Chapter 20 Elements, Compounds And Mixtures

Question 1

Molecule

Answer 1

Composed of two or more atoms chemically combined

Question 2

Compounds

Answer 2

Consist of two or more elements chemically combined

Question 3

Mixtures

Answer 3

Consist of two or more substances mingled together but not chemically combined

Question 4

Example of an element

Answer 4

Hydrogen
Nitrogen
Oxygen

Question 5

Example of a molecule

Answer 5

H20 (water molecule)

CO2 (carbon dioxide molecule)

Question 6

Example of compound

Answer 6

Water (hydrogen,oxygen) H2O
Table salt (sodium,chlorine) NaCL

Question 7

Name two differences between a compound and a mixture

Answer 7

C: made up of single substance
M:made up of 2 or more substances

C:difficult to separate the elements of a compound
M:usually easy to separate the substances in a mixture

Question 8

Element

Answer 8

A substance made up of only one type of atom