Passing electricity through compounds: electrolysis
2 marks · EasyThe formula of calcium chloride is . Explain which ions are present and give their names and charges.
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There is 1 Ca^{2+} ion (calcium cation, +2 charge) and 2 Cl^{-} ions (chloride anions, –1 charge each) in CaCl2.
Also accept: One calcium cation (Ca^{2+}), two chloride anions (Cl^–)
Common mistakes: Mixing up charges or names of ions
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Marking points
M1 · 1 mark · Identifies the cation (Ca^{2+}) and the anions (Cl^-).
A1 · 1 mark · Correct charges and correct identification (cation = +2, anion = –1).
Worked solution
contains one calcium ion (), a cation (+2), and two chloride ions (), which are anions (–1 each).