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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:
ENERGY: Action of electricity on materials
Zinc is a metal. How does it conduct electricity?
By moving atoms.
By moving free electrons.
By moving ions.
By moving molecules.
Why is wood a non-conductor?
It's flammable.
It does not have free electrons or mobile ions.
It absorbs water easily.
It has a crystalline structure.
Which of the following materials is generally considered an electrical insulator?
Water (pure).
Zinc.
Plastic.
Sodium chloride solution.
Fused (molten) lead(II) bromide (PbBr₂) conducts electricity because of the presence of:
Atoms.
Free electrons.
Molecules.
Mobile ions.
If a substance conducts electricity when molten but not when solid, it is most likely a:
Semiconductor.
Metal.
Ionic compound.
Covalent compound.
