Hydrogen peroxide, often used in solutions to cleanse cuts and scrapes, breaks down to yield water and oxygen: Hydrogen peroxide, H 2 O 2 (aq) → Hydrogen, H 2 (g) + Oxygen, O 2 (g) b. Which of the substances are chemical compounds, and which are elements?

Hello, everyone. Today, we're being given the following problem. Rust is formed by the reaction of iron and oxygen gas in the presence of water. And so we have the following reaction, identify the elements and compounds in the reaction. So first let's define what these terms mean. So an element can be defined as a something that is composed of just one type of atom. So it's only one type of atom. And then we have a compound and a compound is going to be two or more elements and they're typically gonna be bonded together. So if we look at our compound, if we look at our materials here, we have iron, it's only one sort or one type of atom. So we're gonna call iron an element. After iron, we have our oxygen gas. Once again, this is going to be an element. Since it is only composed of one type of atom, we have water here in the liquid form and it is composed of hydrogens and oxygens. So we can say that water is a compound and then we have rust that is going to be composed of this structure here. And of course, this is going to be a compound since there are more than one types of atoms in that. And the answer choice that best aligns with these definitions is going to be a, that iron is an element. Oxygen is a compound and the other compounds or the elements are going to be iron and oxygen and the compounds are going to be water and rust. And with that, we've answered this question overall, I hope it's helped. And until next time.

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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

Classification of Matter

GOB Chemistry

1. Matter and Measurements

Classification of Matter

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Problem 43b

Textbook Question

Hydrogen peroxide, often used in solutions to cleanse cuts and scrapes, breaks down to yield water and oxygen: Hydrogen peroxide, H₂O₂(aq) → Hydrogen, H₂(g) + Oxygen, O₂(g)
b. Which of the substances are chemical compounds, and which are elements?

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Identify the substances in the reaction: H₂O₂ (hydrogen peroxide), H₂ (hydrogen gas), and O₂ (oxygen gas).

Recall the definition of a chemical compound: A chemical compound is a substance composed of two or more different elements chemically bonded together in a fixed ratio.

Analyze H₂O₂ (hydrogen peroxide): It contains hydrogen (H) and oxygen (O) chemically bonded together, so it is a chemical compound.

Recall the definition of an element: An element is a pure substance consisting of only one type of atom, as found on the periodic table.

Analyze H₂ (hydrogen gas) and O₂ (oxygen gas): Both consist of only one type of atom (H and O, respectively), so they are elements.

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Key Concepts

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

Chemical Compounds

Chemical compounds are substances formed when two or more elements chemically bond together in fixed proportions. In the given reaction, hydrogen peroxide (H₂O₂) is a chemical compound because it consists of hydrogen and oxygen atoms bonded together. Compounds have distinct properties that differ from the individual elements that compose them.

Elements

Elements are pure substances that cannot be broken down into simpler substances by chemical means. They are the basic building blocks of matter and are represented on the periodic table. In the reaction provided, hydrogen (H₂) and oxygen (O₂) are elements, as they consist of only one type of atom and cannot be decomposed into simpler substances.

Chemical Reactions

Chemical reactions involve the transformation of reactants into products through the breaking and forming of chemical bonds. In the reaction given, hydrogen peroxide decomposes into water and oxygen, illustrating a chemical change. Understanding the nature of reactants and products is essential for identifying which substances are compounds and which are elements.

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Hydrogen peroxide, often used in solutions to cleanse cuts and scrapes, breaks down to yield water and oxygen: Hydrogen peroxide, H2O2(aq) → Hydrogen, H2(g) + Oxygen, O2(g) b. Which of the substances are chemical compounds, and which are elements?

Key Concepts

Chemical Compounds

Elements

Chemical Reactions

Watch next

Hydrogen peroxide, often used in solutions to cleanse cuts and scrapes, breaks down to yield water and oxygen: Hydrogen peroxide, H₂O₂(aq) → Hydrogen, H₂(g) + Oxygen, O₂(g)
b. Which of the substances are chemical compounds, and which are elements?