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Which two observations are evidence that a chemical change is happening?

A. A yellow liquid forms as a yellow solid is slowly heated.
I B. Bubbles of gas are released when a solid is combined with a
liquid.
I c. Solid crystals form as the temperature of a liquid is lowered.
D. Light and heat are given off after a spark ignites a substance,

User Soverman
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1 Answer

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B. Bubbles are created whether using heat or not at inception of chemical change
User Tim Klingeleers
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