Educational worksheet on physical and chemical properties and changes, including definitions and identification exercises.
Worksheet titled "Physical and Chemical Properties and Changes" with sections defining physical and chemical properties and changes, and exercises to identify examples of each.
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Step-by-step solution for: Physical and Chemical Properties and Changes - Studocu
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Step-by-step solution for: Physical and Chemical Properties and Changes - Studocu
You've uploaded a worksheet titled “PHYSICAL AND CHEMICAL PROPERTIES AND CHANGES”, which includes three main sections:
1. Identifying Physical (P) or Chemical (C) Properties
2. Identifying Physical (P) or Chemical (C) Changes
3. Part A: Real-world examples of Physical and Chemical Changes
The worksheet already has answers filled in — it appears to be an answer key.
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✔ Let’s verify and explain each section to ensure correctness and understanding.
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## 🔹 SECTION 1: PHYSICAL vs. CHEMICAL PROPERTIES
- Physical Property: Can be observed or measured *without changing* the substance’s identity (e.g., color, density, melting point).
- Chemical Property: Describes how a substance *reacts or changes into a new substance* (e.g., flammability, reactivity with acid).
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| # | Item | Answer | Explanation |
|---|-----------------------------|--------|-----------|
| 1 | blue color | P | Color is observable without changing matter. |
| 2 | density | P | Mass/volume ratio — measurable without altering substance. |
| 3 | flammability (burns) | C | Burning = chemical reaction → new substances (ash, CO₂, etc.). |
| 4 | solubility (dissolves) | P | Dissolving ≠ chemical change; sugar in water is still sugar. |
| 5 | reacts with acid | C | Reaction produces new substances (e.g., gas, salt). |
| 6 | supports combustion | C | Ability to support burning (like oxygen) involves chemical reactions. |
| 7 | sour taste | P | Taste is sensed physically; doesn’t alter substance. |
| 8 | melting point | P | Temperature at which solid becomes liquid — no new substance. |
| 9 | reacts with water | C | Reaction forms new compounds (e.g., sodium + water → NaOH + H₂). |
|10 | hardness | P | Resistance to scratching — physical characteristic. |
|11 | boiling point | P | Temperature at which liquid becomes gas — phase change only. |
|12 | luster | P | Shine/appearance — observable without altering matter. |
|13 | odor | P | Smell is sensed physically; doesn’t change identity. |
|14 | reacts with air | C | Oxidation (rusting, tarnishing) creates new substances. |
✔️ All answers are correct.
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## 🔹 SECTION 2: PHYSICAL vs. CHEMICAL CHANGES
- Physical Change: No new substance formed — change in shape, size, state (e.g., cutting, melting, dissolving).
- Chemical Change: New substance(s) formed — often with color change, gas production, temperature change, or precipitate.
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| # | Example | Answer | Explanation |
|---|-----------------------------------------|--------|-----------|
| 1 | NaCl dissolves in water | P | Salt ions disperse but remain Na⁺ and Cl⁻ — no new substance. |
| 2 | Ag (Silver) tarnishes | C | Tarnish = silver sulfide (Ag₂S) — new compound formed. |
| 3 | An apple is cut | P | Shape changed, no new substance. |
| 4 | Heat changes H₂O to steam | P | Phase change (liquid → gas), still H₂O. |
| 5 | Baking soda reacts to vinegar | C | Produces CO₂ gas — new substances formed. |
| 6 | Fe (Iron) rusts | C | Rust = iron oxide — new compound. |
| 7 | Alcohol evaporates | P | Liquid → gas — same molecules. |
| 8 | Ice melts | P | Solid → liquid H₂O — no chemical change. |
| 9 | Milk sours | C | Bacteria ferment lactose → lactic acid — new substances. |
|10 | Sugar dissolves in water | P | Sugar molecules remain — just dispersed. |
|11 | Wood rots | C | Decomposition by microbes → new compounds. |
|12 | Pancakes cook | C | Maillard reaction, protein denaturation — irreversible chemical change. |
|13 | Grass grows | C | Photosynthesis and cell growth — complex chemical processes. |
|14 | A tire is inflated | P | Air is compressed — no new substance. |
|15 | Food is digested | C | Enzymes break down food into new molecules (glucose, amino acids). |
|16 | Paper towel absorbs water | P | Capillary action — water trapped, not chemically altered. |
✔️ All answers are correct.
---
## 🔹 PART A: Real-world Examples
> Physical Change (P): Appearance/shape/state changes, *no new substance*.
> Chemical Change (C): *New substance formed* — often with energy change, gas, color, odor.
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| # | Scenario | Answer | Explanation |
|---|--------------------------------------------------|--------|-----------|
| 1 | Ice cube melts → puddle → evaporates | P | Phase changes only — still H₂O. |
| 2 | Two chemicals mixed → gas produced | C | Gas = new substance formed (e.g., CO₂ from baking soda + vinegar). |
| 3 | Bicycle rusts → color change | C | Rust = iron oxide — new substance. |
| 4 | Solid crushed to powder | P | Size/shape change — same material. |
| 5 | Two substances mixed → light produced | C | Light often indicates exothermic chemical reaction (e.g., glow stick). |
| 6 | Ice melts + reacts with sodium | C | Sodium reacts violently with water → hydrogen gas + heat — new substances. |
| 7 | Mixing salt and pepper | P | No reaction — just physical mixture. |
| 8 | Chocolate syrup dissolved in milk | P | Dissolution — no chemical reaction. |
| 9 | Marshmallow toasted over campfire | C | Caramelization/browning — chemical change (Maillard reaction). |
|10 | Marshmallow cut in half | P | Physical division — no new substance. |
✔️ All answers are correct.
---
## 🧠 Summary & Learning Points:
- Physical Properties/Changes: Observable/measurable without altering identity.
- Chemical Properties/Changes: Involve transformation into new substances.
- Clues for Chemical Change:
- Color change
- Gas production
- Odor change
- Temperature change
- Precipitate formation
- Irreversibility (often)
---
✔ Final Verdict: The answer key you uploaded is 100% accurate and well-explained. It correctly distinguishes between physical and chemical properties and changes using clear definitions and real-world examples.
If you’re studying this topic, reviewing these explanations will solidify your understanding! Let me know if you’d like a printable version or quiz based on this worksheet. 😊
1. Identifying Physical (P) or Chemical (C) Properties
2. Identifying Physical (P) or Chemical (C) Changes
3. Part A: Real-world examples of Physical and Chemical Changes
The worksheet already has answers filled in — it appears to be an answer key.
---
✔ Let’s verify and explain each section to ensure correctness and understanding.
---
## 🔹 SECTION 1: PHYSICAL vs. CHEMICAL PROPERTIES
Definitions:
- Physical Property: Can be observed or measured *without changing* the substance’s identity (e.g., color, density, melting point).
- Chemical Property: Describes how a substance *reacts or changes into a new substance* (e.g., flammability, reactivity with acid).
---
✔ Answers & Explanations:
| # | Item | Answer | Explanation |
|---|-----------------------------|--------|-----------|
| 1 | blue color | P | Color is observable without changing matter. |
| 2 | density | P | Mass/volume ratio — measurable without altering substance. |
| 3 | flammability (burns) | C | Burning = chemical reaction → new substances (ash, CO₂, etc.). |
| 4 | solubility (dissolves) | P | Dissolving ≠ chemical change; sugar in water is still sugar. |
| 5 | reacts with acid | C | Reaction produces new substances (e.g., gas, salt). |
| 6 | supports combustion | C | Ability to support burning (like oxygen) involves chemical reactions. |
| 7 | sour taste | P | Taste is sensed physically; doesn’t alter substance. |
| 8 | melting point | P | Temperature at which solid becomes liquid — no new substance. |
| 9 | reacts with water | C | Reaction forms new compounds (e.g., sodium + water → NaOH + H₂). |
|10 | hardness | P | Resistance to scratching — physical characteristic. |
|11 | boiling point | P | Temperature at which liquid becomes gas — phase change only. |
|12 | luster | P | Shine/appearance — observable without altering matter. |
|13 | odor | P | Smell is sensed physically; doesn’t change identity. |
|14 | reacts with air | C | Oxidation (rusting, tarnishing) creates new substances. |
✔️ All answers are correct.
---
## 🔹 SECTION 2: PHYSICAL vs. CHEMICAL CHANGES
Definitions:
- Physical Change: No new substance formed — change in shape, size, state (e.g., cutting, melting, dissolving).
- Chemical Change: New substance(s) formed — often with color change, gas production, temperature change, or precipitate.
---
✔ Answers & Explanations:
| # | Example | Answer | Explanation |
|---|-----------------------------------------|--------|-----------|
| 1 | NaCl dissolves in water | P | Salt ions disperse but remain Na⁺ and Cl⁻ — no new substance. |
| 2 | Ag (Silver) tarnishes | C | Tarnish = silver sulfide (Ag₂S) — new compound formed. |
| 3 | An apple is cut | P | Shape changed, no new substance. |
| 4 | Heat changes H₂O to steam | P | Phase change (liquid → gas), still H₂O. |
| 5 | Baking soda reacts to vinegar | C | Produces CO₂ gas — new substances formed. |
| 6 | Fe (Iron) rusts | C | Rust = iron oxide — new compound. |
| 7 | Alcohol evaporates | P | Liquid → gas — same molecules. |
| 8 | Ice melts | P | Solid → liquid H₂O — no chemical change. |
| 9 | Milk sours | C | Bacteria ferment lactose → lactic acid — new substances. |
|10 | Sugar dissolves in water | P | Sugar molecules remain — just dispersed. |
|11 | Wood rots | C | Decomposition by microbes → new compounds. |
|12 | Pancakes cook | C | Maillard reaction, protein denaturation — irreversible chemical change. |
|13 | Grass grows | C | Photosynthesis and cell growth — complex chemical processes. |
|14 | A tire is inflated | P | Air is compressed — no new substance. |
|15 | Food is digested | C | Enzymes break down food into new molecules (glucose, amino acids). |
|16 | Paper towel absorbs water | P | Capillary action — water trapped, not chemically altered. |
✔️ All answers are correct.
---
## 🔹 PART A: Real-world Examples
Key:
> Physical Change (P): Appearance/shape/state changes, *no new substance*.
> Chemical Change (C): *New substance formed* — often with energy change, gas, color, odor.
---
✔ Answers & Explanations:
| # | Scenario | Answer | Explanation |
|---|--------------------------------------------------|--------|-----------|
| 1 | Ice cube melts → puddle → evaporates | P | Phase changes only — still H₂O. |
| 2 | Two chemicals mixed → gas produced | C | Gas = new substance formed (e.g., CO₂ from baking soda + vinegar). |
| 3 | Bicycle rusts → color change | C | Rust = iron oxide — new substance. |
| 4 | Solid crushed to powder | P | Size/shape change — same material. |
| 5 | Two substances mixed → light produced | C | Light often indicates exothermic chemical reaction (e.g., glow stick). |
| 6 | Ice melts + reacts with sodium | C | Sodium reacts violently with water → hydrogen gas + heat — new substances. |
| 7 | Mixing salt and pepper | P | No reaction — just physical mixture. |
| 8 | Chocolate syrup dissolved in milk | P | Dissolution — no chemical reaction. |
| 9 | Marshmallow toasted over campfire | C | Caramelization/browning — chemical change (Maillard reaction). |
|10 | Marshmallow cut in half | P | Physical division — no new substance. |
✔️ All answers are correct.
---
## 🧠 Summary & Learning Points:
- Physical Properties/Changes: Observable/measurable without altering identity.
- Chemical Properties/Changes: Involve transformation into new substances.
- Clues for Chemical Change:
- Color change
- Gas production
- Odor change
- Temperature change
- Precipitate formation
- Irreversibility (often)
---
✔ Final Verdict: The answer key you uploaded is 100% accurate and well-explained. It correctly distinguishes between physical and chemical properties and changes using clear definitions and real-world examples.
If you’re studying this topic, reviewing these explanations will solidify your understanding! Let me know if you’d like a printable version or quiz based on this worksheet. 😊
Parent Tip: Review the logic above to help your child master the concept of physical and chemical properties worksheet physical science a.
