Which is not proof that a chemical change has occurred? the substance melts the color changes a precipitate forms bubbles are produced

the substance melts

Explanation:

A physical reaction is defined as the reaction in which a change in shape, size takes place. No new substance gets formed in these reactions.

A chemical reaction is defined as the reaction in which a change in chemical composition takes place. A new substance is formed in these reactions.

Characteristics of chemical reaction:

1. Change in color

2. formation of precipitate

3. Energy is lost or absorbed

4. A gas or bubbles are produced

When a substance melts , no new compound gets formed and no change in chemical composition takes place, thus is a physical change.

The type of circuit depicted above is an example of a parallel circuit. Parallel circuits are circuits that have several pathways for current to flow; the easiest way to see this is by drawing a condensed diagram. If one of the bulbs were removed (that particular pathway was opened so electricity couldn’t flow), the current could simply go through another pathway using another lightbulb and the circuit would still be complete. Series circuits only have one pathway that the current can flow through, which this can’t be since it has multiple. The circuit isn’t shorted since the lightbulb reduces the voltage to zero, and the circuit is closed since the lightbulbs are on.

Hope this helps!