Review and Practice on Chemical vs. Physical Properties and Changes


Review of Chemical vs. Physical Properties and Changes

  • Chemical vs. Physical Properties.

    • Chemical properties are properties of an element or compound in chemical reactions. For example, the fact that sodium reacts with water is a chemical property.
    • Physical properties are properties of an element or compound that can be observed without a chemical reaction of the substance. A substance's color and density are physical properties.

  • Chemical vs. Physical Changes.

    • In a physical change, the substances are not altered chemically, but merely changed to another phase (i.e. gas, liquid, solid) or separated or combined.
    • In a chemical change, the substances are altered chemically and display different physical and chemical properties after the change.

Practice on Identifying Chemical and Physical Properties

Water boils at 100 degrees Celcius.

  • This is a physical property.
  • This is a chemical property.
Diamonds are capable of cutting glass.

  • This is a physical property.
  • This is a chemical property.
Water can be separated by electrolysis into hydrogen and oxygen.

  • This is a physical property.
  • This is a chemical property.
Sugar is capable of dissolving in water.

  • This is a physical property.
  • This is a chemical property.
Vinegar will react with baking soda.

  • This is a physical property.
  • This is a chemical property.
Yeast acts on sugar to form carbon dioxide and ethanol.

  • This is a physical property.
  • This is a chemical property.
Wood is flammable.

  • This is a physical property.
  • This is a chemical property.
Aluminum has a low density.

  • This is a physical property.
  • This is a chemical property.
Ammonia is a gas at room temperature.

  • This is a physical property.
  • This is a chemical property.
Bromine has a red color.

  • This is a physical property.
  • This is a chemical property.

Practice on Identifying Chemical and Physical Changes

Dry ice, solid carbon dioxide, is sublimed at room temperature.

  • This is a physical change.
  • This is a chemical change.
Salt is dissolved in water.

  • This is a physical change.
  • This is a chemical change.
Iron rusts in a damp environment.

  • This is a physical change.
  • This is a chemical change.
Gasoline burns in the presence of oxygen.

  • This is a physical change.
  • This is a chemical change.
Hydrogen peroxide decomposes to water and oxygen.

  • This is a physical change.
  • This is a chemical change.

Identifying Different types of Matter.

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