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Questions and Answers
What is an oxide?
What is an oxide?
- A chemical compound containing oxygen in the oxidation state of 0
- A chemical compound containing at least one oxygen atom and one other element (correct)
- A chemical compound containing oxygen in the oxidation state of +2
- A chemical compound containing only oxygen atoms
What is the oxidation state of oxygen in the oxide dianion?
What is the oxidation state of oxygen in the oxide dianion?
- −2 (correct)
- 0
- +2
- −1
What protects aluminium foil from further oxidation?
What protects aluminium foil from further oxidation?
- A layer of AlO
- A layer of oxygen atoms
- A thin skin of Al2O3 (passivation layer) (correct)
- A layer of pure aluminium
What is stoichiometry in the context of oxides?
What is stoichiometry in the context of oxides?
What is more common than binary oxides?
What is more common than binary oxides?
Who applied the term 'atom' to the basic units of mass of the chemical elements?
Who applied the term 'atom' to the basic units of mass of the chemical elements?
What does the term 'atom' mean in Greek?
What does the term 'atom' mean in Greek?
When did atomic theory gain widespread acceptance in the scientific community?
When did atomic theory gain widespread acceptance in the scientific community?
What did scientists realize about Dalton's so-called atoms?
What did scientists realize about Dalton's so-called atoms?
What does the term 'atom' now refer to when describing truly indivisible particles?
What does the term 'atom' now refer to when describing truly indivisible particles?
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Study Notes
Oxides and Stoichiometry
- An oxide is a compound containing oxygen in its -2 oxidation state.
- The oxidation state of oxygen in the oxide dianion is -2.
Properties of Oxides
- The thin layer of aluminium oxide protects aluminium foil from further oxidation.
Stoichiometry
- Stoichiometry in the context of oxides refers to the study of the quantitative relationships between reactants and products in chemical reactions involving oxides.
Types of Oxides
- Ternary oxides, which contain three elements, are more common than binary oxides, which contain two elements.
History of Atomic Theory
- The term 'atom' was applied to the basic units of mass of the chemical elements by John Dalton.
- The term 'atom' means 'indivisible' in Greek.
- Atomic theory gained widespread acceptance in the scientific community in the early 19th century.
- Scientists realized that Dalton's so-called atoms could be further divided into smaller particles, such as electrons, protons, and neutrons.
- Today, the term 'atom' refers to the smallest units of an element that still retain the properties of that element, which are truly indivisible particles.
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