Module 1B

• Why do consumers find chemical formulas confusing?

  Due to lack of understanding of chemical formulas
• What is a chemical substance?

  A form of matter with constant composition
• What does a chemical formula represent?

  A symbolic expression of a compound
• What does a subscript in a chemical formula indicate?

  The number of atoms of an element
• What does the formula CO2 represent?

  Carbon dioxide
• What information can be derived from the formula CO2?

  It contains carbon and oxygen atoms
• What does the first chemical symbol in a formula indicate?

  It is the central atom of the molecule
• In CO2, what does the subscript of oxygen indicate?

  There are two oxygen atoms
• What is the chemical formula for water?

  H2O
• What are the types of atoms and their chemical symbols in water?

  • Hydrogen (H)
  • Oxygen (O)
• What is the chemical formula for sodium chloride?

  NaCl
• What is the use of ammonia in agriculture?

  Used as fertilizer
• What is the chemical formula for hydrochloric acid?

  HCl
• What is the primary use of bleach?

  As a disinfecting agent
• What are the uses of common chemical substances listed in Table 2?

  • Acetylene: Fuel gas for welding
  • Ammonia: Fertilizer in agriculture
  • Vitamin C: Prevents and treats scurvy
  • Baking Soda: Ingredient in baking
  • Bleach: Disinfecting agent
  • Borax: Cleaning agent
• What is the chemical formula for baking soda?

  NaHCO3
• What is the importance of recognizing chemical formulas?

  It helps understand elements and properties
• How does a chemical formula help predict the nature of a substance?

  By showing the elements and their organization
• What distinguishes a chemical substance from a mixture?

  A chemical substance has a constant composition
• What is the chemical formula for sulfuric acid?

  H2SO4
• What does the chemical formula for sodium hydroxide indicate?

  It contains sodium, oxygen, and hydrogen