Question

An energy change may be indicated by:

a) an increase in temperature.
b) sparks.
c) a chemical change.
d) a glow or flames.

Answer 1

An energy change may be indicated by an increase in temperature, sparks, or a glow or flames. These specific observations help to indicate that a chemical change has occurred.

Step-by-step explanation:

An energy change may be indicated by:

1. An increase in temperature: In a chemical reaction, the release or absorption of heat can indicate an energy change.
2. Sparks: Sparks can indicate the release of energy in a chemical reaction, such as in the ignition of a firework.
3. A glow or flames: The presence of a glow or flames indicates the release of energy in the form of light and heat, as seen in a burning candle.

These specific observations help to indicate that a chemical change has occurred.