Ineed ! can you tell me about the difference between physical and chemical i have a dba in a few minutes and i don't ! use easy to understand answers 'cause i'm a little under the weather.

Okay physical changes happen when lets say you hit glass with a hammer. The glass broke so its physical not chemical properties. But if you were to melt the glass and add lets say molten steel (obviously you can't do this this is just an example) The glass once it cools will no longer be glass it will be a combination of glass and steel.

Hope this helped!

I’m guessing you’re more alert to yourself or your surroundings if you’re more concentrated

Answer : option c) heat is released during the process.explanation :

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.