C. A blue liquid and a yellow liquid mix and make a green liquid.
D. Baking soda is mixed with vinegar to make carbon dioxide gas.
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Home » Chemistry » Which of these could be a physical change? A. Wood is burned in a fireplace. B. Cake batter is baked in an oven. C. A blue liquid and a yellow liquid mix and make a green liquid. D. Baking soda is mixed with vinegar to make carbon dioxide gas.