Understanding Matter: Substances, Mixtures, Solutions

Posted on Mar 8, 2025 in Chemistry

Understanding Matter: Substances, Mixtures, and Solutions

True or False:

  1. T – A substance is matter that is always made up of the same combination of atoms.
  2. F – A mixture is matter that is made up of atoms of two or more elements chemically bonded together.
  3. F – In a homogeneous mixture, substances are not evenly mixed.
  4. T – In a mixture, the components keep their own properties.

Multiple Choice:

  1. In which way do mixtures differ from compounds?
    • C. A mixture requires a physical change; a compound requires a chemical one.
  2. Another name for a homogeneous mixture is
    • B. A solution.
  3. A compound is the chemical bonding of
    • A. Two or more elements.
  4. Which item is a mixture?
    • A. Air
  5. A sample of matter that contains only one kind of atom would be classified as
    • A. An element.
  6. A substance is matter that is made up of
    • D. The same combination of atoms all the time.

Mixtures and Compounds

  1. A mixture results from a physical change, and a compound results from a chemical one.
  2. A compound is matter that is made up of atoms of two or more elements that are chemically bonded together.
  3. A homogeneous mixture is another name for a solution.
  4. A heterogeneous mixture is one in which substances are not evenly mixed.

Solubility and Solutions

  1. Which type of solute is least likely to dissolve in water?
    • C. Nonpolar
  2. Which action will make a solid solute dissolve more slowly in a liquid solvent?
    • B. Decreasing the solvent’s temperature
  3. For which solution would mass per volume be used to describe concentration?
    • A. Salt in water
  4. The substance that exists in the greatest quantity in a solution is the solvent.
  5. A polar molecule has a slightly negative end and a slightly positive end.
  6. A solution’s concentration tells how much solute is in it.
  7. A solute’s solubility is the maximum amount that can dissolve in a given amount of solvent at a given temperature and pressure.
  8. Which characteristic of water molecules best explains why most water on Earth contains dissolved solvents?
    • C. Structure
  9. Pressure is a factor that would affect the solubility of
    • C. Carbon dioxide gas in soda.
  10. For which solution would percent by volume be used to describe concentration?
    • C. Sugar in soda
  11. What will happen to the solubility of KCl if the temperature decreases?
    • Solubility will decrease.
  12. What will happen to the solubility of Ce2(SO4)3 if the temperature increases?
    • It will stay the same or decrease.
  13. Is used to test the pH level in a solution.
    • C. An indicator
  14. How could a person increase the concentration of a solution?
    • A. By adding more solute to the solution
  15. Which formula can be used to calculate concentration?
  • B. [Formula would go here, but was not provided in the original text]
A glass of lemonade contains 90 percent water, 7 percent lemon juice, and 3 percent sugar. Which substance is the solvent in this solution?
  • A. Water