Which is the least reliable indicator of a chemical change?

change of color

change of odor

formation of gases

change of shape

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.

Read the sentences below in 1962, i tried to enroll as the first black student at the university of mississippi. the governor of mississippi blocked my entrance which best describes the verbs used in the sentences? o they are past tense verbs, which are often used in narrative essays o they are past tense verbs, which are not often used in narrative essays. o they are future tense verbs, which are often used in narrative essays o they are future tense verbs, which are not often used in narrative essays.