Question

Which is evidence that a chemical reaction has occurred?

es
A)
a phase change occurs
B)
a new gas is observed in the form of bubbles
red and yellow paint mixing to make orange paint
D)
the temperature of the substance remains constant

The correct answer is B) a new gas is observed in the form of bubbles .

Answer 1

B. a new gas is observed in the form of bubbles

red and yellow paint mixing to make orange paint.