Physical vs. Chemical properties (New)

The quick rule: If the chemical formula changed, it’s a ________ change; if not, it’s ________.

chemical; physical

A physical property is something you can observe/measure without changing ________ (e.g., density, melting point).

composition

A chemical property describes how a substance ________ to form ________ substances (e.g., flammability).

reacts; new

A physical change alters ________ or ________ but not composition.

form; state

A chemical change creates a ____ ____ from the original substance

new substance

Common physical properties: state (s/l/g), ________ point, ________ point, ________, solubility, conductivity, malleability.

melting; boiling; density

Common chemical properties: ____, the tendency of iron to ____, reactivity with ___, ___, and ___.

flammability; rust, acids, bases, oxygen

Phase changes (melt, freeze, boil, condense, sublime) are always ________ changes.

physical

Examples of physical changes: ________, ________, ________, ________.

dissolving, melting, boiling, condensing

Examples of chemical changes: ________, ________, ________ (acid + base).

burning, rusting, neutralization

Melting point is a physical ________ (a temperature); melting is a physical ________ (a process).

property; change

Dissolving NaCl in water is ________ because no ________ substances form.

physical; new

“Dissolving” is chemical if the solute ________ with water

reacts

Rusting is a chemical ________. The tendency to rust is a chemical ________.

change; property

Tarnishing silver (Ag) makes (Ag₂S), so it’s a ________ change.

chemical

Boiling water (H₂O(l) → H₂O(g)) is ________ change because the formula is the ________.

physical; same

Precipitation (mixing solutions and a solid appears) indicates a ________ change

chemical

Conductivity (electrical/thermal) is a ________ property—you can measure it without making ________ substances.

physical; new

If doubling the amount does not change the value, the property is ________.

intensive

If doubling the amount does double the value, the property is ________.

extensive

If doubling the amount does double the value, the property is ________.

extensive

Mass is an intensive or extensive property?

extensive

Volume is an intensive or extensive property?

extensive

Density (m/V) is an intensive or extensive property?

intensive

Temperature is an intensive or extensive property?

intensive

Heat is an intensive or extensive property?

Extensive (because doubling the substance requires more heat)

Melting point and boiling point are intensive or extensive properties?

Intensive (100mL or 200mL both melt or boil at the same temperature)

Humidity is an intensive or extensive property?

Intensive (doubling the same air still keeps the same humidity)

Molarity is an intensive or extensive property?

Intensive (doubling the same solution keeps the same molarity)