Question

physical and chemical properties and changes
name test key
physical property

1. observed with senses
2. determined without destroying matter

chemical property

1. indicates how a substance reacts with something else
2. matter will be changed into a new substance after the reaction

identify the following as a chemical (c) or physical property (p):

1. blue color
2. density
3. flammability (burns)
4. solubility (dissolves)
5. reacts with acid
6. supports combustion
7. sour taste
8. melting point
9. reacts with water
10. hardness
11. boiling point
12. luster (shiny/not shiny)
13. odor
14. reacts with air

Explanation:

Step1: Recall physical property definition

Physical properties are observed with senses and determined without destroying matter.

Step2: Recall chemical property definition

Chemical properties indicate how a substance reacts with something else and matter is changed into a new substance after the reaction.

Step3: Analyze each property

• Blue color: Observed with eyes, no chemical change, P.
• Density: Measured without changing substance, P.
• Flammability: Substance changes when burns, C.
• Solubility: Just dissolving, no new substance formed, P.
• Reacts with acid: New substances formed, C.
• Supports combustion: Chemical - reaction involved, C.
• Sour taste: Observed with taste - buds, no chemical change, P.
• Melting point: Change of state without new substance, P.
• Reacts with water: New substances may form, C.
• Hardness: Measured without chemical change, P.
• Boiling point: Change of state without new substance, P.
• Luster: Observed with eyes, no chemical change, P.
• Odor: Observed with nose, no chemical change, P.
• Reacts with air: Chemical reaction occurs, C.

Answer:

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