elements can combine to form molecules and compounds Flashcards
1
Q
what are molecules?
A
2 or more of the same element held together by chemical bonds (e.g. O2)
2
Q
what are compound(s)?
A
substance containing of 2 or more different elements combined in a fixed ratio
3
Q
what’s an example of a compound?
A
table salt (sodium chloride or NaCl)
sodium- metal
chloride- poisonous gas
chemically combined, edible emerges
4
Q
chemical elements combine in … to form …
A
chemical elements combine in fixed ratios to form compounds
5
Q
many of the compounds in living organisms contain…
hint: c.h.o.n
A
carbon
hydrogen
oxygen
nitrogen
6
Q
DNA contains all 4 of these elements
hint: c.h.o.n
A
carbon
hydrogen
oxygen
nitrogen
