportion of calcium in the compound.

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Key Concepts

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

Calcium's Role in the Body

Calcium is an essential mineral that plays a critical role in various bodily functions, including the development and maintenance of strong bones and teeth, muscle contraction, and nerve transmission. It is vital for blood clotting and helps in the release of hormones and enzymes that are important for many bodily processes.

Recommended Dietary Allowance (RDA)

The Recommended Dietary Allowance (RDA) is a guideline that indicates the daily intake level of a nutrient considered sufficient to meet the requirements of most healthy individuals. For calcium, the RDA varies by age and gender, with specific recommendations for adult men and premenopausal women to ensure adequate intake for bone health.

Calcium Sources and Supplements

Calcium can be obtained from various dietary sources, including dairy products, leafy greens, and fortified foods. For individuals who may not get enough calcium from their diet, supplements like calcium citrate can be used. Understanding the bioavailability and absorption of different calcium forms is important for effective supplementation.

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Calcium citrate, Ca(C6H5O7)2(MW = 498.5 amu), is a common dietary supplement to provide calcium needed for strong teeth and bones. a. Look up the recommended daily dietary intake of calcium for adult men and premenopausal women.

Key Concepts

Calcium's Role in the Body

Recommended Dietary Allowance (RDA)

Calcium Sources and Supplements

Watch next

Calcium citrate, Ca(C₆H₅O₇)₂(MW = 498.5 amu), is a common dietary supplement to provide calcium needed for strong teeth and bones.
a. Look up the recommended daily dietary intake of calcium for adult men and premenopausal women.