Question

worksheet
define physical property\tdefine chemical property

for the following properties- identify if they are physical (p) or chemical (c)

1. \t__________ hardness
2. \t__________ melting point
3. \t__________ flammability (burns)
4. \t__________ malleability
5. \t__________ luster
6. \t__________ reacts with air (tarnish)
7. \t__________ density
8. \t__________ red color
9. \t__________ strong smell
10. \t__________ reacts with water (rusts)
11. \t__________ boiling point
12. \t__________ ductility
13. \t__________ sweet taste
14. \t__________ solubility (dissolves)
15. \t__________ reacts with acid
16. \t__________ a solid powder

Explanation:

To solve this, we first recall the definitions:

• Physical Property: A characteristic of a substance that can be observed or measured without changing its chemical identity (e.g., appearance, state, density, hardness, melting/boiling point, solubility, taste, smell, color, luster, malleability, ductility).
• Chemical Property: A characteristic that describes a substance’s ability to undergo a chemical change (e.g., flammability, reactivity with air, water, acid, rusting, tarnishing).

Now, we classify each property:

1. Hardness: Observed without chemical change → Physical (P).
2. Melting point: Measured without chemical change → Physical (P).
3. Flammability (burns): Involves combustion (chemical reaction) → Chemical (C).
4. Malleability: Observed without chemical change → Physical (P).
5. Luster: Observed without chemical change → Physical (P).
6. Reacts with air (tarnish): Chemical reaction (tarnish formation) → Chemical (C).
7. Density: Measured without chemical change → Physical (P).
8. Red color: Observed without chemical change → Physical (P).
9. Strong smell: Observed without chemical change → Physical (P).
10. Reacts with water (rusts): Rusting is a chemical reaction → Chemical (C).
11. Boiling point: Measured without chemical change → Physical (P).
12. Ductility: Observed without chemical change → Physical (P).
13. Sweet taste: Observed without chemical change → Physical (P).
14. Solubility (dissolves): Observed without chemical change (dissolution, not always a chemical reaction) → Physical (P).
15. Reacts with acid: Chemical reaction occurs → Chemical (C).
16. A solid powder: State/appearance, no chemical change → Physical (P).

Answer:

1. P - Hardness
2. P - Melting point
3. C - Flammability (burns)
4. P - Malleability
5. P - Luster
6. C - Reacts with air (tarnish)
7. P - Density
8. P - Red color
9. P - Strong smell
10. C - Reacts with water (rusts)
11. P - Boiling point
12. P - Ductility
13. P - Sweet taste
14. P - Solubility (dissolves)
15. C - Reacts with acid
16. P - A solid powder