Which of the following is an example of a chemical change?

melting ice cream
burning paper
freezing water
evaporating rubbing alcohol

How many grams of aluminum will there be in 98g of al2o3?

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added

What is the indicator of the number of ions in solution? the amount of conductivity the amount of precipitate the amount of solute added