Question

has a chemical reaction taken place? two liquids are mixed together and bubbles start forming on the side of the beaker. yes, because two things are mixed together. no, because a gas forming does not indicate a chemical reaction. no, because there is no color change. yes, because a gas has started to form. question 4 a classmate is stating that there is enough energy in a system to have a chemical reaction happen. what could be the reason a chemical reaction is not happening? the products are not colliding at the correct orientation.

Explanation:

One of the signs of a chemical reaction is the formation of a gas. Bubbles forming indicate gas formation, so a chemical reaction has occurred in the first - part. For the second - part, for a chemical reaction to occur, reactant molecules must collide with sufficient energy and the correct orientation. Even if there is enough energy, if the orientation is wrong, the reaction won't happen.

Answer:

For the first question: Yes, because a gas has started to form.
For the second question: The products are not colliding at the correct orientation.