nooo 0.0 / 5 ? ChinesenioGCSEAQA Created by: katrinamcmahonCreated on: 06-03-17 19:11 Why don't simple molecules conduct electricity? Because they don't have a charge. 1 of 15 What is the name for a regular arrangement of atoms? A lattice. 2 of 15 List properties properties of metals? Can be bent and shaped, conduct heat and electricity, high melting point, shiny. 3 of 15 Why do metals have melting and boiling points? Because they have strong electrostatic bonds that need a lot of energy to break. 4 of 15 What does metallic bonding happen between? metals. 5 of 15 What happens in metallic bonding? Electrons are delocalised. 6 of 15 What is a molecule? Small group of atoms joined by covalent bonds. 7 of 15 Why are most metals dense? Because there is not much space between their closely packed layers. 8 of 15 What can you change to make polymers with different structures? Temperature and pressure. 9 of 15 What does LDPE and HDPE stand for ? Low density poly(ethene) and high density poly(ethene). 10 of 15 What are LDPE and HDPE made from? Poly(ethene). 11 of 15 What does LDPE need to react? High temperature and low pressure. 12 of 15 What does HDPE need to react? Low temperature and high pressure. 13 of 15 Name an example of something made from LDPE and explain why it is. Clingfilm, because it is flexible and soft. 14 of 15 Name an example of something made from HDPE and explain why it is. Bottle tops, because they are stiff and hard. 15 of 15
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