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MissPhiladelphia
I think the correct answer from the choices listed above is the last option. The  least reliable indicator of a chemical change would be a change in shape. It does not indicate that a reaction happened. It can be that  the substance was cut or crushed only. Hope this answers the question.

1: a chemical change

2: the components of the pure substance will not be able to be separated by physical means

3: true

4: false

5:change of shape

6:a chemical change

7: false

8:false

9:solid

10: It reacts with hydrogen to form a gas.

11:false

12: false

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