CSS - PMS - CCE - PCS - General Science
Basic Chemistry - Matter
Which physical property is defined as mass per unit volume?
A. Pressure
B. Density
C. Viscosity
D. Temperature
Correct Answer: B
Density is calculated as mass divided by volume.
CSS - PMS - CCE - PCS - General Science
Basic Chemistry - Matter
Which property is generally conserved during an ordinary chemical reaction in a closed system?
A. Mass
B. Color
C. Shape
D. Volume in all cases
Correct Answer: A
The law of conservation of mass applies to ordinary chemical reactions in closed systems.
CSS - PMS - CCE - PCS - General Science
Basic Chemistry - Matter
Which state of matter consists largely of ions and free electrons?
A. Bose glass only
B. Plasma
C. Solid
D. Liquid
Correct Answer: B
Plasma is an ionized state containing charged particles.
CSS - PMS - CCE - PCS - General Science
Basic Chemistry - Matter
What is the change from liquid to gas at the surface below boiling point called?
A. Freezing
B. Deposition
C. Evaporation
D. Solidification
Correct Answer: C
Evaporation is a surface phenomenon that can occur below the boiling point.
CSS - PMS - CCE - PCS - General Science
Basic Chemistry - Matter
What is the change from gas to liquid called?
A. Evaporation
B. Condensation
C. Sublimation
D. Fusion
Correct Answer: B
Condensation occurs when gas particles lose energy and form a liquid.
CSS - PMS - CCE - PCS - General Science
Basic Chemistry - Matter
What is the change from solid directly to gas called?
A. Freezing
B. Melting
C. Condensation
D. Sublimation
Correct Answer: D
Sublimation bypasses the liquid phase.
CSS - PMS - CCE - PCS - General Science
Basic Chemistry - Matter
Which state of matter has neither a fixed shape nor a fixed volume?
A. Solid
B. Crystal only
C. Liquid
D. Gas
Correct Answer: D
A gas expands to fill its container.
CSS - PMS - CCE - PCS - General Science
Basic Chemistry - Matter
Which state of matter has a definite volume but takes the shape of its container?
A. Solid
B. Gas
C. Vacuum
D. Liquid
Correct Answer: D
Liquids flow and adopt container shape while remaining nearly incompressible.
CSS - PMS - CCE - PCS - General Science
Basic Chemistry - Matter
Which state of matter has a definite shape and definite volume?
A. Plasma only
B. Liquid
C. Gas
D. Solid
Correct Answer: D
Particles in a solid remain in fixed relative positions, giving a definite shape and volume.
CSS - PMS - CCE - PCS - General Science
Basic Chemistry - Matter
Which definition best describes matter?
A. Anything that emits light
B. Anything that has mass and occupies space
C. Only substances visible to the eye
D. Only solids
Correct Answer: B
Matter has mass and occupies volume.