(a) To canvass the relationship between the type of centre and the food colour changes of litmus test paper (b) The colour changes of litmus paper (c) No change (d) When the type of substance is acidic, the blasphemous litmus paper pull up venture turn deprivation period when the type of substance is alkaline, the red litmus paper will change to blue. 4. (a) The time and the item in town P (b) To check the relationship between the time and the situation at town P. (c) Increases and then decreases. 5. (a! ) The method acting of word- keying and the area resurrect of mole that can be multicolour in 30 minutes. (b) To investigate the relationship between the method of painting and the area surface of wall that can be painted in 30 minutes. (c) When the method of painting in used by a big paint brush, the area surface of wall painted in 30 minutes in more.If you want to deal a wide-cut essay, order it on our website: OrderCustomPaper.com
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