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
311–320 of 407 · Easy
Question 311
5 marks · Easy
Answer and see the solution →(a)[2 marks]Draw a dot-and-cross diagram to show the covalent bonding in a molecule of ammonia (NH).
(b)[2 marks]Explain why ammonia is a gas at room temperature, using your understanding of intermolecular forces.
(c)[1 mark]State how many lone pairs of electrons are present on the nitrogen atom in the ammonia molecule.
Question 312
1 mark · Easy
Answer and see the solution →State one reason why metals are good conductors of electricity.
Question 313
3 marks · Easy
Answer and see the solution →(a)[3 marks]Draw a simple 2D diagram to represent the metallic lattice of lithium metal. Label the positive metal ions and the sea of delocalised electrons.
Question 314
2 marks · Easy
Answer and see the solution →Explain why metals can be hammered into different shapes without breaking apart.
Question 315
3 marks · Easy
Answer and see the solution →Metals and their ion charges Metal Group Ion formed Sodium 1 Na+ Calcium 2 Ca2+ Aluminium 3 Al3+ Study the table above. For each metal, state how the charge on the ion relates to the number of delocalised electrons present in its metallic lattice.
Question 316
1 mark · Easy
Answer and see the solution →What type of force holds positive metal ions and delocalised electrons together in a metal lattice?
Question 317
3 marks · Easy
Answer and see the solution →(a)[3 marks]Copper is a useful metal in electrical wiring and making utensils. State and explain two properties of copper that are important for these uses.
Question 318
2 marks · Easy
Answer and see the solution →Each atom of lithium in solid lithium metal loses one electron to become a Li ion. In a piece of lithium metal containing lithium atoms, calculate the total number of delocalised electrons present.
Question 319
2 marks · Easy
Answer and see the solution →Draw a simple 2D diagram to represent the metallic lattice structure in a sample of rubidium metal. Clearly show and label the positive metal ions and sea of delocalised electrons.
Question 320
1 mark · Easy
Answer and see the solution →State whether solid potassium nitrate conducts electricity. Give your answer as 'yes' or 'no'.