Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Principles of Chemistry
991 practice questions
Topics covered
- States of Matter102 practice questions
- Elements, Compounds and Mixtures69 practice questions
- Atomic Structure108 practice questions
- The Periodic Table103 practice questions
- Chemical Formulae, Equations and Calculations Part 119 practice questions
- Chemical Formulae, Equations and Calculations Part 2144 practice questions
- Ionic Bonding143 practice questions
- Covalent Bonding68 practice questions
- Metallic Bonding19 practice questions
- Electrolysis198 practice questions
Practice questions
641–650 of 991
Question 641
3 marks · Easy
Answer and see the solution →(a)[1 mark]Name the two types of ions found in sodium chloride.
(b)[1 mark]Describe the arrangement of ions around a single sodium ion in the lattice.
(c)[1 mark]State whether sodium chloride exists as molecules or as a giant ionic lattice.
Question 642
2 marks · Easy
Answer and see the solution →Ionic compounds often form crystals. Explain why the crystalline property is linked to the structure of their ions.
Question 643
3 marks · Easy
Answer and see the solution →The table shows part of the arrangement of ions around a sodium ion in sodium chloride:
Ion Count Distance from central sodium ion (pm) Chloride ion 6 280 Sodium ion 12 400 Chloride ion 8 490 (a)[1 mark]What type of lattice is formed by sodium chloride?
(b)[1 mark]How many chloride ions are nearest to each sodium ion?
(c)[1 mark]Describe how the pattern of ions continues in the lattice.
Question 644
1 mark · Easy
Answer and see the solution →State why ionic compounds such as sodium chloride have high melting points.
Question 645
3 marks · Easy
Answer and see the solution →(a)[1 mark]What does it mean if a substance is described as 'crystalline'?
(b)[2 marks]Explain how the structure of sodium chloride leads to its crystalline appearance.
Question 646
2 marks · Easy
Answer and see the solution →The strong electrostatic forces between ions in an ionic lattice result in high melting points for ionic compounds.
Suppose it takes 780 kJ of energy to melt 1 mole of sodium chloride (NaCl). Calculate the energy required to melt 2.5 moles of sodium chloride.
Show your working and state the unit.
Question 647
2 marks · Easy
Answer and see the solution →In sodium chloride, each sodium ion (Na^+) is surrounded by 6 chloride ions (Cl^-).
Calculate the total number of chloride ions immediately surrounding sodium ions in a lattice that contains 4 sodium ions.
Show your working.
Question 648
2 marks · Normal
Answer and see the solution →Describe the arrangement of ions in the giant ionic lattice of sodium chloride.
Question 649
4 marks · Normal
Answer and see the solution →(a)[1 mark]State what holds the ions together in the lattice of an ionic compound such as sodium chloride.
(b)[2 marks]Explain, with reference to the lattice structure, why sodium chloride has a high melting point.
(c)[1 mark]Sodium chloride and magnesium oxide have similar lattice structures. Explain why magnesium oxide has a higher melting point.
Question 650
3 marks · Normal
Answer and see the solution →Explain why sodium chloride forms a giant ionic lattice instead of individual molecules. In your answer, refer to the charges on the ions and the overall structure.