Phases in chemical reactions - Chemical Reactions and Groups

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Phases in chemical reactions


• A fully detailed chemical equation should show the state (or phase) of matter that the chemical atoms are in.

• These states are:
\circ Solid, given the symbol (s)
\circ Liquid, given the symbol (l)
\circ Gas, given the symbol (g)
\circ Aqueous, meaning dissolved in water, and given the symbol (aq)

• The information is important for chemists moving from planning a reaction to performing the experiment. Knowing the state of the product helps plan how you can collect the products of the reaction being done.
• Crystals, powder and precipitate are all solid forms.

• Vapour is particles of a substance becoming the gas phase.

• A solution of a chemical would be described as aqueous. For example “a solution of HCl was reacted with a solution of NaOH” in an equation would be shown as “HCl(aq)+_{\;(aq)} + NaOH(aq)_{\;(aq)}

In this lesson, we will learn:
• The four phases that describe chemicals in reaction equations.
• Other key descriptive terms for chemicals in reactions.
• Practical reasons why state symbols are included in a chemical equation.
  • 1.
    Building on chemical equations
    • a)
    • b)
    • c)
    • d)
    • e)
    • f)
  • 3.
    Read the following experiment notes and write a balanced chemical equation, with state symbols, to describe what is happening.
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Phases in chemical reactions

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