Question

7
when substances go through chemical changes, which of the following will always happen?
a. one or more substances will be completely destroyed.
b. exactly one new substance will form and one will be destroyed.
c. one or more substances with different chemical properties will form.
d. a gas will form or a white solid will precipitate.

Explanation:

A chemical change involves the formation of new substances with distinct chemical properties. Matter is conserved (not destroyed, ruling out A/B). Observations like gas/precipitate (D) are common but not universal. Only option C describes a defining feature of chemical changes.

Answer:

C. One or more substances with different chemical properties will form.