Which of the following is a clue that a chemical change has taken place?
A.)A gas forms when the change takes place.
B.)The substance is smaller than it was before the change took place.
C.)The substance has been shaken up.
D.)The substance looks the same as it did before the change took place.

A, A gas forms when the change takes place.

Explanation:

Not 100% sure!! I just know that the conditions of chemical change are color change, formation of a gas, odor change, or temperature change

they must be certified by the avma. ( a.)

mark me the branliest.

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.