CO2 ; H20- They are the only ones that, on both sides, combined with another element and bonding of atoms
Answer: I believe the correct answer would be A.
Answer:
B) the chemicals are gaining energy from the surroundings.
Explanation:
The positive sign of the energy difference in a chemical reaction would indicate that the chemicals are gaining energy from the surroundings. This is what happens in an endothermic reaction.
In an endothermic reaction, heat is absorbed from the surroundings hence the surrounding becomes colder at the end of the changes.
- Here the energy change is assigned a positive value.
- This is because the heat energy level of the final state is higher than that of the initial state.
- So, the difference gives a positive value.
<span>The elastic potential energy stored in the stretched rubber band changes to kinetic energy.</span>
