1 Go to Phone or Phone Settings and select Calls or Incoming Calls.. 2  Press Blocked Callers, Blacklist, Unwanted Calls, or another similarly named option menu. 3  Your contact list or phone book will appear; choose the name you wish to block, or manually enter the phone number you wish to block.ress the menu button on your phone, then go to Settings.. 1  Go to Phone or Phone Settings and select Calls or Incoming Calls.. 2  Press Blocked Callers, Blacklist, Unwanted Calls, or another similarly named option menu.
An energy profile of an exothermic reaction. by definition the enthalpy change has a negative value: in an exothermic reaction, gives a negative value for Î´H, since a larger value (the energy released in the reaction) is subtracted from a smaller value (the energy used for the reaction). For example, when hydrogen burns:
Best Answer: An exothermic reaction gives off heat, as oppose to an endothermic reaction, which takes in heat. If you put in heat to make the reaction happen, then it is endothermic. If the reaction makes the surroundings hotter, then it is exothermic. E.g. melting ice requires heat, so it is endothermic.