Atomic Structure and Bonding 2.0 / 5 based on 1 rating ? ChemistryStructure and bondingGCSEAQA Created by: Emily1Created on: 20-06-13 20:08 Why do ionic compounds have high melting and boiling points? Ionic compounds have high melting and boiling points because there are strong bonds between their ions. 1 of 8 In what physical state or states do ionic substances conduct electricity? liquid or dissolved in water 2 of 8 When a substance with a simple molecular structure boils, which bonds are broken? When a molecular substance boils, the bonds broken are intermolecular bonds. 3 of 8 Name a statements that is true of substances with a simple molecular structure? Substances with a simple molecular structure have low melting points and do not conduct electricity. 4 of 8 Why are metals good conductors of electricity? .Metals are good conductors of electricity because they contain electrons that are free to move. 5 of 8 What is the approximate size of a typical nanoparticle? 50 nm 6 of 8 How many nanometres are there in a metre? There are one billion nanometres in a metre. 7 of 8 Why are titanium dioxide nanoparticles used in sunblock creams? They block ultraviolet light but do not reflect visible light. 8 of 8
Comments
No comments have yet been made