Unit B - Section 1 Flashcards
Change from solid to liquid is…
Melting point
A change from liquid to gas is…
Evaporation
A change from gas to liquid is…
Condensation
A change from liquid to solid is…
Freezing point
A solid can change directly into a gas is…
Sublimation
A gas can change directly into a solid is…
Deposition
What r properties?
Characteristics that can be used to describe a substance
Physical properties can be used to…
Identity matter; examples r colour and lustre. The temperature at which a substance melts is also a physical property
Its important to remember that…
When a substance undergoes a physical change, such as melting it’s appearance or state may be altered but it’s composition stays the same
Melting point
The melting point of a substance is the temperature at which it changes from solid to a liquid
Boiling point
The boiling point of a substance is the temperature at which it’s liquid phase changes to the gas phase
Hardness
Hardness is a substance with the ability to resist being scratched
Malleability
A substance that can be pounded or rolled into sheets is said to be malleable; such as gold and tin
Ductibility
Any solid that can be stretched into a long wire is said to be ductile
Crystal shape
The shape of a substances crystals can help identify it
Solubility
Is the ability of a substance to be dissolved in another
Density
Is the amount of mass in a given volume of a substance
Conductivity
Is the ability of a substance to conduct electricity or heat
Chemical properties
Reaction with acids
Ability to burn
Reaction with water
Behaviour in air
Reaction to heat
Chemical property describes
How a substance interacts with other substances such as acids
A chemical change
Results in the formation of a different substance or substances
Pure substance
Made up of only one kind of matter and has a unique sets it apart from any other kind of matter
Element
Material that cannot be broken down into any simpler substance
Compound
When two or more elements combine chemically they form a compound
