chem Flashcards
(19 cards)
elements
substance that contains only one typeof atom
smallest part of an element
an atom
What is a compound?
a substance comprised of two or more elements chemically bonded together.
Which properties could be different when elements combine to form a compound?
density, mass state of matter, other physical
How are metals and non metals arranged in a chemical name?
The metal comes first and stays the same, the non-metal comes second and changes
atoms
incredibly tiny particles that make up all substances.
an element
cannot be broken down into other substances
is made of one type of atom only
molecule
A molecule is made up of atoms all chemically bonded to
each other.
mixture
made when two or more substances are combined, but they are not combined chemically.
a compound
made of two or more different atoms chemically bonded
together.
can be broken down into other substances.
how many elements are there?
118
Why are elements sometimes called
‘pure’?
Those which are, do not consist of any other substances
Can an element be broken down into
anything?
no because they are made of only one type of atom.
Do atoms have the same properties as the element
No, difference in density mass ability to conduct electricity etc.
Are all atoms the same?
No, difference in the number of protons electrons and neutrons make atoms different to each other.
physical properties
sonorous, ductile, shine, melting and boiling points, dull, brittle,
2 differences between elements and compounds
elements are comprised of only one type of atom. Compounds are made if two or more types of atoms. Elements cannot be broken down, compounds can.
small number in equation
indicates number of atoms in the element
big number in equation
indicates how many units of the compound
