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.
1. Summer Sausage
3. Salt Water
4. Pencil lead (Pb)
7. Silver (Ag)
8. Toothpaste (Na2HPO4)
9. A burrito
10. Italian Dressing
11. Chicken Soup
Also, review the notes in your notebook.