Elements, Compounds and Mixtures Worksheet

Elements, Compounds & Mixtures Worksheet Part 1: Read the following information on elements, compounds and mixtures. Fill in the blanks where necessary. Elements (pure substances): 1. A pure substance containing only one kind of ____________. 2. An element is always uniform all the way through (homogeneous). 3. An element _____________ be separated into simpler materials (except during nuclear reactions). 4. Over 100 existing elements are listed and classified on the ____________________. Compounds (pure substances): 5. A pure substance containing two or more kinds of _______________. 6. The atoms are _________________ combined in some way. Often times (but not always) they come together to form groups of atoms called molecules. 7. A compound is always homogeneous (uniform). 8. Compounds ___________________ be separated by physical means. Separating a compound requires a chemical reaction. 9. The properties of a compound are usually different than the properties of the elements it contains. Mixtures: 10. Two or more ________________ or _________________ NOT chemically combined. 11. No reaction between substances. 12. Mixtures can be uniform (called ________________________) and are known as solutions. 13. Mixtures can also be non-uniform (called ________________________). 14. Mixtures can be separated into their components by chemical or physical means. 15. The properties of a mixture are similar to the properties of its components. Chemistry: Classifying Matter Classify each of the materials below. In the center column, state whether the material is a pure substance or a mixture. If the material is a pure substance, further classify it as either an element or compound in the right column. Similarly, if the material is a mixture, further classify it as homogeneous or heterogeneous in the right column. Write the entire word in each space to earn full credit. Material concrete sugar + pure water (C12H22O11 + H2O) iron filings (Fe) limestone (CaCO3) orange juice (w/pulp) Pacific Ocean air inside a balloon aluminum (Al) magnesium (Mg) acetylene (C2H2) tap water in a glass soil pure water (H2O) chromium (Cr) Chex mix salt + pure water (NaCl + H2O) benzene (C6H6) muddy water brass (Cu mixed with Zn) baking soda (NaHCO3) Pure Substance or Mixture Element, Compound, Homogeneous, Heterogeneous Chemistry: Classifying Matter Classify each of the materials below. In the center column, state whether the material is a pure substance or a mixture. If the material is a pure substance, further classify it as either an element or compound in the right column. Similarly, if the material is a mixture, further classify it as homogeneous or heterogeneous in the right column. Write the entire word in each space to earn full credit. Pure Substance or Mixture Element, Compound, Homogeneous, Heterogeneous Mixture Heterogeneous Mixture Compound iron filings (Fe) Pure Substance Element limestone (CaCO3) Pure Substance Element orange juice (w/pulp) Mixture Heterogeneous Material concrete sugar + pure water (C12H22O11 + H2O) Pacific Ocean Mixture Heterogeneous air inside a balloon Mixture Homogeneous aluminum (Al) Pure Substance Element magnesium (Mg) Pure Substance Element acetylene (C2H2) Pure Substance Compound tap water in a glass Mixture Homogeneous soil Mixture Heterogeneous pure water (H2O) Pure Substance Compound, chromium (Cr) Pure Substance Element, Chex mix salt + pure water (NaCl + H2O) Mixture Heterogeneous Mixture Homogeneous benzene (C6H6) Pure Substance Compound muddy water Mixture Heterogeneous brass (Cu mixed with Zn) Mixture Homogeneous baking soda (NaHCO3) Pure Substance Compound