Question
7 Fillin the blank: Chemical change occurs when two or more molecules swap alor
molecules with new properties
8) Fill in the blank: A
does not change the substance into anything new.
9) List 6 signs that a chemical change (reaction) has occurred:
10) List 3 examples of a physical change
Answer
7) atoms
8) physical change
9) Change in color, production of gas, production of heat, formation of a precipitate, change in odor, change in state (solid, liquid, gas)
10) Melting, freezing, evaporating.