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8  Oliver investigates what happens to materials when they are heated.

               Here are his results.


                      material            before heating                     after heating



                          A                  silver solid                     white solid




                          B                 green solid                       black solid





                          C               colourless liquid                       gas





                          D                  white solid                      white solid




                          E                  white solid                   colourless liquid



               (a) Which material does not change when Oliver heats it?

                                                                                                           [1]



               (b) Which material boils when Oliver heats it?

                                                                                                           [1]


               (c) Which material melts when Oliver heats it?


                                                                                                           [1]





















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