Science S1 Chapter 3 ECM Flashcards
REFER TO NOTES PAGE 9
Description of an element
An element is the basic building block(s) of living and non-living matter
What is the definition of an element?
An element is a pure substance that cannot be broken down into simpler substances by chemical methods (heating / use of light)
second way elements can be classified
as metals or non metals
is an element an impure or pure substance?
pure
first way elements can be classified
by their state (solid / liquid / gas) at room temperature
definition of a compound
a compound is a pure substance containing two or more elements that are chemically combined in a fixed ratio by mass
third way elements can be classified
arranged in the periodic table
is a compound a pure or impure substance?
pure
what is the first characteristic of a compound?
different elements in a compound are chemically joined together in a fixed ratio by mass
what is the third characteristic of a compound?
compounds cannot be separated into their elements by physical means methods
what is the second characteristic of a compound?
compound have different properties from the elements they are made of
the second characteristic of a mixture
a mixture has the properties of the substances that it is made of
definition of a mixture
a mixture is made up of two or more substances that are not joined together chemically
is a mixture a pure substance?
no
the third characteristic of a mixture
a mixture can be easily separated into its components by physical means
the first characteristic of a mixture
the substances in a mixture can be mixed in any proportion
there are 4
what are the properties of non-metals?
- usually poor conductors of heat and electricity
- usually dull and soft (non-metals that are solid)
- brittle (solid non-metals)
- does not corrode
there ar 5
what are the properties of metal?
- good conductors of heat and electricity
- shiny (some are dull on the surface but shiny underneath)
- malleable (can be beaten into different shapes without breaking)
- ductile (can be pulled into thin wire without breaking)
- some corrode easily (gold doesnt)
what is the first way we can use to identify elements in a compound?
by its chemical name