Science ! 1. which of the following represents a chemical change? mowing of grass sublimation of ice dissolving sugar in water charring of a marshmallow 2. if a physical change has taken place, which of these is most likely true? a permanent change has taken place. the changed substance retains its unique properties. atoms rearrange to form a new substance. the molecular composition of a substance changes.

Hello, The answer for number 1 will be D) Charring of a Marshmallow, because you are burning the marshmallow, when you mix the fire with the Marshmallow you will get the final product, making it a chemical change.

The answer for number 2 is B) The changed substance retains its unique properties. Because when a physical change takes place, only it's form will change, making it's particles, and properties the same.

Hope it helps :)

the backbone of the dna and rna compound is sugar phosphate.

my teacher would say no s