CEM 141 Master Exam Questions with 100% Complete Solutions

CEM 141 Master Exam Questions with 100%
Complete Solutions
True or False - A pure substance has a fixed composition and cannot be separated by

physical means.

True

Multiple Choice - Which of the following is a compound?

A) Iron (Fe)

B) Oxygen (O₂)

C) Water (H₂O)

D) Hydrogen (H₂)

C) Water (H₂O)

Multiple Choice - Which of the following exist as diatomic molecules?

A) Sodium (Na)

B) Oxygen (O₂)

C) Copper (Cu)

D) Gold (Au)

B) Oxygen (O₂)

Multiple Choice - Which of the following is a heterogeneous mixture?

A) Air

B) Salad

C) Kool-Aid

D) Brass

,B) Salad

True or False - Homogeneous mixtures look the same throughout.

True

Multiple Choice - Which separation method is best for separating liquids with different

boiling points?

A) Evaporation

B) Distillation

C) Chromatography

D) Filtration

B) Distillation

Multiple Choice - Chromatography separates mixtures based on:

A) Boiling points

B) Molecular interaction and solubility

C) Density

D) Particle size

B) Molecular interaction and solubility

True or False - Solids are compressible and have a definite shape.

False

True or False - Liquids have a definite volume but no definite shape.

True

, True or False - Gases have no definite shape or volume and are highly compressible.

True

Multiple Choice - Which is a physical change?

A) Burning gasoline

B) Melting ice

C) Rusting iron

D) Electrolysis of water

B) Melting ice

Multiple Choice - Which is a chemical change?

A) Boiling water

B) Breaking a pencil

C) Burning wood

D) Sublimation of dry ice

C) Burning wood

True or False - Intensive properties depend on the amount of substance.

False

Multiple Choice - Which is an example of an intensive property?

A) Mass

B) Volume

C) Density

D) Energy