Lesson 1 elements, compounds and mixtures Flashcards
1
Q
In an element, all the atoms are the ______
A
same
2
Q
A compound contains….
A
two or more different elements chemically combined in fixed proportions
3
Q
in a mixture, we have
A
different elements or compounds not chemically combined
4
Q
To separate a mixture what can we use
A
physical separation techniques
5
Q
what are the physical separation techniques we could use
A
filtration
distillation
crystallisation
chromatography
6
Q
a molecule has …
A
any elements chemically combined, even if they’re the same element
7
Q
to separate a compound back to its original element, we can use…
A
chemical reactions
8
Q
usually compounds form totally different…
A
properties than what they’re made of
