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
561–570 of 991
Question 561
4 marks · Normal
Answer and see the solution →This question is about the bonding in magnesium oxide.
(a)[2 marks]Complete the dot-and-cross diagram for the oxide ion (O^{2-}) formed from an oxygen atom during the bonding in MgO. Show the arrangement of electrons in its outer shell after the transfer.
(b)[2 marks]Explain why the oxide ion has a 2- charge after bonding occurs.
Question 562
2 marks · Hard
Answer and see the solution →Describe how a dot-and-cross diagram can be used to show the formation of magnesium oxide (MgO) from magnesium and oxygen atoms. Your answer should include arrangements and charges.
Question 563
5 marks · Hard
Answer and see the solution →This question is about the ionic bonding in magnesium oxide (MgO).
(a)[1 mark]State which ions are present in magnesium oxide and what charges they carry.
(b)[2 marks]Explain in detail why there is a strong electrostatic force between these ions.
(c)[2 marks]Suggest, with a reason, how the strength of ionic bonding in magnesium oxide would change if the oxide ions were replaced by fluoride ions (F^-).
Question 564
2 marks · Hard
Answer and see the solution →State the ion formed when a magnesium atom loses electrons, and give its charge. What type of ion is this called?
Question 565
1 mark · Easy
Answer and see the solution →State the charge on the ion formed by a chlorine atom.
Question 566
3 marks · Easy
Answer and see the solution →(a)[1 mark]State the group number of a magnesium atom in the periodic table.
(b)[1 mark]Describe what happens to a magnesium atom when it forms an ion.
(c)[1 mark]State the charge on the ion formed.
Question 567
2 marks · Easy
Answer and see the solution →A fluorine atom (atomic number 9) forms a fluoride ion. Calculate: (i) The number of protons in the fluoride ion. (ii) The number of electrons in the fluoride ion. Give both answers.
Question 568
2 marks · Easy
Answer and see the solution →Explain, using electronic configuration, why a potassium ion (K+) has the same number of electrons as an argon atom.
Question 569
3 marks · Easy
Answer and see the solution →Information about elements and their ions Element Group number Atomic number Ion formed Number of electrons in ion Calcium 2 20 Ca2+ Chlorine 7 17 Cl– Aluminium 3 13 Al3+ (a)[3 marks]Complete the table by giving the number of electrons in each ion.
Question 570
1 mark · Easy
Answer and see the solution →Which ion is formed when a nitrogen atom gains three electrons? Give the symbol, including charge.