Chemistry Flashcards
Chemical Properties
properties that describe how a substance combines with other substances to form new chemicals or how a substance breaks up into two or more different substances.
Physical Properties
properties that describe how a substance combines with other substances to form new chemicals or how a substance breaks up into two or more different substances.
Chemical Change
The process of a new substance being formed.
Physical change
Change in which no new chemical substances are formed.
Evaporates
Change state from a solid to a gas. Evaporation only occurs from the surface of a liquid.
State
Condition or phase of a substance. The three main states of matter are solid, liquid and gas.
Chemical Reaction
a chemical change in which one or more new chemical substances are produced.
Reactant
chemical substance used up in a chemical reaction. Some chemical bonds in a reactant are broken during the reaction.
Products
new chemical substance that results from a chemical reaction.
Precipitate
solid product of a chemical reaction that does not dissolve in water.
Reaction Rate
Speed at which a reaction takes place.
Catalyst
chemical that helps to start or speed up a chemical reaction.
Enzymes
special chemicals that speed up reactions but are themselves not used up in the reaction.
Rusting
A brown substance formed when iron reacts with oxygen and water.
Corrosion
a chemical reaction that wears away a metal. Air, water or chemicals in air and water, as well as many household substances, can be corrosive. Many acids and other corrosive substances are dangerous.
Surface protection
coating over a metal surface to prevent corrosion.
Galvanising
protecting a metal by covering it with a more reactive metal that will corrode first.
Plastic
Synthetic substance capable of being moulded.
Natural fibres
fibres that form naturally; that is, they have not been made by humans. Natural fibres include wool and silk from animals and cotton from plants.
Nylon
synthetic fibre. The monomers are joined by the elimination of water molecules at the joins.
Polyester
synthetic fibre. The monomers are joined by the elimination of water molecules at the joins.
Spinneret
device like a nozzle with small holes through which a plastic material passes, forming threads.
Durability
the quality of lasting, not easily being worn out.
Elastic
describes a material that is able to return to its original size after being stretched.
Elastic
describes a material that is able to return to its original size after being stretched.
Biodegradeble
describes a substance that breaks down or decomposes easily in the environment.
Organisms
Living things
