Name: ______Answer Key______Date: ______Period: ______

That’s Classified! – Classifying Matter Worksheet – ANSWER KEY

Elements and Compounds

  1. Define the word “element”:pure substance, comprised a single type of atom, homogeneous.
  1. What is an example of an element that you see/use every day?Oxygen, carbon, lead, etc.
  1. Define the word “compound”:pure substance, made of 2+ elements (different types of atoms)
  1. ____elements______and _____compounds______are pure substances, with a unique set of _____physical______and _____chemical______properties.

Mixtures

  1. Define the word “mixture”:made of 2+ substances that retain (keep) their individual identities (properties), can be separated (easily)
  1. A mixture that has visibly different parts is called a heterogeneous mixture. An example of this type of mixture would be examples will vary – oil/water, 8th grade dance.
  2. A mixture that does NOT contain visibly different parts is called a homogeneous mixture. An example of this type of mixture would be examples will vary – milk, coffee, high school dance.

Putting It All Together…

Complete the following by filling in the appropriate word from the list below:

elementscompoundmatterphysicalchemical

propertiespureperiodic tablecarbon dioxide

  1. matter is anything that has mass and volume.
  1. chemical changes alter the identity of a substance, whereas physical changes do not.
  1. elements cannot be separated by physical or chemical means.
  1. Elements are organized on the periodic table.
  1. Two or more elements chemically combined make up a compound.
  1. Carbon is an example of an element and carbon dioxide is an example of a compound.
  1. Elements and compounds are called puresubstances because they have a unique set of chemical and physical properties.

Material

/

Pure Substance

or Mixture / Element, Compound,
Homogeneous, Heterogeneous
concrete / Mixture / Heterogeneous
sugar + pure water
(C12H22O11 + H2O) / Mixture / Compound
iron filings (Fe) / Pure Substance / Element
limestone (CaCO3) / Pure Substance / Element
orange juice (w/pulp) / Mixture / Heterogeneous
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 / Mixture / Heterogeneous
salt + pure water
(NaCl + H2O) / Mixture / Homogeneous
benzene (C6H6) / Pure Substance / Compound
muddy water / Mixture / Heterogeneous
brass
(Cu mixed with Zn) / Mixture / Homogeneous
baking soda (NaHCO3) / Pure Substance / Compound