Pure substances and Mixtures
What is a pure substance?
Only one kind of substance present
What is soluble?
Describes a substance that will dissolve in a liquid.
What is Magnetic separation? A method of separating magnetic materials from nonmagnetic ones.
A method of separating magnetic materials from nonmagnetic ones.
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What is a mixture?
Is made of 2 or more materials physically combined; can be separated
Is made of 2 or more materials physically combined; can be separated
What is Dissolving?
become or cause to become incorporated into a liquid so as to form a solution.
What is evaporation?
A separation technique that uses evaporation to separate the parts of a solution. The solvent evaporates and leaves behind the solute as crystals.
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What is a colloid?
A colloid with droplets of one liquid spread evenly through another e.g. homogenised milk
What is a molecule?
two or more atoms joined together
What is centrifuging?
Separating a mixture by rotating the container quickly. The heavier parts of the mixture move to the outside of the spinning container.
What is an atom?
smallest building block in everything around us
What is a heterogeneous mixture?
Has a different appearance and composition throughout.
What is a suspension?
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.
A mixture is heated so that one substance evaporates. The vapor is collected and condensed into a liquid.
distillation
What is a hypothesis?
a testable, proposed explanation for a phenomenon that serves as a starting point for research
What is a homogeneous mixture?
Has the same appearance and composition throughout.
What is a solution?
A solute dissolved in a solvent
What is chromatography?
process of separating out parts of chemical mixtures (usually colours) dissolving them onto an absorbent material (usually paper)
State change from solid to a gas
What is sublimation?