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Questions and Answers
How do compounds form?
How do compounds form?
Compounds form when elements bond together, either through ionic or covalent bonding.
What does a compound contain?
What does a compound contain?
A compound contains two or more different elements that are chemically bonded together.
Which of these best describes an ionic compound?
Which of these best describes an ionic compound?
- A type of mixture of various substances.
- Formed by sharing valence electrons between nonmetals.
- Involves the transfer of valence electrons from a metal to a nonmetal. (correct)
- Composed entirely of nonmetals.
Which of these statements about covalent compounds is true?
Which of these statements about covalent compounds is true?
Covalent compounds can contain both metals and nonmetals.
Covalent compounds can contain both metals and nonmetals.
What is the chemical formula for carbon dioxide?
What is the chemical formula for carbon dioxide?
What is the chemical formula for sodium chloride?
What is the chemical formula for sodium chloride?
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Study Notes
Periodic Table and Elements
- The modern periodic table organizes elements for easier understanding of their properties.
- Elements in the same vertical column (group) share known characteristics.
- Familiarity with the periodic table aids in classifying and identifying elements.
Chemical Compounds
- Chemical compounds form when elements bond with each other.
- Compounds are ubiquitous in daily life, existing in food, air, and various products.
- Compounds are composed of elements held together by electrostatic forces.
Types of Chemical Bonds
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Ionic Compounds:
- Formed when a metal (cation) transfers its valence electrons to a nonmetal (anion).
- Consist of both metals and nonmetals.
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Covalent Compounds:
- Formed when nonmetals share their valence electrons with other nonmetals.
- Involve only nonmetals.
Chemical Formula and Naming
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A chemical formula indicates the number and type of atoms in a compound.
- The chemical symbol denotes the type of atom, while subscripts show the number of each atom.
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Chemical names refer to the actual names of the elements in a compound.
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Examples:
- Carbon dioxide (CO2) illustrates a covalent compound, with one carbon and two oxygen atoms.
- Sodium chloride (NaCl) shows an ionic compound, consisting of sodium (Na) and chlorine (Cl).
Classification of Compounds
- Compounds can be categorized as ionic or covalent based on their chemical formulas and names.
- Familiarize with common compounds to identify their classifications effectively.
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