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
261–270 of 407 · Easy
Question 261
1 mark · Easy
Answer and see the solution →Name the forces that hold the ions together in a giant ionic lattice.
Question 262
3 marks · Easy
Answer and see the solution →Barium chloride (BaCl_2) is an ionic compound.
(a)[1 mark]Name the ions present in barium chloride.
(b)[1 mark]State one property of barium chloride that is linked to its structure.
(c)[1 mark]Explain how the structure of barium chloride leads to this property.
Question 263
2 marks · Easy
Answer and see the solution →Lithium oxide (Li_2O) is an ionic compound formed from lithium ions (Li^+) and oxide ions (O^{2-}).
How many electrons in total are transferred from lithium atoms to oxygen atoms to form one formula unit of lithium oxide? Show your working.
Question 264
1 mark · Easy
Answer and see the solution →State why crystals of sodium chloride have a regular shape.
Question 265
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 266
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 267
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 268
1 mark · Easy
Answer and see the solution →State why ionic compounds such as sodium chloride have high melting points.
Question 269
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 270
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.