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 information of a foam of bubbles.
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Which is an example of a physical change?
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