elements, compounds and mixtures Flashcards
1
Q
what is an element?
A
all atoms are the same
2
Q
every element has a _____ and every _____ starts with a _____
A
symbol, symbol, capital letter
3
Q
what is a compound?
A
contain two or more different elements chemically combined in fixed proportions
4
Q
what are the properties of a compound?
A
completely different to elements they are made from
5
Q
what does magnesium sulfide form?
A
white crystals
6
Q
what is a mixture?
A
different elements or compounds but they are not chemically combined
7
Q
how do we separate mixtures?
A
physical separation techniques such as filtration distillation, crystallisation.
8
Q
what is a molecule?
A
any elements combined even if they are the same
9
Q
examples of molecules
A
water, ammonia and methane
