Question

section #5: properties and changes in matter

1. classify the following properties as physical or chemical. if the property is physical, classify it as intensive or extensive.

property physical or chemical? intensive or extensive?
density
tendency to rust
malleability
combustibility
volume
burns in the presence of o₂
mass
boiling point
solubility
length
silver tarnishes in the presence of o₂

Explanation:

Step1: Recall property definitions

Physical properties can be observed without changing the substance's chemical identity. Chemical properties involve a change in chemical identity. Intensive properties don't depend on the amount of substance, and extensive properties do.

Step2: Analyze density

Density is a physical property as it can be measured without changing the substance chemically. It is intensive since it is the same for any amount of a pure substance ($\text{density}=\frac{\text{mass}}{\text{volume}}$).

Step3: Analyze tendency to rust

Tendency to rust is a chemical property because rusting is a chemical reaction (oxidation) that changes the substance's chemical identity.

Step4: Analyze malleability

Malleability is a physical property as it describes the ability to be hammered into sheets without changing the chemical identity. It is intensive as it is characteristic of the material itself.

Step5: Analyze combustibility

Combustibility is a chemical property as combustion is a chemical reaction that changes the substance's chemical identity.

Step6: Analyze volume

Volume is a physical property as it can be measured without chemical change. It is extensive as it depends on the amount of the substance.

Step7: Analyze burns in presence of O₂

Burning in the presence of O₂ is a chemical property as it involves a chemical reaction (combustion).

Step8: Analyze mass

Mass is a physical property as it can be measured without chemical change. It is extensive as it depends on the amount of the substance.

Step9: Analyze boiling point

Boiling point is a physical property as it can be determined without changing the chemical identity of the substance. It is intensive as it is characteristic of the substance.

Step10: Analyze solubility

Solubility is a physical property as it can be observed without changing the chemical identity of the solute. It is intensive as it is characteristic of the solute - solvent system.

Step11: Analyze length

Length is a physical property as it can be measured without chemical change. It is extensive as it depends on the amount of the substance.

Step12: Analyze silver tarnishes in presence of O₂

Silver tarnishing in the presence of O₂ is a chemical property as it involves a chemical reaction (oxidation).

Answer:

Property	Physical or Chemical?	Intensive or Extensive?
Tendency to Rust	Chemical	N/A (not applicable for chemical properties)
Malleability	Physical	Intensive
Combustibility	Chemical	N/A (not applicable for chemical properties)
Volume	Physical	Extensive
Burns in the presence of O₂	Chemical	N/A (not applicable for chemical properties)
Mass	Physical	Extensive
Boiling Point	Physical	Intensive
Solubility	Physical	Intensive
Length	Physical	Extensive
Silver Tarnishes in the presence of O₂	Chemical	N/A (not applicable for chemical properties)