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

What is Chemistry?

GOB Chemistry

1. Matter and Measurements

What is Chemistry?

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2:28 minutes

Problem 20Timberlake - 13th Edition

Textbook Question

b. An alloy contains 67 g of pure gold and 35 g of pure zinc. What is the percentage of zinc in the alloy? Express your answer to the ones place.

Verified step by step guidance

Calculate the total mass of the alloy by adding the mass of gold and the mass of zinc: Total mass = mass of gold + mass of zinc.

Use the formula for percentage composition to find the percentage of zinc in the alloy: Percentage of zinc = (mass of zinc / total mass of alloy) * 100.

Substitute the given values into the formula: mass of zinc = 35 g and total mass of alloy = 67 g + 35 g.

Perform the division and multiplication to find the percentage of zinc.

Round the result to the nearest ones place to express the percentage of zinc in the alloy.

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Key Concepts

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

Alloy Composition

An alloy is a mixture of two or more elements, where at least one is a metal. The composition of an alloy is typically expressed in terms of the weight or percentage of each component. In this case, the alloy consists of pure gold and pure zinc, and understanding the total mass of the alloy is essential for calculating the percentage of each component.

Percentage Calculation

Percentage is a way of expressing a number as a fraction of 100. To find the percentage of a component in a mixture, you divide the mass of that component by the total mass of the mixture and then multiply by 100. This calculation is crucial for determining the proportion of zinc in the alloy relative to the total mass.

Total Mass of the Alloy

The total mass of the alloy is the sum of the masses of its individual components. In this scenario, the total mass is calculated by adding the mass of gold (67 g) and the mass of zinc (35 g), resulting in a total mass of 102 g. This total is necessary for accurately calculating the percentage of zinc in the alloy.