This worksheet helps students practice identifying physical versus chemical properties through fill-in-the-blank and matching questions.

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 glass is a physical change in its structure without altering its chemical composition.

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, demonstrating 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: B. talcum powder
- Talcum powder can cause choking if inhaled.

9. IX. Silky
- Substance: A. copper
- Copper has a smooth, silky texture when polished.

10. X. Malleable
- Substance: G. aluminum
- Aluminum can be hammered into thin sheets, demonstrating 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
- Brittleness describes the tendency of a material to break into pieces under stress.

2. II. Has a strong smell
- Property: D. odour
- Odour is the scent or aroma of a substance.

3. III. Is silvery and shiny
- Property: F. lustre
- Lustre refers to the way a material reflects light, such as being shiny or dull.

4. IV. You can see through it
- Property: E. clarity
- Clarity refers to transparency or the ability to see through a material.

5. V. Feels rough and gritty
- Property: H. texture
- Texture describes the feel or surface quality of a material.

6. VI. Has an irregular shape
- Property: G. form
- Form refers to the shape or structure of a material.

7. VII. Solid
- Property: B. state
- State refers to whether a substance is solid, liquid, or gas.

8. VIII. Thick like syrup
- Property: M. viscosity
- Viscosity measures the thickness or resistance to flow of a liquid.

9. IX. Can be drawn into a wire
- Property: L. ductility
- Ductility is the ability of a material to be stretched into a wire.

10. X. Diamonds cannot be scratched
- Property: I. hardness
- Hardness measures a material's resistance to scratching or indentation.

11. XI. Can be hammered into a foil
- Property: K. malleability
- Malleability is the ability of a material to be flattened into thin sheets.

12. XII. Sour lemons
- Property: A. taste
- Taste is a sensory property describing how something tastes.

13. XIII. Yellow ruler
- Property: C. colour
- Colour is a visual property describing the hue of a material.

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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. B
- IX. A
- X. G
- 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:
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\boxed{
\text{See detailed solutions above.}
}
\]