Flashcards in Properties and Structure of Materials Deck (127)
Substances that contain particles in the size range of 1-100 nm.
They have specific properties relating to the size of these particles which may differ from those of the bulk material.
It has mass and occupies space.
All substances are made up of elements, compounds or mixtures.
Define pure substances.
Homogenous matter with a definite fixed composition.
Examples are both elements and compounds.
5 examples of pure substances.
Fe, N₂, CO₂, HCl, H₂O
Pure substances made entirely of atoms of one element.
Cannot be separated into similar substances by chemical change.
4 examples of elements.
Ne, Al, Br₂, S₈
Pure substances composed of two or more different elements chemically combined in fixed proportions.
4 examples of compounds.
CO₂, HF, C₆H₁₂O₆, H₂O
A substance that contained 2 or more pure substances.
Also called homogeneous mixtures.
A mixture of constant bc imposition and properties throughout.
4 examples of solutions.
Air, seawater, stainless steel, smoke
Define heterogeneous mixtures.
Mixtures that have variable composition and properties throughout.
3 examples of heterogeneous mixtures.
Granite, soil, concrete
Substances that exist before a chemical reaction.
Substances formed as a result of a chemical reaction.
A group of atoms bonded together, forming a small independent group.
Both elements and compounds exist as molecules.
2 examples of molecules.
Define physical properties.
Properties of a substance that can be determined without changing the chemical composition.
3 examples of physical properties.
Boiling point, odour, colour
Define chemical properties.
Properties of a substance that relate to the ability of the substance to form new substances.
3 examples of chemical properties.
Ability to react with water, oxygen or acids
Define boiling point.
The temperature at which the vapour pressure of a liquid is equal to surrounding atmospheric pressure.
Define melting point.
The temperature at which a solid changes state into a liquid
A measure of how resistant solid matter is to various kinds of permanent shape change when a force is applied.
The ability of any substance to dissolve in a solvent to form a homogenous solution.
A measure of the ability of a substance to conduct an electric current.
The ability of a material to be beaten into a sheet.
Metals tend to be malleable, other materials tend do be brittle.
The ability of a material to be drawn in to a wire.
The ability of a substance to reflect light.