Elements, Compounds, Mixtures, Solutions

Elements, Compounds & Mixtures Worksheet

Part 1: Read the following information on elements, compounds and mixtures.  Fill in the blanks where necessary.


·       A pure substance containing only one kind of __atom____.

·       An element is always uniform all the way through (homogeneous).

·       An element __cannot___ be separated into simpler materials (except during nuclear reactions).

·       Over 100 existing elements are listed and classified on the _Periodic Table_.


·       A pure substance containing two or more kinds of __atoms__.

·       The atoms are ___chemically___ combined in some way.  Often times (but not always) they come together to form groups of atoms called molecules. 

·       A compound is always homogeneous (uniform).

·       Compounds ___cannot___ be separated by physical means.  Separating a compound requires a chemical reaction. 

·       The properties of a compound are usually different than the properties of the elements it contains. 


·       Two or more __elements___ or ____compounds__ NOT chemically combined.

·       No reaction between substances.

·       Mixtures can be uniform (called __homogeneous___) and are known as solutions.

·       Mixtures can also be non-uniform (called ____heterogeneous____).

·       Mixtures can be separated into their components by chemical or physical means.

·       The properties of a mixture are similar to the properties of its components. 

Part 2: Classify each of the following as elements (E), compounds (C) or Mixtures (M).  Write the letter X if it is none of these.

_E_Diamond (C)       _C_Sugar (C6H12O6)             _M_Milk                    _E_Iron (Fe)

_M_Air                      _C_Sulfuric Acid (H2SO4)   _M_Gasoline             _X_Electricity

_E_Krypton (K)        _E_Bismuth (Bi)                   _E_Uranium (U)            _M_Popcorn

_C_Water (H2O)       _C_Alcohol (CH3OH)          _M_Pail of Garbage         _M_A dog

_C_Ammonia (NH3)_C_Salt (NaCl)                     _X_Energy                 _E_Gold (Au)

_M_Wood                 _M_Bronze                            _M_Ink                      _M_Pizza

_C_Dry Ice (CO2)     _C_Baking Soda (NaHCO3)_E_Titanium (Ti)            _M_Concrete

Part 3: Match each diagram with its correct description.  Diagrams will be used once.

_C_1. Pure Element – only one type of atom present.

_E_2. Mixture of two elements – two types of uncombined atoms present.

_B_3. Pure compound – only one type of compound present.

_A_4. Mixture of two compounds – two types of compounds present.

_D_5. Mixture of a compound and an element. 

Part 4: Column A lists a substance.  In Column B, list whether the substance is an element (E), a compound (C), a Heterogeneous Mixture (HM), or a Solution (S).  (Remember a solution is a homogeneous mixture.)  In Column C, list TWO physical properties of the substance. 

Column A

Column B

Column C

1. Summer Sausage


Chunky, Brown

2. Steam


Gas, Hot

3. Salt Water


Liquid, Clear

4. Pencil lead (Pb)


Grey, Solid

5. Dirt


Brown, Solid

6. Pepsi


Brown, Liquid

7. Silver (Ag)


Silver, Solid

8. Toothpaste (Na2HPO4)


White, Thick

9. A burrito


Multi-colored, Solid

10. Italian Dressing


Liquid, Greasy

11. Chicken Soup


Liquid/Solid, Brown

12. Lemonade


Yellow, Liquid

Also, review the notes in your notebook.