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

Exam tips

• Understand Metal Softness

  Remember to remember that pure metals have atoms arranged in regular layers, which can slide over each other, making them soft. Link your answer to Properties of metals and alloys in How bonding and structure are related to the properties of substances, and keep the biology specific to metal.

  This understanding helps explain why pure metals may not be suitable for applications requiring strength and durability. This keeps revision aligned with the approved learning objective on explain why pure metals may be too soft for some uses.

• Understand Alloy Hardness

  Remember to remember that alloys are harder than pure metals due to the distortion of atom layers, which prevents them from sliding easily. Link your answer to Properties of metals and alloys in How bonding and structure are related to the properties of substances, and keep the biology specific to metal.

  This understanding helps explain why alloys are often used in applications requiring strength and durability. This keeps revision aligned with the approved learning objective on explain why alloys are harder than pure metals using distortion of atom layers.

• Understand Delocalised Electrons

  Focus on how delocalised electrons act as mobile charge carriers in metals to explain their conductivity.

  This understanding is crucial for answering questions about electrical conductivity in metals and differentiating it from ionic conductivity.

• Understand Delocalised Electrons

  Remember to focus on how delocalised electrons in metals allow for efficient thermal energy conduction. Link your answer to Metals as conductors in How bonding and structure are related to the properties of substances, and keep the biology specific to delocalised electron.

  This understanding helps explain why metals are good conductors and can lead to clearer answers in exam questions about thermal properties. This keeps revision aligned with the approved learning objective on explain why metals conduct thermal energy using delocalised electrons.

• Understand Conductivity Differences

  Remember to when studying conductivity, clearly distinguish between the role of delocalised electrons in metals and mobile ions in ionic compounds. Link your answer to Metals as conductors in How bonding and structure are related to the properties of substances, and keep the biology specific to distinguish.

  This helps you accurately explain and compare how each type of substance conducts electricity, which is crucial for exam questions. This keeps revision aligned with the approved learning objective on distinguish metallic conductivity from ionic conductivity in terms of the particles that move.