ashley_brk Posted July 17, 2013 Share Posted July 17, 2013 (edited) 1- 1) Iron metal is magnetic. 2) Copper conducts electricity. 3) The mass of the NaCl sample is 30 grams. 4) Gold is nonflammable 5)Diamond is a very hard substance. I should identify the following properties physical or chemical but I could not decide 2- - Formation of snow - cooking - condensation of rain - nuclear fission - photosynthesis which ones are exothermic reactions and do their temperature rises/falls? Edited July 17, 2013 by ashley_brk Link to comment Share on other sites More sharing options...
EdEarl Posted July 17, 2013 Share Posted July 17, 2013 We do not do homework, but will help. Read the definition of chemical reaction in wikipedia, at least guess at which are which, and someone will help you. Do the same for exothermic reactions. Link to comment Share on other sites More sharing options...
Parshotam Posted July 28, 2013 Share Posted July 28, 2013 chemical change is the process it means substance lose their previous properties and new substance is formed with perticuticlar properties. Link to comment Share on other sites More sharing options...
Ayesha Posted July 30, 2013 Share Posted July 30, 2013 Remember! a chemical change produces a new substance while a physical change does not produce a new substance.Now think on the examples which you are asking..I hope it will help you. Link to comment Share on other sites More sharing options...
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