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
301–310 of 407 · Easy
Question 301
3 marks · Easy
Answer and see the solution →(a)[1 mark]Describe the structure of diamond in terms of the arrangement of its carbon atoms.
(b)[1 mark]Describe the structure of graphite in terms of the arrangement of its carbon atoms.
(c)[1 mark]State the type of structure present in C60 fullerene.
Question 302
2 marks · Easy
Answer and see the solution →Diamond has a melting point of about 3550 °C, while C60 fullerene melts at about 280 °C. Use these values to explain, in terms of bonding, why diamond has such a high melting point compared to C60 fullerene.
Question 303
2 marks · Easy
Answer and see the solution →Explain why C60 fullerene does not conduct electricity as well as graphite, referring to their structures.
Question 304
3 marks · Easy
Answer and see the solution →Bonding and Atomic Arrangement Carbon Allotrope Number of covalent bonds per carbon atom Type of structure Diamond Graphite C60 fullerene Complete the table by filling in the number of covalent bonds per carbon atom and the type of structure for each allotrope.
Question 305
1 mark · Easy
Answer and see the solution →State why graphite is soft.
Question 306
3 marks · Easy
Answer and see the solution →(a)[1 mark]State the electrical conductivity for each of the following carbon structures: diamond, graphite, and C60 fullerene.
(b)[1 mark]Explain why diamond does not conduct electricity.
(c)[1 mark]Explain why graphite conducts electricity.
Question 307
2 marks · Easy
Answer and see the solution →C60 fullerene contains 60 carbon atoms. If each carbon atom forms 3 bonds, calculate the total number of covalent bonds in one C60 molecule.
Question 308
5 marks · Easy
Answer and see the solution →(a)[1 mark]Define a covalent bond.
(b)[2 marks]Explain, in terms of electrostatic attraction, how a covalent bond holds two atoms together.
(c)[1 mark]State one reason why many substances with simple molecular structures have low melting points.
(d)[1 mark]Methane, CH, is a gas at room temperature. Explain why, using your knowledge of bonding and structure.
Question 309
5 marks · Easy
Answer and see the solution →(a)[2 marks]Draw a dot-and-cross diagram to show the bonding in a molecule of hydrogen chloride (HCl).
(b)[1 mark]State how many covalent bonds are present in a molecule of hydrogen chloride.
(c)[2 marks]Chlorine is a gas at room temperature, but water (HO) is a liquid. Using ideas about relative molecular mass, explain this difference.
Question 310
5 marks · Easy
Answer and see the solution →(a)[2 marks]Hydrogen (H) and carbon dioxide (CO) are both covalent molecules. Calculate the relative molecular mass (M) of each molecule. (Relative atomic masses: H = 1, C = 12, O = 16)
(b)[2 marks]Which of these molecules would you expect to have a higher boiling point? Explain your answer in terms of molecular mass and intermolecular forces.
(c)[1 mark]State the type of bonding present in both hydrogen and carbon dioxide molecules.