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
761–770 of 991
Question 761
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 762
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 763
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 764
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 765
2 marks · Normal
Answer and see the solution →Potassium is a metal.
Draw a labelled diagram to show the arrangement of particles in a metallic lattice of potassium. You may use dots or circles to represent positive ions and crosses or small circles to represent delocalised electrons.
Question 766
4 marks · Normal
Answer and see the solution →Read the statements about metallic bonding and answer the questions.
(a)[1 mark]State what holds the particles together in a metallic lattice.
(b)[1 mark]Describe what is meant by the term 'delocalised electrons'.
(c)[2 marks]Explain why positively charged ions do not move apart in a metal.
Question 767
3 marks · Normal
Answer and see the solution →The melting point of magnesium (Group 2) is much higher than that of sodium (Group 1).
Using information about metallic bonding, calculate the number of delocalised electrons contributed per atom in each metal, and explain how this relates to their melting points.
Question 768
3 marks · Normal
Answer and see the solution →A student tries to represent a metallic lattice using the following statement:
'A metal is made up of separate molecules containing metal atoms.'
Does this statement accurately describe a metallic lattice? Give reasons for your answer, and describe the actual arrangement of particles in a metallic lattice.
Question 769
4 marks · Normal
Answer and see the solution →The table below shows data for three metals.
Properties of three metals Metal Ion formed Number of delocalised electrons per atom Melting point (°C) Sodium Na+ 1 98 Magnesium Mg2+ 2 650 Aluminium Al3+ 3 660 Use the data to answer the questions.
(a)[1 mark]For sodium, write the charge on the ion and state how many delocalised electrons each atom provides.
(b)[2 marks]Explain, using the table, why magnesium has a much higher melting point than sodium.
(c)[1 mark]Suggest, using the data, why aluminium and magnesium have similar melting points despite aluminium having a higher ion charge.
Question 770
1 mark · Normal
Answer and check →Which property of metals is directly explained by the presence of delocalised electrons in their structure?
- A.High density
- B.Shiny appearance
- C.Electrical conductivity
- D.High boiling point