Chemical Formulae And Equations
Muhtasari
Chemistry has its own shorthand. Instead of writing 'two hydrogen atoms bond with one oxygen atom to make water', chemists write H₂O. Instead of describing a reaction in a paragraph, they write a balanced equation that shows exactly what reacts and what is produced.
In this lesson you will learn how to write word equations and balanced symbol equations with state symbols, and how to calculate relative formula masses from relative atomic masses. These skills underpin almost every calculation you will meet in chemistry.
Malengo
- Write word equations and balanced chemical equations (including state symbols) for reactions studied in this specification and for unfamiliar reactions where suitable information is provided
- Calculate relative formula masses (including relative molecular masses) (Mr) from relative atomic masses (Ar)
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- What does the state symbol (aq) represent? A) Solid B) Liquid C) Gas D) Dissolved in water Answer: D
- When balancing a chemical equation, you should adjust: A) The subscripts in formulae B) The coefficients in front of formulae C) The symbols of the elements D) The state symbols Answer: B
- What is the relative formula mass of CO2? (Ar: C = 12, O = 16) A) 28 B) 32 C) 44 D) 48 Answer: C
- In the equation 2H2 + O2 -> 2H2O, how many oxygen atoms are on the left side? A) 1 B) 2 C) 3 D) 4 Answer: B
- Which of these is a correctly balanced equation? A) H2 + O2 -> H2O B) 2H2 + O2 -> 2H2O C) H2 + O2 -> 2H2O D) 2H2 + 2O2 -> 2H2O 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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