Chapter 1: Chemistry in Context Flashcards
(36 cards)
Chemistry
The study of the composition, properties, and interactions of matter.
Hypothesis
A tentative explanation of observations that MUST be testable and falsifiable
Theory
A well substantiated, comprehensive, testable explanation of aspect of nature
Macroscopic Domain
Everyday things, sensed and touched by humans
Microscopic Domain
Extremely small aspects, sometimes invisible to human eye
Symbolic Domain
Specialized language used to represent components of macro and microscopic domains, such as chemical symbols
Matter
Anything that takes up space and has mass
What are the four states of matter?
Solid, Liquid, Gas, Plasma
What is weight?
Refers to the force that gravity exerts on an object
What is Mass?
Measure of the amount of matter in an object
Law of Conservation of Matter
States that there will be no change in the quantity of matter present when it converts from one type of matter to another
Pure Substance
Has a constant composition of the same type of matter
Elements
Pure substances that cannot be broken down further
Compounds
Pure substances that are composed of two or more elements
How are compounds broken down?
By chemical changes
Mixture
Composed of two or more types of matter that can be present in varying amounts.
How can mixtures be seperated?
By physical changes
Homogeneous Mixture
exhibits a uniform composition and appears visually the same throughout
Heterogeneous Mixture
Mixtures with a composition that varies from point to point
Atom
Smallest particle of an element
Molecule
A bundle of two or more atoms
How do molecules move?
as a unit
Physical Property
characteristic of matter that is not associated with a change in chemical composition
Example of Physical Property
Color, density, hardness, melting/boiling point