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.


Elements:

·       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_.


Compounds:

·       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. 


Mixtures:

·       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

HM

Chunky, Brown

2. Steam

C

Gas, Hot

3. Salt Water

S

Liquid, Clear

4. Pencil lead (Pb)

E

Grey, Solid

5. Dirt

HM

Brown, Solid

6. Pepsi

HM

Brown, Liquid

7. Silver (Ag)

E

Silver, Solid

8. Toothpaste (Na2HPO4)

C

White, Thick

9. A burrito

HM

Multi-colored, Solid

10. Italian Dressing

HM

Liquid, Greasy

11. Chicken Soup

HM

Liquid/Solid, Brown

12. Lemonade

S

Yellow, Liquid


Also, review the notes in your notebook.