Elements, Compounds and Mixtures

Question 1

element definition

Answer 1

a pure substance that only consists of one type of atom

Question 2

compound definition

Answer 2

a substance that is made up of two or more different elements which are chemically bonded together

Question 3

what is a molecule with two atoms in it called?

Answer 3

a diatomic molecule

Question 4

is it difficult to separate a compound?

Answer 4

yes because it is chemically bonded

Question 5

why are mixtures easily separated?

Answer 5

• unlike in a compound, there is no chemical bond between the different parts of a mixture so the parts can be separated out by physical methods

Question 6

what are the properties of a mixture?

Answer 6

a mixture of the properties of the separate parts - it displays all properties of each atom

Question 7

mixture definition

Answer 7

a substance containing two or more substances which are not chemically joined

Question 8

why is a mixture not a pure substance?

Answer 8

a substance is only pure if it is completely made up of a single element or compound

Question 9

does every pure substance have a specific boiling point and melting point?

Answer 9

yes

Question 10

why do mixtures melt or boil gradually over a range of temperatures?

Answer 10

because a mixture is not pure