For the examples below, explain what a physical change or a chemical change has occurred. justify your answer
a. when you mix baking soda and vinegar, carbon dioxide is released.
b. you build a tall sand castle at the beach. after wave washes it over, the sand castle turns into a big pile of sand
c. boiling water turns a raw egg into a hard boiled egg
d. max divided cookie dough into small pieces on a cookie sheet.
e. a loaf of freshly baked bread tastes better and looks much different than a lump of bread dough
f. a glass of water is left in the sun. in the time, the water evaporates leaving the glass empty.

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

If the specific heat of a metal is 0.850 j/g °c, what is its atomic weight?

Aflask with vinegar in it has a mass of 160 grams. a balloon with baking soda in it has a mass of 40 grams. the balloon is attached to the flask to seal the opening and the vinegar and baking soda mixes. the balloon inflates to a large volume. what will the total mass of the balloon and flask be after the balloon inflates? explain. a) less than 200 grams because the solid baking soda disappears. b) 200 grams, because all the atoms remain in the balloon or flask. c) more than 200 grams because the size of the balloon is so much larger. d) less than 200 grams because gases such as the one in the balloon are lighter than solids and liquids.