Mixtures And Pure Substances Flashcards
(9 cards)
What is a homogeneous mixture?
A mixture of uniform composition throughout, with components distributed at a molecular level
Examples include copper, sugar, whiskey, salt solution, and air.
What is a heterogeneous mixture?
A mixture with non-uniform composition, not evenly distributed
Examples include muddy water, concrete, and marmalade.
What is a pure substance?
A substance that is not contaminated by any other substance.
What defines an impure substance?
A substance contaminated with small amounts of one or more other substances, making it a mixture.
What is an element?
A pure substance that cannot be decomposed into simpler substances.
What is a compound?
A pure substance that can be decomposed into simpler substances, such as elements.
List the characteristics of a compound.
- Made up of two or more elements
- Always has the elements present in the same ratio by mass
- Has properties that are quite different from those of the elements that make it up.
Fill in the blank: A pure substance is not contaminated by any other _______.
[substance]
True or False: An impure substance can be considered a mixture.
True
