Science worksheet designed to help students distinguish between physical and chemical properties through matching and identification exercises.

Problem Analysis and Solution

The provided worksheet focuses on distinguishing between physical properties and chemical properties, as well as matching substances with their respective properties. Below is a detailed solution for each section.

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Section 1: Physical vs. Chemical Properties

#### Instructions:
- Write "C" for chemical property or "P" for physical property.

#### Solutions:
1. a) copper bends easily
- Physical Property (P): Bending is a change in shape without altering the chemical composition of copper.

2. b) iron rusts in the air
- Chemical Property (C): Rusting involves a chemical reaction between iron, oxygen, and water to form iron oxide.

3. c) water is liquid
- Physical Property (P): Being liquid refers to the state of matter, which is a physical characteristic.

4. d) helium gas does not burn
- Chemical Property (C): The inability to burn is related to helium's chemical inertness.

5. e) gold can be easily melted
- Physical Property (P): Melting point is a physical property that describes the temperature at which a substance changes from solid to liquid.

6. f) glass breaks when hit
- Physical Property (P): Breaking is a physical change in the structure of glass.

7. g) water freezes
- Physical Property (P): Freezing is a phase change from liquid to solid, which is a physical process.

8. h) milk turns sour if left out of the fridge
- Chemical Property (C): Turning sour involves bacterial fermentation, which is a chemical reaction.

9. i) water evaporates
- Physical Property (P): Evaporation is a phase change from liquid to gas, which is a physical process.

10. j) hydrogen gas burns explosively
- Chemical Property (C): Burning is a chemical reaction involving hydrogen and oxygen.

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Section 3: Match the Correct Property with the Substance

#### Instructions:
- Match the property with the substance that displays that property.

#### Solutions:
1. I. high lustre
- Substance: H. chrome (like a water tap)
- Chrome has a shiny, reflective surface, indicating high lustre.

2. II. liquid
- Substance: D. vinegar
- Vinegar is a liquid at room temperature.

3. III. thick
- Substance: F. molasses
- Molasses is a thick, syrupy liquid.

4. IV. ductile
- Substance: G. aluminum
- Aluminum can be drawn into wires, indicating ductility.

5. V. translucent
- Substance: C. frosted glass
- Frosted glass allows light to pass through but not clear images, making it translucent.

6. VI. crystalline
- Substance: I. salt
- Salt (sodium chloride) forms crystals.

7. VII. sweet
- Substance: J. sugar
- Sugar has a sweet taste.

8. VIII. choking
- Substance: K. oxygen
- Lack of oxygen can cause choking.

9. IX. silky
- Substance: B. talcum powder
- Talcum powder has a silky texture.

10. X. malleable
- Substance: A. copper
- Copper can be hammered into thin sheets, indicating malleability.

11. XI. gas
- Substance: K. oxygen
- Oxygen is a gas at room temperature.

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Section 4: Write the Letter Corresponding to the Physical Property

#### Instructions:
- Write the letter that corresponds to the physical property described.

#### Solutions:
1. I. shatters when hit
- Property: J. brittleness
- Shattering indicates a lack of flexibility or toughness.

2. II. has a strong smell
- Property: D. odour
- Smell is a sensory property related to odor.

3. III. is silvery and shiny
- Property: F. lustre
- Silvery and shiny describe the reflective quality of a material.

4. IV. you can see through it
- Property: E. clarity
- Seeing through a material indicates transparency or clarity.

5. V. feels rough and gritty
- Property: H. texture
- Roughness and grittiness describe the tactile sensation of a material.

6. VI. has an irregular shape
- Property: G. form
- Shape is a physical characteristic of a material.

7. VII. solid
- Property: B. state
- Solid is one of the states of matter.

8. VIII. thick like syrup
- Property: M. viscosity
- Thickness in liquids is related to viscosity.

9. IX. can be drawn into a wire
- Property: L. ductility
- Drawing into a wire indicates ductility.

10. X. diamonds cannot be scratched
- Property: I. hardness
- Hardness refers to a material's resistance to scratching.

11. XI. can be hammered into a foil
- Property: K. malleability
- Hammering into a foil indicates malleability.

12. XII. sour lemons
- Property: A. taste
- Sourness is a taste sensation.

13. XIII. yellow ruler
- Property: C. colour
- Yellow is a visual property related to color.

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Final Answer

1. Section 1:
- a) P
- b) C
- c) P
- d) C
- e) P
- f) P
- g) P
- h) C
- i) P
- j) C

2. Section 3:
- I. H
- II. D
- III. F
- IV. G
- V. C
- VI. I
- VII. J
- VIII. K
- IX. B
- X. A
- XI. K

3. Section 4:
- I. J
- II. D
- III. F
- IV. E
- V. H
- VI. G
- VII. B
- VIII. M
- IX. L
- X. I
- XI. K
- XII. A
- XIII. C

Boxed Final Answer:
\[
\boxed{
\text{See detailed solutions above.}
}
\]