Purpose: To investigate several properties of seven elements and based on those properties identify each element as metal, nonmetal, or metalloid.
Materials: Seven elements, Conductivity tester, Hammer, 1M HCl,
- At each lab table a different element is located. You will perform the same tests and/or observations at each station. You will move at the direction of the teacher.
- Appearance: Observe and record the appearance of each element, including physical properties such as color, luster, and form.
- Conductivity: You will test the conductivity of each element. An element is either a conductor or a nonconductor.
- Crushing: Gently tap each element with your hammer. Each element is either brittle (shatters when struck) or malleable (flattens in a thin sheet).
- Reactivity with acid: Place a small piece of the element in a well place with 15-20 drops of 1M HCl. Remember the indicators of a chemical reaction.
- Observe and record your results at each lab station.
|Element||Appearance||Conductivity||Result of Crushing||Reaction with HCl|
- Classify each property tested in this activity as either a physical property or a chemical property.
|Activity||Physical or Chemical|
|Result of Crushing|
|Reaction with HCl|
- Sort the coded elements tested into two groups based on similarities or differences in their physical or chemical properties.
- Which element (s) can be placed into either group?
- Using the following information, classify each element tested as a metal, nonmetal, or metalloid.
- Metals have a luster, are malleable, and conduct electricity.
- Many metals react with acids.
- Nonmetals are usually dull in appearance, are brittle, and do not conduct electricity.
- Metalloids have some properties of both metals and nonmetals.
|Element||Metal, Nonmetal, or Metalloid|