Metallic bonding is the electrostatic force of attraction between ____ charged ions and ____ electrons. Metallic elements are ____ of electricity because they contain delocalised electrons. metal + oxygen —> ____ metal + water —> ____ + H2 metal + dilute acid —> ____ + hydrogen Metals can be arranged in order of ____ by comparing the rates at which they react. ____ is at the top of the reactivity series, ____ is at the bottom. Reduction is a ____ of electrons by a reactant in any reaction. Oxidation is a ____ of electrons by a reactant in any reaction. In a ____ reaction, reduction and oxidation take place at the same time. During the extraction of metals, metal ions are ____ forming metal ____. The method used to extract a metal from its ore depends on the position of the metal in the ____. Extraction of metals Methods used are: ____ (for extraction of Ag, Au and Hg), heating ____ (for extraction of Cu, Pb, Sn, Fe and Zn) or ____ (for extraction of more reactive metals including aluminium) Electrolysis is the decomposition of an ionic compound into its elements using electricity. A ____ supply must be used if the products of electrolysis are to be ____. Positive ions gain electrons at the ____ electrode and negative ions lose electrons at the ____ electrode. A simple electrochemical cell can be made by placing two ____ in an ____. We call this a ____. Electrically conducting solutions containing ____ are known as electrolytes. Another type of cell can be made using two ____ An ____ can be used to link the half-cells of an electrochemical cell. ____ can move across the bridge to complete an electrical circuit. Electrons move through the ____. A graphite rod can be used as the electrode in such half-cells. Different pairs of metals produce different ____. These voltages can be used to arrange the elements into an ____ series. The further ____ elements are in the electrochemical series, the greater the voltage produced when they are used to make an electrochemical cell. Electrons flow in the circuit from the species ____ in the electrochemical series to the one ____ in the electrochemical series. Plastics are examples of materials known as ____. Polymers are ____ chain molecules formed by joining together a large number of small molecules called ____. Growing plants require ____, including compounds containing nitrogen, ____ or potassium. Fertilisers are substances which restore elements, ____ for healthy plant growth, to the soil. Ammonia and nitric acid are important compounds used to produce ____, nitrogen- containing salts that can be used as fertilisers. Ammonia is a pungent, clear, colourless gas which dissolves in water to produce an ____ solution. Ammonia solutions react with acids to form soluble salts. ammonia + acid —> ammonium salt + H2O The ____ process is used to produce the ammonia required for fertiliser production. N2 (g) + 3H2 (g) —> 2NH3 (g) At ____temperatures the forward reaction is too slow to be economical. If the temperature is ____, the rate of reaction increases but, as the temperature increases, the backward reaction becomes more dominant. An ____ catalyst is used to increase reaction rate. Ammonia is the starting material for the commercial production of ____ The ____ process uses ammonia, oxygen and water to produce nitric acid. A ____ catalyst is used in this process. Radioactive decay involves changes in the ____ of atoms. Unstable nuclei (radioisotopes) can become more ____ nuclei by giving out ____, beta or gamma radiation. Alpha particles (α) consist of two ____ and two neutrons and carry a double ____ charge. They have a range of only a few centimetres in air and are stopped by a ____. Alpha particles will be attracted towards a ____ charged plate. Beta particles (β) are ____ ejected from the ____ of an atom. They are able to travel over a metre in air but can be stopped by a thin sheet of ____. Beta particles will be attracted towards a ____ charged plate. Gamma rays (γ) are ____ emitted from within the ____ of an atom. They are able to travel great distances in air. They can be stopped by barriers made of materials such as ____. Gamma rays are ____ deflected by an electric field. Half-life is the time for half of the nuclei of a particular isotope to ____. The half-life of an isotope is a ____, unaffected by chemical or physical conditions. Radioactive isotopes can be used to ____ materials. Radioisotopes have a range of uses in medicine and in industry. isotopes used inside the body should have a ____ half life to minimise damage to ____. Isotopes used in industry should have a ____ half life so that they do not need to be ____ often. The choice of isotopes should reflect the material it needs to pass through. ____ radiation is useful in smoke detectors because they are ____ absorbed by smoke particles The choice of isotopes should reflect the material it needs to pass through. ____ radiation is useful in tracers detectors because it can pass through bone and tissue.
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national 5 chemistry - unit 3
શેર કરો
Gw14cannonlynda
દ્વારા
Chemistry
સામગ્રીમાં ફેરફાર કરો
પ્રિન્ટ
એમ્બેડ
વધુ
સોંપણીઓ
લીડરબોર્ડ
વધુ બતાવો
ઓછું બતાવો
આ લીડરબોર્ડ હાલમાં ખાનગી છે. તેને સાર્વજનિક કરવા માટે
શેર
પર ક્લિક કરો.
આ લીડરબોર્ડને સ્ત્રોત નિર્માતા દ્વારા નિષ્ક્રિય કરવામાં આવ્યું છે.
આ લીડરબોર્ડ નિષ્ક્રિય છે કારણ કે તમારા વિકલ્પો સ્ત્રોત નિર્માતા કરતા અલગ છે.
વિકલ્પો પાછા લાવો
વાક્ય પૂર્ણ કરો
એ ઓપન-એન્ડેડ ટેમ્પલેટ છે. તે લીડરબોર્ડ માટે સ્કોર જનરેટ કરતું નથી.
લોગ-ઇન જરૂરી છે
દૃશ્યમાન શૈલી
ફોન્ટ્સ
સબસ્ક્રિપ્શન જરૂરી
વિકલ્પો
ટેમ્પલેટ બદલો
બધું બતાવો
પ્રવૃત્તિ રમત દરમ્યાન વધુ ફોરમેટ દેખાશે.
પરિણામો ખોલો
કડીની નકલ કરો
ક્યુઆર કોડ
કાઢી નાંખો
આપોઆપ સંગ્રહ થયેલ છે:
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