Pure Substances and Mixture
Only one kind of substance present
What is a pure substance?
Describes a substance that will dissolve in a solution
What is solute?
A method of separating magnetic materials from nonmagnetic ones.
What is Magnetic separation?
Change state from solid to liquid.
Is made of 2 or more materials physically combined; can be separated
What is a mixture?
Describes a substance that has mixed completely with a liquid so that it is no longer visible.
A separation technique that uses evaporation to separate the parts of a solution. The solvent evaporates and leaves behind the solute as crystals.
What is crystallisation?
Change state from liquid to gas.
A colloid with droplets of one liquid spread evenly through another e.g. homogenised milk
What is an emulsion?
Describes a solution containing a small amount of solute
What is dilution/dilute solution?
Separating a mixture by rotating the container quickly. The heavier parts of the mixture move to the outside of the spinning container.
What is centrifuging?
Change state from gas to liquid.
Has a different appearance and composition throughout.
What is a heterogenous mixture?
A mixture of a gas or liquid and an insoluble substance. The insoluble substance settles to the bottom when the mixture is left to stand.
What is a suspension?
A mixture is heated so that one substance evaporates. The vapour is collected and condenses into a liquid.
What is distillation?
Change state from liquid to solid.
Has the same appearance and composition throughout.
What is a Homogenous mixture?
A solute dissolved in a solvent
What is a solution?
When separating oil and water, this method allows the denser liquid to be drained off first.
What is decanting/using a separating funnel?