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ENERGY: Action of electricity on materials
ENERGY: Action of heat on materials
MATTER - PROPERTIES AND TRANSFORMATION: Chemical Reactions And Equations
MATTER - PROPERTIES AND TRANSFORMATION: Chemical Symbols, Formulae And Valency
MATTER - PROPERTIES AND TRANSFORMATION: Effect Of Heat On Substances
MATTER - PROPERTIES AND TRANSFORMATION: Introduction To Chemistry - Symbols
MATTER - PROPERTIES AND TRANSFORMATION: Mixtures And Pure Substances
MATTER - PROPERTIES AND TRANSFORMATION: Periodic table - Families of elements and Relative reactivity
MATTER - PROPERTIES AND TRANSFORMATION: Reaction With Oxygen of air
MATTER - PROPERTIES AND TRANSFORMATION: The Atom And Sub-Atomic Particles
5/50 MCQs for:
MATTER - PROPERTIES AND TRANSFORMATION: Mixtures And Pure Substances
Chromatography works on the principle that components of a mixture have different:
Solubilities in the mobile phase and affinities for the stationary phase.
Boiling points.
Melting points.
Sizes and shapes.
Which state of matter has a definite volume but takes the shape of its container?
Liquid.
Gas.
Plasma.
Solid.
What is a key criterion for determining the purity of a substance using its melting point?
A melting point that changes over time.
A sharp and constant melting point.
A wide range of melting temperatures.
The substance does not melt.
What is the Rf value in chromatography?
Retention factor, ratio of distance moved by spot to distance moved by solvent front.
Reaction frequency, how fast the components react.
Resistance factor, how much the paper resists the solvent.
Retention force, how strongly the components stick to the paper.
The process of turning a liquid into a solid is called:
Melting.
Freezing.
Sublimation.
Boiling.
