Which is an example of a physical change? A)Mixing blue and yellow paint to create green paint
B)Adding water and yeast to bread dough in order to make it raise.
C)Mixing two liquids together in a test tube and the tube becoming warm.
D)Adding a piece of chalk containing calcium carbonate to a glass of mild acid causing the formation of a foam of bubbles.
Eliminate

1) how many electrons are in each energy level of the following elements? a. he b. na c. na d. ne 2) how many valence electrons are percent in the following atoms? a. s b. mg c. be d. cl 3) which of the following elements are stable as atoms? a. he b. o c. cl d. ar if you are able to provide the work as to how you got the answers that would be greatly appreciated. : )

Complete the sentence. the lower the hydrogen ion concentration, the the ph. higher lower closer to 7 closer to 0

2points what is the job of a scientist? a. to answer ethical questions. b. to write laws based on his or her knowledge. c. to ask and answer scientific questions. d. to ignore facts that do not support his or her theory.