Worksheet titled "Exothermic vs Endothermic Reactions Worksheet" with handwritten corrections indicating which processes are exothermic (Exo) or endothermic (Endo), including examples like melting ice, cooking an egg, and burning a match.

The worksheet asks to classify each process as exothermic (Exo) or endothermic (Endo) based on whether energy (usually heat) is released *by* the system (exo) or absorbed *by* the system (endo).

Let’s go through each row carefully and verify the correct classification using the explanation given:

1. Ice cube melts
- System: ice cube
- Explanation: heat is transferred *from* ice cube *to* table → This is incorrect physics! Actually, when ice melts, it *absorbs* heat from the surroundings (e.g., table/air), so the ice cube (system) gains energy. So it should be Endo, not Exo. The current mark (× in Exo) suggests they marked it wrong — but the correct answer is Endo.

2. Cooking an egg in a frying pan
- System: egg
- Explanation: egg absorbs energy from pan → Yes, heat flows into egg → Endo ✔ (marked correctly with × in Exo, meaning Exo is wrong; Endo is correct)

3. Burning a match
- System: match
- Explanation: match releases heat and lights fire → Energy leaves system → Exo ✔ (marked correctly with × in Endo)

4. Human body using energy from food digestion
- System: food
- Explanation: body releases energy to digest food → Wait — careful! In thermodynamics, the *system* is what we’re focusing on. If the system is “food”, then during digestion, food is broken down and *releases* energy (chemical energy → heat + work), so food (system) loses energy → Exo. The current mark (× in Exo) suggests they think it's not exothermic — but it *is* exothermic. So the × is incorrect; it should be Exo.

But wait — sometimes people define the *body* as the system, not the food. The worksheet says “System: food”, so we stick with that. Food undergoing digestion releases energy → exothermic.

5. Morning dew forming on grass & plants
- System: dew (water vapor → liquid)
- Explanation: condensation occurs because heat is released → Yes, gas → liquid releases heat → Exo ✔ (marked correctly: × in Endo)

6. Dynamite explodes
- System: dynamite
- Explanation: energy inside dynamite is released → explosive decomposition releases huge heat/gas → Exo ✔ (marked correctly: × in Endo)

7. Making ice cubes
- System: water
- Explanation: heat is released from water → liquid → solid (freezing) releases heat → Exo ✔ (marked: × in Endo → correct, Endo is wrong)

8. A puddle of water evaporates
- System: water
- Explanation: water absorbs energy to increase temperature → actually, evaporation happens even at constant temp; water absorbs latent heat to change phase (liquid → gas) → Endo ✔ (marked: × in Exo → correct)

9. Plants making sugar through photosynthesis
- System: plant
- Explanation: plant absorbs sun’s energy to produce sugar → requires energy input → Endo ✔ (marked: × in Exo → correct)

10. Nuclear fission
- System: nuclear reactor (or nucleus)
- Explanation: energy inside nucleus is released → yes, fission releases massive energy → Exo ✔ (marked: × in Endo → correct)

11. Converting frost to water vapor (sublimation)
- System: frost (solid)
- Explanation: frost absorbs energy to go from solid → vapor → Endo ✔ (marked: × in Exo → correct)

12. Melting solid sugar cubes
- System: sugar cube
- Explanation: heat is transferred from sugar cube to surroundings? No — melting requires heat *input*, so sugar cube absorbs heat → Endo ✔ (marked: × in Exo → correct)

Now, the only rows where the marking seems *incorrect* based on standard science are:
- #1: Ice melting → should be Endo, but worksheet has × in Exo (i.e., they rejected Exo), which is correct — so actually it’s marked right! Because × in Exo means “not exothermic”, so Endo is intended. So #1 is correct as marked.
- #4: System = food, digestion → food breaks down and releases energy → exothermic. Worksheet has × in Exo, meaning they marked Exo as wrong → that would be *incorrect*. So #4 is likely misclassified.

But the task is not to correct the worksheet — the user just uploaded it and said “Solve the problem accurately.” Since no specific question is stated (e.g., “Which ones are mislabeled?”), and the worksheet appears to be a completed assignment with red × marks indicating student answers, the most reasonable interpretation is:

> The student was asked to fill in “Exo” or “Endo” for each process, and the red × shows where they marked the *wrong* column (i.e., if × is in “Exo”, they incorrectly chose Exo, so correct answer is Endo, and vice versa).

So to “solve the problem”, we need to list the correct classification for each of the 12 items.

Let’s compile the correct answer for each:

1. Ice melts → Endo
2. Cooking egg → Endo
3. Burning match → Exo
4. Food digestion (system = food) → Exo
5. Dew forms (condensation) → Exo
6. Dynamite explodes → Exo
7. Making ice cubes (freezing) → Exo
8. Puddle evaporates → Endo
9. Photosynthesis → Endo
10. Nuclear fission → Exo
11. Frost → vapor (sublimation) → Endo
12. Melting sugar cubes → Endo

That’s the full correct list.

Since the instruction says: “Solve the problem accurately” and the format requires only the Final Answer (after reasoning), and no specific output format was requested beyond that, and given this is a classification task, the expected final answer is likely the list of correct classifications.

But the user didn’t specify *what* to output — however, in context of homework help, and given the worksheet structure, the most useful final answer is to state the correct choice (Exo or Endo) for each numbered item.

We’ll output a clean list.

Final Answer:
1. Endo
2. Endo
3. Exo
4. Exo
5. Exo
6. Exo
7. Exo
8. Endo
9. Endo
10. Exo
11. Endo
12. Endo