English National Curriculum - Science
Mission Objectives
Identify positive and negative ions using chemical tests
Interpret results to determine unknown compounds
Evaluate reliability and confidence in identifications
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Words and meanings to learn
sulphates
negative ions with the formula SO₄²⁻
precipitate
a solid that forms when two solutions react together; it appears as a cloudy or powdery solid in the liquid
halides
negative ions formed from Group 7 elements (the halogens), such as chloride (Cl⁻), bromide (Br⁻) and iodide (I⁻)
ions
atoms or groups of atoms that have gained or lost electrons, giving them a positive or negative charge
risk assessment
a plan written before doing a practical to identify possible dangers, how likely they are, and how to reduce the risks
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