Investigating physical and chemical changes takes a plan. Which of the following are part of planning? Select all that apply.
A. knowing the results of the investigation
B. listing the materials and tools that are needed
C. filling out a data table with the results
D. writing down the procedure for the investigation
E. making sense of what happened to explain it

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

thats a little if u want the answer just look it up on google thats what i do haha : )

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.