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

What is Chemistry?

GOB Chemistry

1. Matter and Measurements

What is Chemistry?

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1:26 minutes

Problem 29

Textbook Question

A container was found in the home of the victim that contained 120 g of ethylene glycol in 450 g of liquid. What was the percentage of ethylene glycol? Express your answer to the ones place.

Verified step by step guidance

Step 1: Understand the problem. The goal is to calculate the percentage of ethylene glycol in the liquid mixture. The formula for percentage composition is: \( \text{Percentage} = \frac{\text{Mass of component}}{\text{Total mass of mixture}} \times 100 \).

Step 2: Identify the given values. The mass of ethylene glycol is 120 g, and the mass of the liquid is 450 g. The total mass of the mixture is the sum of these two values: \( \text{Total mass} = 120 \text{ g} + 450 \text{ g} \).

Step 3: Substitute the values into the formula. Replace \( \text{Mass of component} \) with 120 g and \( \text{Total mass of mixture} \) with the calculated total mass from Step 2.

Step 4: Perform the division and multiplication. Divide the mass of ethylene glycol by the total mass of the mixture, then multiply the result by 100 to convert it into a percentage.

Step 5: Round the final percentage to the nearest ones place as instructed in the problem.

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Key Concepts

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

Percentage Calculation

Percentage is a way of expressing a number as a fraction of 100. To calculate the percentage of a component in a mixture, you divide the mass of the component by the total mass of the mixture and then multiply by 100. In this case, the percentage of ethylene glycol can be found by taking the mass of ethylene glycol and dividing it by the total mass of the liquid.

Mass of Components

Understanding the mass of individual components in a mixture is crucial for percentage calculations. In this scenario, the mass of ethylene glycol is 120 g, and the total mass of the liquid is 450 g. The total mass for the percentage calculation includes both the ethylene glycol and any other substances present in the liquid.

Significant Figures

Significant figures are important in scientific calculations to ensure precision and accuracy. When expressing the final answer, it is essential to consider the significant figures of the values used in the calculation. In this case, the answer should be rounded to the ones place, which means it should be expressed as a whole number without decimal points.

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Related Practice

Textbook Question

Refer to the pencil in Problem 1.31. Using the equivalent values in Table 1.8 as conversion factors, convert the length measured in inches to centimeters. Compare the calculated length in centimeters to the length in centimeters measured using the metric ruler. How do the two values compare? Explain any differences.

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Textbook Question

A container was found in Gloria's home that contains 140 g of ethylene glycol in 480 g of liquid. What is the percentage of ethylene glycol? Express your answer to the ones place.

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Multiple Choice

Suggest a name for the science that studies the physics of rocks and the earth.

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.