How bonding and structure are related to the properties of substances exam tips

Exam tips

• Understand Ionic Conductivity

  Remember that ionic compounds conduct electricity when molten or dissolved in water because the ions are free to move.

  This understanding helps you explain the conditions under which ionic compounds can conduct electricity, which is a common exam question.

• Identify States of Small Molecules

  Remember that small molecular substances are typically gases or liquids at room temperature. Use this knowledge to predict their state in exam questions.

  This helps you quickly categorize substances and apply the correct properties related to their state, which is crucial for answering questions accurately.

• Understand Intermolecular Forces

  Remember to focus on the role of intermolecular forces in determining the melting and boiling points of small molecular substances. Link your answer to Properties of small molecules in How bonding and structure are related to the properties of substances, and keep the biology specific to melting point.

  This helps you explain why small molecular substances often have low melting points and low boiling points, as weaker intermolecular forces require less energy to overcome. This keeps revision aligned with the approved learning objective on explain why small molecular substances often have low melting points and low boiling points.

• Understand Intermolecular Forces

  When studying small molecular substances, focus on identifying and explaining intermolecular forces, as these are the forces that are overcome during melting and boiling.

  This understanding helps you accurately describe the physical properties of substances and is crucial for answering related exam questions.

• Understand Bonding During State Changes

  Remember to remember that during melting or boiling, the covalent bonds within small molecular substances remain intact; only the weak intermolecular forces are overcome. Link your answer to Properties of small molecules in How bonding and structure are related to the properties of substances, and keep the biology specific to covalent bond.

  This understanding helps clarify why small molecular substances can change states without breaking covalent bonds, which is crucial for explaining their physical properties. This keeps revision aligned with the approved learning objective on explain that covalent bonds inside molecules are not broken during melting or boiling.

• Understand Molecular Size Effects

  Remember to when studying melting and boiling points, focus on how molecular size influences these properties. Larger molecules generally have more electrons, leading to stronger intermolecular forces that require more energy to overcome. Link your answer to Properties of small molecules in How bonding and structure are related to the properties of substances, and keep the biology specific to melting point.

  This understanding helps you predict and explain trends in melting and boiling points, which is crucial for exam questions related to the properties of small molecules. This keeps revision aligned with the approved learning objective on explain why larger molecules tend to have higher melting points and boiling points than smaller molecules.

• Understand Conductivity in Small Molecules

  Remember that small molecular substances usually do not conduct electricity because they lack free-moving charged particles.

  This helps you connect the structure of small molecules to their properties, reinforcing the concept that conductivity depends on the presence of mobile charge carriers.

• Understand Intermolecular Forces

  Remember to when studying small molecular substances, focus on the differences between weak intermolecular forces and strong covalent bonds. Use this understanding to explain why these substances have low melting and boiling points. Link your answer to Properties of small molecules in How bonding and structure are related to the properties of substances, and keep the biology specific to intermolecular force.

  This helps clarify the reason behind the physical properties of small molecules, reinforcing the concept that melting and boiling involve overcoming weaker forces rather than breaking covalent bonds. This keeps revision aligned with the approved learning objective on use weak intermolecular forces compared with covalent bonds to explain bulk properties of molecular substances.

• Understand Polymer Structure

  When studying polymers, focus on how their large molecular structure is formed by covalent bonds linking atoms together.

  This understanding helps you explain the properties of polymers and differentiate them from smaller molecules.

• Understand Polymer Structure

  Remember to familiarize yourself with diagrams of polymers, focusing on the repeating units and covalent bonds. Link your answer to Polymers in How bonding and structure are related to the properties of substances, and keep the biology specific to polymer.

  Recognizing the structure of polymers helps you identify their properties and differentiate them from other substances. This keeps revision aligned with the approved learning objective on recognise polymers from diagrams showing bonding and structure.