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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 heat on materials
What is the approximate percentage of oxygen in the air that supports combustion?
1%.
21%.
78%.
0.03%.
What type of energy uses the potential energy of water stored at a height?
Ocean thermal energy.
Tidal energy.
Hydroelectric energy.
Geothermal energy.
The action of heat on substances leading to a change in their chemical composition is called:
Melting.
Thermal decomposition.
Evaporation.
Dissolution.
A reversible reaction is one where:
Products can reform into reactants.
It always produces light.
It has a constant temperature.
It only proceeds in one direction.
When sugar is heated, the water produced is in what state?
Plasma.
Solid.
Gas (vapor).
Liquid.
