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O Level Chemistry & IP Chemistry Notes by 10 Year Series Author – Chemistry Specialist

O Level Chemistry & IP Chemistry Notes by 10 Year Series Author - Chemistry Specialist

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O Level Chemistry: Assigning State Symbols in Chemical Equations (Exercise)

We have learned about balancing chemical equations as well as assigning of state symbols.

Let’s look at some examination questions and my suggested solutions.

Q) Write balanced chemical equations for each of the following reactions. Include the State Symbols.
(a) calcium + chlorine –> calcium chloride
(b) hydrogen + nitrogen –> ammonia
(c) ethane (C2H6) + oxygen –> carbon dioxide + water

My Suggested Answer:
(a) Ca(s) + Cl2(g) –> CaCl2(aq)

(b) 3H2(g) + N2(g) –> 2NH3(g)

(c) 2C2H6(g) + 7O2(g) –> 4CO2(g) + 6H2O(l)

Related Articles:

  • O-Level Chemistry: Assigning State Symbols in Chemical Equations
  • O Levels Chemistry Questions – Mole Calculations / Mole Concepts
  • O Level Chemistry Question: Chemical Bonding & Structural Properties
  • O Levels Chemistry – Selected Exam Questions
  • O-Level Chemistry: 5 Rules to Assign Oxidation States (Redox Reactions)

Sean Chua
Sean Chua
Winners Education Centre Pte. Ltd.
Many know me as the Ten Year Series book author for JC A-Level H2 Chemistry and O-Level Pure Chemistry. My 19+ years of coaching experience (since 1999) with more than 1500 students from 180+ JCs and Secondary Schools has allowed me to understand the true reasons why students are not able to perform well in Chemistry. Most importantly, my strength lies in using everyday analogies (even grandmothers can understand!) to simplify abstract concepts. Also, my teaching methodology has been designed to be fun, enjoyable and effective for my students. If you want to have an enjoyable time learning Chemistry and being motivated to excel in Chemistry, contact me today at 98287357

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Comments

  1. Oluwabukunmy says

    January 22, 2013 at 3:34 am

    Balancing a redox reaction:what are the necessary steps?

  2. Nyo Paing Naing Win says

    September 22, 2009 at 11:02 pm

    I need some stoichiometry questions.

  3. tiurma says

    July 4, 2008 at 12:58 pm

    Your answer is correct, balancing in stoichiometri and right in symbolyzing.i think you should be a proffesor in basic concept of chemistry.

    And thanks for your couraging emails. its make me survive in these difficult and bad people. hope you will always write more and more simple concept in chemistry for us.

    best regards from the biochemist.

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