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 are... 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
Titanium(IV) oxide should have a high melting point and boiling point, which is characteristic of ionic solids 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
The charge of the titanium ion in titanium(IV) oxide (TiO<sub>2</sub>) is +4. This is determined by the oxidation state of titanium when it is in the +4 oxidation state to balance the -2 charge contributed by the two oxide ions (O<sup>2-</sup>).
Step 3
Particles less than 100 nanometres in size are classified as nanoparticles.
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