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
671–680 of 991
Question 671
4 marks · Normal
Answer and see the solution →The table below shows the electrical conductivity of three ionic compounds in solid and molten states.
Substance Conducts when solid? Conducts when molten? Potassium iodide Magnesium oxide Sodium nitrate Complete the table by indicating Yes or No for each box. Then, explain your reasoning for one of your answers.
Question 672
1 mark · Normal
Answer and check →Which of the following best explains why molten potassium bromide conducts electricity?
- A.The ions are free to move and carry charge.
- B.The electrons are free to move between ions.
- C.The molecules are able to gain or lose electrons.
- D.The atoms are bonded together covalently.
Question 673
2 marks · Normal
Answer and see the solution →State two states of ionic substances in which they conduct electricity. For each state, give a reason why conduction is possible.
Question 674
4 marks · Normal
Answer and see the solution →(a)[2 marks]Explain, using particles, why solid magnesium chloride does not conduct electricity.
(b)[2 marks]Describe what changes when magnesium chloride melts and how this allows conduction.
Question 675
2 marks · Hard
Answer and see the solution →Explain, in terms of ions, why solid sodium oxide does not conduct electricity.
Question 676
5 marks · Hard
Answer and see the solution →Lead(II) nitrate is an ionic compound. It can be either solid, molten, or dissolved in water.
(a)[2 marks]State whether lead(II) nitrate conducts electricity in each of the following states:
State Does it conduct? (Yes/No) Solid Molten Aqueous solution (b)[3 marks]Explain, in terms of ions, why lead(II) nitrate behaves in this way in these states.
Question 677
2 marks · Hard
Answer and see the solution →State the two conditions under which an ionic compound can conduct electricity.
Question 678
5 marks · Easy
Answer and see the solution →This question is about the formation of ions and charges in ionic bonding, including magnesium oxide and another compound.
(a)[1 mark]State the charge formed on a magnesium ion in magnesium oxide.
(b)[1 mark]Magnesium is in Group 2 of the Periodic Table. Explain why the charge on a magnesium ion is the value you stated in part (a).
(c)[1 mark]State the charge formed on the oxide ion in magnesium oxide.
(d)[1 mark]When potassium forms an ionic compound with chlorine, what is the formula of the ion formed by potassium? Include its charge.
(e)[1 mark]Explain, in terms of electrons, how a chlorine atom forms an ion.
Question 679
5 marks · Easy
Answer and see the solution →Ionic bonding depends on the strong attraction between oppositely charged ions. Magnesium oxide and aluminium oxide are two examples.
(a)[1 mark]State the charge on the magnesium ion and on the oxide ion in magnesium oxide.
(b)[2 marks]Explain why the electrostatic attraction in magnesium oxide is stronger than in sodium chloride.
(c)[1 mark]Aluminium oxide has the formula . State the charge on the aluminium ion and the oxide ion.
(d)[1 mark]Calculate the total positive charge and the total negative charge present in one formula unit of .
Question 680
5 marks · Easy
Answer and see the solution →This question is about common ions and how they are formed, using magnesium oxide and calcium fluoride as examples.
(a)[1 mark]Write the formula and charge of the ion formed by a magnesium atom.
(b)[1 mark]Explain why oxygen forms an ion with a negative charge.
(c)[1 mark]Calcium fluoride has the formula . What is the charge on a fluoride ion?
(d)[1 mark]Describe how calcium forms its ion. Mention what happens to its electrons.
(e)[1 mark]Sodium and sulphur can also form ions. Give the formula and charge of the ion formed by sulphur.