Formulae
Muhtasari
A chemical formula is chemistry's shorthand: a few letters and numbers that capture exactly which atoms, and how many, make up a substance. From \(H_2O\) for water to \(C_6H_{12}O_6\) for glucose, formulae let chemists say precisely what something is and write equations that account for every atom in a reaction.
In this lesson you will learn to read and deduce formulae, tell a molecular formula from an empirical one, work out the formula of an ionic compound from the charges on its ions, and build balanced symbol equations with state symbols, including ionic equations. These are the skills every later topic relies on.
Malengo
- State the formulae of the elements and compounds named in the subject content.
- Define the molecular formula of a compound as the number and type of different atoms in one molecule.
- Deduce the formula of a simple compound from the relative numbers of atoms present in a model or a diagrammatic representation.
- Construct word equations and symbol equations to show how reactants form products, including state symbols.
- [Supplement] Define the empirical formula of a compound as the simplest whole number ratio of the different atoms or ions in a compound.
- [Supplement] Deduce the formula of an ionic compound from the relative numbers of the ions present in a model or a diagrammatic representation or from the charges on the ions.
- [Supplement] Construct symbol equations with state symbols, including ionic equations.
- [Supplement] Deduce the symbol equation with state symbols for a chemical reaction, given relevant information.
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- What does the molecular formula of a compound show? A. only the ratio of atoms B. the number and type of atoms in one molecule C. the mass of the compound D. the state of the compound Answer: B
- The empirical formula of C6H12O6 is: A. C6H12O6 B. CH2O C. CHO D. C2H4O2 Answer: B
- What is the formula of the compound formed from Mg2+ and Cl- ions? A. MgCl B. Mg2Cl C. MgCl2 D. Mg2Cl3 Answer: C
- Which state symbol means aqueous? A. (s) B. (l) C. (g) D. (aq) Answer: D
- In an ionic equation, ions that are unchanged on both sides are called: A. reacting ions B. spectator ions C. complex ions D. product ions Answer: B
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Sehemu ya kitabu
Writing and Balancing Chemical Equations
Derive chemical equations from narrative descriptions of chemical reactions.
"Chemistry: Writing and Balancing Chemical Equations" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/4-1-writing-and-balancing-chemical-equations. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
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Sehemu ya kitabu
Chemical Formulas
Symbolize the composition of molecules using molecular formulas and empirical formulas
"Chemistry: Chemical Formulas" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/2-4-chemical-formulas. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
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