1. (a) (i) Titanium(IV) oxide is an ionic solid - Edexcel - GCSE Chemistry - Question 1 - 2019 - Paper 1
Question 1
1. (a) (i) Titanium(IV) oxide is an ionic solid.
Many ionic solids are soluble in water.
Titanium(IV) oxide is not soluble in water.
Its other physical properties ar... show full transcript
Worked Solution & Example Answer:1. (a) (i) Titanium(IV) oxide is an ionic solid - Edexcel - GCSE Chemistry - Question 1 - 2019 - Paper 1
Step 1
Predict one other physical property of titanium(IV) oxide that would be typical of ionic solids.
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Answer
One typical physical property of titanium(IV) oxide is its high melting point. Ionic compounds generally have high melting and boiling points due to the strong electrostatic forces between the ions.
Step 2
Deduce the charge of the titanium ion in titanium(IV) oxide.
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Answer
In titanium(IV) oxide (TiO₂), the total charge must equal zero. The oxide ion (O²⁻) has a charge of -2. Therefore, to balance this charge, the titanium ion must have a charge of +4.
Step 3
Particles less than 100 nanometres in size are classified as nanoparticles.
100 nanometres is
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