Question

directions: write a p for physical if the example below is a physical change.
write a c for chemical if the example is a chemical change.

1. a student snaps a pencil into 2 pieces.
2. baking soda is dropped into vinegar and creates carbon dioxide gas.
3. a lady takes a tums for her upset stomach and it neutralizes

the excess acid in her stomach making her stomach ache go away.

1. you slice up an orange into pieces.
2. an ice cube melts into water.
3. a potassium tablet is dropped into water and begins to fizz and

smoke and move around.

1. you accidently burn a piece of bread you were toasting.
2. a dead cat is decomposing on the side of the road after being h
3. the water you are boiling begins to steam.
4. an iron nail is rusting in your garage.

Explanation:

To solve this, we determine if each change is physical (no new substance, just form/state change) or chemical (new substance formed, often with reactions like gas, heat, color change, decomposition, rusting, neutralization).

1. A student snaps a pencil into 2 pieces.

• Step: Physical change (only shape changes, no new substance).
• Answer: P

2. Baking soda + vinegar → CO₂ gas.

• Step: Chemical change (reaction produces new gas, CO₂).
• Answer: C

3. Tums neutralizes stomach acid.

• Step: Chemical change (neutralization reaction, new substances formed).
• Answer: C

4. Slicing an orange into pieces.

• Step: Physical change (only shape/size changes, no new substance).
• Answer: P

5. Ice cube melts into water.

• Step: Physical change (state change: solid → liquid, same substance H₂O).
• Answer: P

6. Potassium tablet + water → fizz, smoke, movement.

• Step: Chemical change (reaction produces gas, new substances).
• Answer: C

7. Burning bread.

• Step: Chemical change (combustion, new substances like ash, CO₂).
• Answer: C

8. Dead cat decomposing.

• Step: Chemical change (decomposition, new substances from organic matter breakdown).
• Answer: C

9. Boiling water → steam.

• Step: Physical change (state change: liquid → gas, same substance H₂O).
• Answer: P

10. Iron nail rusting.

• Step: Chemical change (rust (Fe₂O₃) is a new substance, oxidation reaction).
• Answer: C

Final Answers (each line is question number + answer):

1. P
2. C
3. C
4. P
5. P
6. C
7. C
8. C
9. P
10. C

Answer:

To solve this, we determine if each change is physical (no new substance, just form/state change) or chemical (new substance formed, often with reactions like gas, heat, color change, decomposition, rusting, neutralization).

1. A student snaps a pencil into 2 pieces.

• Step: Physical change (only shape changes, no new substance).
• Answer: P

2. Baking soda + vinegar → CO₂ gas.

• Step: Chemical change (reaction produces new gas, CO₂).
• Answer: C

3. Tums neutralizes stomach acid.

• Step: Chemical change (neutralization reaction, new substances formed).
• Answer: C

4. Slicing an orange into pieces.

• Step: Physical change (only shape/size changes, no new substance).
• Answer: P

5. Ice cube melts into water.

• Step: Physical change (state change: solid → liquid, same substance H₂O).
• Answer: P

6. Potassium tablet + water → fizz, smoke, movement.

• Step: Chemical change (reaction produces gas, new substances).
• Answer: C

7. Burning bread.

• Step: Chemical change (combustion, new substances like ash, CO₂).
• Answer: C

8. Dead cat decomposing.

• Step: Chemical change (decomposition, new substances from organic matter breakdown).
• Answer: C

9. Boiling water → steam.

• Step: Physical change (state change: liquid → gas, same substance H₂O).
• Answer: P

10. Iron nail rusting.

• Step: Chemical change (rust (Fe₂O₃) is a new substance, oxidation reaction).
• Answer: C

Final Answers (each line is question number + answer):

1. P
2. C
3. C
4. P
5. P
6. C
7. C
8. C
9. P
10. C