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
551–560 of 991
Question 551
1 mark · Easy
Answer and see the solution →How many electrons are in the outer shell of an oxide ion (O^{2-})?
Question 552
3 marks · Easy
Answer and see the solution →This question is about the ionic bonding in magnesium oxide.
(a)[2 marks]Describe what happens to the electrons when magnesium and oxygen react to form magnesium oxide.
(b)[1 mark]Explain why there are strong forces of attraction between the ions in magnesium oxide.
Question 553
2 marks · Easy
Answer and see the solution →A magnesium atom has 12 electrons and an oxide ion has 10 electrons. Calculate the total number of electrons present in one unit of magnesium oxide (MgO).
Question 554
2 marks · Normal
Answer and see the solution →State the charge that a magnesium ion and an oxide ion have in magnesium oxide. Give both ion symbols.
Question 555
4 marks · Normal
Answer and see the solution →This question is about magnesium oxide.
(a)[3 marks]Draw a dot-and-cross diagram to show the ionic bonding in magnesium oxide (MgO). Clearly show all the electrons, their arrangement, and the charges on the ions.
(b)[1 mark]Why are both ions in MgO drawn with full outer shells?
Question 556
3 marks · Normal
Answer and see the solution →Explain, using charges, why strong electrostatic attraction exists between the ions in magnesium oxide (MgO), and calculate the charge difference between a Mg^{2+} ion and an O^{2-} ion.
Question 557
3 marks · Normal
Answer and see the solution →Explain how magnesium and oxygen atoms form ions when magnesium reacts with oxygen. Include reference to electrons and charges.
Question 558
4 marks · Normal
Answer and see the solution →The table below shows the number of electrons in the outer shell for atoms and the resulting ions in magnesium oxide.
Particle Electrons in Outer Shell Mg atom 2 Mg ion 8 O atom 6 O ion 8 (a)[2 marks]Using the data, explain how the outer shell electron configuration changes for magnesium and oxygen when MgO forms.
(b)[2 marks]How does this information support the use of dot-and-cross diagrams in representing magnesium oxide?
Question 559
1 mark · Normal
Answer and check →What is the main reason magnesium oxide is held together as an ionic compound?
- A.Electrons are shared between the Mg and O atoms.
- B.Positive and negative ions are strongly attracted by electrostatic forces.
- C.Both ions have full outer shells.
- D.Magnesium and oxygen atoms form covalent bonds.
Question 560
2 marks · Normal
Answer and see the solution →What is the name and symbol for the negatively charged ion formed when oxygen gains electrons?