Chapter 7 chemical formulas and chemical compounds answer key

Modern Chemistry Chapter 7 Chemical Formulas & Chemical Compounds

chapter 7 chemical formulas and chemical compounds answer key

Empirical vs Molecular Formula for Chemical Compounds

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A molecular formula is a representation of a molecule that uses chemical symbols to indicate the types of atoms followed by subscripts to show the number of atoms of each type in the molecule. A subscript is used only when more than one atom of a given type is present. Molecular formulas are also used as abbreviations for the names of compounds. The structural formula for a compound gives the same information as its molecular formula the types and numbers of atoms in the molecule but also shows how the atoms are connected in the molecule. The structural formula for methane contains symbols for one C atom and four H atoms, indicating the number of atoms in the molecule Figure 1.

For a molecular compound, the chemical formula reveals the number of atoms of each element contained in a single molecule of the compound. Example: Octane C 8 H 18 The subscript after the C indicates that there are 8 carbon atoms in the molecule. The subscript after the H indicates that there are 18 hydrogen atoms in the molecule. The subscript 3 refers to the unit. Note also that there is no subscript for sulfur: when there is no subscript next to an atom, the subscript is understood to be 1. Ions formed form a single atom are known as monatomic ions. Example: To gain a noble-gas electron configuration, nitrogen gains three electrons to form N 3- ions.

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Chapter 7 Chemical Formulas and Chemical Compounds

2.4 Chemical Formulas

We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you! Published by Jody Ball Modified over 3 years ago. C8H18 octane has 8 carbon and 18 hydrogen atoms.

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