PURE SUBSTANCES AND MIXTURES Flashcards
Have a definite (constant) composition and distinct properties
Pure Substance
They differ from one another in composition and can be identified by their appearance, smell, taste, and other properties
Pure Substance
Can be either elements or compounds
Pure Substance
A substance that cannot be separated into simpler substances by chemical means.
Elements
Substance composed of atoms of two or more elements chemically united in fixed proportions.
Compound
Combination of two or more substances in which the substances retain their distinct identities
Mixture
Do not have constant composition. Any mixture can be created and then separated by physical means into pure components without changing the identities of the components.
Mixture
Can either be homogeneous or heterogeneous
Mixture
Mixture in which the components mix with each other and its composition is uniform throughout the solution
Homogeneous Mixture
A homogeneous mixture of one or more solutes dissolved in a solvent
Solution
___________ is the substance that is present in the greatest amount
Solvent
Mixture in which the composition is not uniform throughout and different components are observed.
Heterogeneous
Types of Heterogeneous mixture
- Suspension
- Colloids
Type of mixture in which particles do not fall out due to typical filtering methods, but can be separated out using special methods such as centrifugation
Colloids
Appear as cloudy and particles of colloid are small enough to pass through and small enough not to settle down
Colloids
