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
251–260 of 423 · Normal
Question 251
2 marks · Normal
Answer and see the solution →Draw a dot-and-cross diagram to represent the ionic bonding in lithium fluoride.
Question 252
4 marks · Normal
Answer and see the solution →Calcium chloride is an ionic compound formed from calcium and chlorine.
(a)[1 mark]State the formula of the calcium ion and the chloride ion.
(b)[2 marks]Draw a dot-and-cross diagram to show how electrons are transferred when calcium reacts with chlorine to form calcium chloride.
(c)[1 mark]Explain why two chlorine atoms are needed for each calcium atom in this compound.
Question 253
2 marks · Normal
Answer and see the solution →Lithium fluoride forms when lithium reacts with fluorine. Draw a dot-and-cross diagram to show the ions present in lithium fluoride after the ionic bond has formed.
Question 254
3 marks · Normal
Answer and see the solution →(a) Lithium fluoride is formed when a lithium atom reacts with a fluorine atom. Each atom transfers electrons to form ions.
Draw a dot-and-cross diagram to show the ionic bonding in lithium fluoride. Label each ion clearly and show the charges.
Question 255
3 marks · Normal
Answer and see the solution →(a) Calcium chloride is formed when one calcium atom reacts with two chlorine atoms. Calcium transfers electrons to each chlorine atom.
Draw a dot-and-cross diagram to show the formation of calcium chloride. Label each ion and show their charges.
Question 256
4 marks · Normal
Answer and see the solution →A student attempts to draw the dot-and-cross diagram for lithium fluoride (LiF) but makes some mistakes. Examine the student’s diagram and answer the following questions.
(a)[2 marks]Student's dot-and-cross diagram for LiF Identify two mistakes in the student's dot-and-cross diagram for lithium fluoride.
(b)[2 marks]Draw a correct dot-and-cross diagram for lithium fluoride (LiF). Use dots (•) for lithium electrons and crosses (×) for fluorine electrons, or vice versa. Show only the outer shell electrons.
Question 257
1 mark · Normal
Answer and check →Which statement best describes the dot-and-cross diagram for calcium chloride (CaCl)?
- A.The calcium atom shares electrons equally with two chlorine atoms.
- B.The calcium atom transfers two electrons, one to each chlorine atom.
- C.Each chlorine atom gives an electron to the calcium atom.
- D.The calcium and chlorine atoms both lose all their outer shell electrons.
Question 258
4 marks · Normal
Answer and see the solution →Calcium chloride is an ionic compound formed from calcium and chlorine atoms.
(a)[1 mark]State the electronic configuration of a calcium atom and a chlorine atom.
(b)[1 mark]Describe, in terms of electron transfer, how calcium and chlorine form ions in calcium chloride.
(c)[2 marks]Draw a dot-and-cross diagram to show the ions present in calcium chloride (CaCl₂). Use dots (•) for calcium’s electrons and crosses (×) for chlorine’s electrons.
Question 259
2 marks · Normal
Answer and see the solution →State the formulae for the following ionic compounds:
(a)[1 mark]potassium sulfide
(b)[1 mark]aluminium nitrate
Question 260
4 marks · Normal
Answer and see the solution →The following ions are present in a solution: Ca2+, OH–, Fe3+, Cl–.
(a)[1 mark]Name the ionic compound formed when Ca2+ reacts with OH–.
(b)[1 mark]Write the formula of the compound formed between Ca2+ and OH–.
(c)[1 mark]Write the formula for the compound formed when Fe3+ reacts with Cl–.
(d)[1 mark]State why brackets are used in the formula for the compound formed between Ca2+ and OH–.