Question

1. if energy in the system (reactants) decreases, where does the energy go?
2. what type of change is it when energy is released?
3. if energy in the system increases, from where is the energy whabsorbed?
4. what type of change is it when energy is absorbed?
5. label the reaction processes in the image below.
6. what type of reaction is it when the radiant energy from the sun is changed to chemical energy in glucose molecules?
7. what type of reaction is it when animals obtain chemical energy in the form of glucose?

Explanation:

Step1: Answer question 10

According to the law of conservation of energy, when the energy in the system (reactants) decreases, the energy is transferred to the surroundings.

Step2: Answer question 11

When energy is released, it is an exothermic change. Heat is given off from the system to the surroundings.

Step3: Answer question 12

If the energy in the system increases, the energy is absorbed from the surroundings.

Step4: Answer question 13

When energy is absorbed, it is an endothermic change. Heat is taken in by the system from the surroundings.

Step5: Answer question 14

In the left - hand side of the image where energy of the system decreases, it is exothermic. In the right - hand side of the image where energy of the system increases, it is endothermic.

Step6: Answer question 15

The conversion of radiant energy from the Sun to chemical energy in glucose molecules is an endothermic reaction (photosynthesis), as it requires the input of energy (sunlight) to form chemical bonds in glucose.

Step7: Answer question 16

When animals obtain chemical energy in the form of glucose, they break down glucose through cellular respiration, which is an exothermic reaction as energy is released.

Answer:

1. The energy is transferred to the surroundings.
2. Exothermic change.
3. The energy is absorbed from the surroundings.
4. Endothermic change.
5. Left: exothermic; Right: endothermic.
6. Endothermic reaction.
7. Exothermic reaction.