Chemistry Unit 1 0.0 / 5 ? ScienceChemistryGCSEOCR Created by: CaraB123Created on: 19-05-16 16:51 Why is it important to control atmospheric pollution? Because of the effect it can have on poeples health and the natural and built environment 1 of 35 What does sulfur dioxide in the atmosphere cause? Acid rain 2 of 35 What damage does acid rain do? It destoys habitats and damages limestone buildings 3 of 35 What reaction takes place in a catalytic coverter? One between nitric oxide and carbon monoxide 4 of 35 Where on the catalytic converter does the reaction take place? On the surface 5 of 35 What is the symbol for propane? C3H8 6 of 35 What is the symbol for propanol? C3H7OH 7 of 35 What do bromine and alkene form by an addition reaction? A new compound 8 of 35 What is the name of the compund formed from bromine and alkene? A di-bromo compound 9 of 35 Which end of the emulsifier is oil loving? The tail (hydrophobic end) 10 of 35 What is one way of recognising a polymer? The pattern repeats every two carbon atoms 11 of 35 What is the name for the process of the shape changing when proteins are cooked? Denaturing 12 of 35 What is the long molecule made during addition polymeristaion? Poly(ethene) 13 of 35 What is an example of a saturated hydrocarbon? Propane 14 of 35 What is an example of an unsaturated hydrocarbon? Propene 15 of 35 What is the polymer of propene? Poly(propene) 16 of 35 What end of an emulsifier is called the hyrophilic end? The head 17 of 35 Why does the texture of proteins change when cooked? Because the shapes of the protein molecules change permanently 18 of 35 Why are potatoes easier to digest when they are cooked? Because the starch grains sweep up and spread out 19 of 35 What is another reason for the easier digestion of potatoes when cooked? The cell walls break resulting in loss of their rigid structure whcih produces the softer texture 20 of 35 What is bakign soda/powder? A sodium hydrocarbonate 21 of 35 What happens to baking powder when heated? It breaks down (decomposes) to give carbon dioxide 22 of 35 What forms from the decompostion of baking powder? Sodium Carbonate, Carbon Dioxide, Water 23 of 35 What end of an emulsifier is called the hyrophobic end? The tail 24 of 35 Which end of the emulsifier is water loving? The head (hydrophilic end) 25 of 35 What is GORE-TEX made from? PTFE (polytetrafluoroethene) 26 of 35 What happens to PTFE to make it stronger? It gets laminiated onto nylon 27 of 35 What types of polymers do scientists want to develop? Biodegradable ones and ones that dissolve 28 of 35 What are problems with disposing polymers? Fill upo landfill if non-biodegradeable, toxics produced when burnt, buring wastes crude oil, difficult to separate them for recycling 29 of 35 What are atoms in polymers held together by? Strong covalent bonds 30 of 35 What can all properties of plastics be related to? Simple models of their structure 31 of 35 Why can some polymers be stretched easily? Weak intermolecular forces, low melting points, molecules can slide over each other 32 of 35 What are intermolecular forces? Weak forces between molecules, not as strong as covalent bonds 33 of 35 Why can some plastiscs not be stretched? Strong forces (covalent bonds/cross-links) high melting points 34 of 35 What does it mean if plastics have weak intermoleuclar forces? The plastic can be easily stretched 35 of 35
Comments
No comments have yet been made