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IGCSE · Chemistry
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Why do ionic compounds have high melting points?

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They have a giant ionic lattice held together by strong electrostatic forces of attraction between oppositely charged ions. A large amount of energy is needed to overcome those forces, so the melting point is high.

Cambridge tip

Name the lattice and the forces. Answers that say only “strong bonds” drop the mark.

Ask your tutor anything...Why do ionic compounds have high melting points?

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Chemistry_Ch5_Organic.pdf

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Q1mediumOrganic chemistry

Which statement best explains why alkanes are generally unreactive?

Solve a question

Curriculum

A-Level

Subject

Mathematics

Differentiate y = 3x² + 2x − 5 and find the stationary point.

Solution

  1. Differentiate term by term: dy/dx = 6x + 2
  2. A stationary point needs dy/dx = 0, so 6x + 2 = 0 and x = -1/3
  3. Substitute back: y = 3(-1/3)² + 2(-1/3) - 5 = -16/3
Mark scheme tip

Show dy/dx = 0 explicitly, then state the stationary point as a coordinate pair. The method mark is awarded even if the arithmetic slips.

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IGCSE Chemistry, Paper 4 style, 3 marks

Explain why ionic compounds have high melting points.

Generic AI

Default answer · No exam calibration

Ionic compounds have high melting points because they have strong bonds between the ions. It takes a lot of heat to break these bonds, so the melting point is high. They are often solids at room temperature.

Marks awarded1 / 3
GetTopMarks

Direct tutor · IGCSE Chemistry

Ionic compounds form a giant ionic lattice in which oppositely charged ions are held by strong electrostatic forces of attraction acting in all directions. A large amount of energy is required to overcome these forces, so the melting point is high.

Marks awarded3 / 3

IGCSE Maths, Paper 4 style, 4 marks

Solve 2x² + 5x − 4 = 0. Show all your working and give your answers correct to 2 decimal places.

Generic AI

Default answer · No exam calibration

Using the quadratic formula, x ≈ 0.6 or x ≈ −3.1.

Marks awarded1 / 4
GetTopMarks

Direct tutor · IGCSE Maths

With a = 2, b = 5, c = −4, the discriminant is b² − 4ac = 25 + 32 = 57, so x = (−5 ± √57) / 4, giving x = 0.64 or x = −3.14 to 2 d.p.

Marks awarded4 / 4

IGCSE Biology, Paper 4 style, 3 marks

Explain what happens to a plant cell when it is placed in a concentrated sugar solution.

Generic AI

Default answer · No exam calibration

The sugar solution is stronger than the inside of the cell, so water moves out by osmosis. The cell shrinks and goes floppy.

Marks awarded1 / 3
GetTopMarks

Direct tutor · IGCSE Biology

The sugar solution has a lower water potential than the cell contents, so water leaves by osmosis through the partially permeable membrane. The cytoplasm pulls away from the cell wall: the cell is plasmolysed and flaccid.

Marks awarded3 / 3
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Solve x² + 5x + 6 = 0 step by step

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Why do ionic compounds have high melting points?

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