12. Identify the following as a chemical or physical change: Chemical
a. Burning paper
b. Forming new compounds
C. Baking a cake
d. Acid rain reacting with rocks
e. Change in size
f. Change in color Chemical
8. Slicing bread
h. Change in size but not the substance
1. Producing heat
Water rushing over rocks
k. Tearing paper

Bridget is in science class. her teacher gives her two unknown substances and asks her to determine their relative ph. she places a piece of red litmus paper into both substances. the litmus paper turns purple when she places it into substance i. the litmus paper turns blue when she places it into substance ii. a. substance i is a neutral substance and substance ii is an acid. b. substance i is a neutral substance and substance ii is a base. c. substance i is an acid and substance ii is a base. d. substance i is a base and substance ii is a neutral substance.