elements, compounds and mixtures Flashcards
1
Q
what does the periodic table show us?
A
all the elements
2
Q
how many elements are there in the periodic table?
A
around 100
3
Q
what is an element?
what are every atom of elements given in the periodic table?
A
substance that is made up of only one type of atom.
a chemical symbol
4
Q
how are compounds formed?
A
when atoms of different elements are combined during a chemical reaction.
5
Q
what is the difference between a compound and a mixture?
A
compounds can separate back into elements only through chemical reactions.
mixtures are not chemically bonded and the chemical properties of each component in the mixture remains UNCHANGED
6
Q
what do compounds contain?
A
2 or more different elements chemically bonded at fixed proportions
