CHEMISTRY REVISION 0.0 / 5 ? ChemistryAtoms and compoundsAtomsMetals, metal ores and alloysNanoscienceStructure and bondingGCSEAQA Created by: TJBARBERSCreated on: 20-06-21 19:13 Define Ionic Bonding? Strong forces of attraction between oppositely charged ions. 1 of 9 Why are the particles that make up an metal described as positively charged? Metal atoms lose electrons when they form ions which result in them having positively charged ions. 2 of 9 What are delocalized electrons? Delocalized electrons are the electrons in the ''sea of free moving electrons''. They are free to move. 3 of 9 Define what is meant by the term "Alloy" An alloy is a mixture of two or more elements, at least one of which is a metal. 4 of 9 Why are metals malleable? Because the layers of atoms(or positively charged ions) in a giant metallic structure can slide over each other. 5 of 9 Why are alloys harder than pure metal? Alloys are harder than pure metals because the regular layers in a pure metal are distorted by atoms of different sizes in an alloy. 6 of 9 What do delocalized electrons transfer throughout a metal? They enable electricity and thermal energy to be transferred through the metal. 7 of 9 What is meant by nanoscience? Nanoscience is the study of small particles that are between 1 and 100 nanometers in size. 8 of 9 What properties do nanoparticles have different from those for the same materials in bulk? Nanoparticles have a high surface area to volume ratio, with a high percentage of their atoms exposed at their surface. 9 of 9
Comments
No comments have yet been made