GED Practice

GED Science Review: Properties of Matter

Questions:
Directions: Choose the answer to each question.

Questions 1 through 3 refer to the following paragraph and table.

Solubility is a chemical property referring to the ability of a given substance, the solute, to dissolve in a solvent. Several factors affect the rate at which substances dissolve. Small pieces of a solid dissolve faster than large pieces of the same substance. Smaller pieces have more surface area that is in contact with the solutes dissolve faster in a hot solvent than in a cold solvent. The kinetic theory states that when matter is heated, its particles move faster. Faster-moving solvent particles run into undissolved solute more often. The greater frequency and energy of the collisions help "knock" undissolved solute particles away from each other and spread them throughout the solution. Other factors that affect solubility include pressure, pH, concentration, and state of matter of the solute. For example, gases are more soluble at lower solvent temperatures. The graph shows the solubilities of different solids in water.

  1. How does breaking up a sugar cube that sits on the bottom of a glass of iced tea affect how the sugar dissolves?


    • Unless you stir the tea, breaking up the sugar cube has no effect on how the sugar dissolves.
    • Unless you heat the tea, breaking up the sugar cube has no effect on how the sugar dissolves.
    • Breaking up the sugar cube increases the number of particles and therefore decreases the sugar's solubility.
    • Breaking up the sugar cube increases the sugar's surface area and therefore increases the rate at which it dissolves.
  2. Which variable will increase the rate at which sodium chloride (table salt) dissolves in water?
    • cooling the mixture
    • stirring the mixture
    • using larger pieces of salt
    • changing the solvent to oil

      Directions: Write your answer on a separate sheet of paper.
  3. The data in the graph is based on experimental results. In a paragraph, identify the independent and dependent variables and the control factors in this experiment.

    Questions 4 through 6 refer to the following paragraph and graph.



    If you hold a book in one hand and a comparably sized piece of foam packing material in the other, the book feels heavier. The book feels heavier because it has more mass in the same amount of space. This property of matter is referred to as density. Density is defined as the mass per unit volume of a material. It is an important property—one that, when combined with other properties, helps distinguish one substance from another. In general, gases are less dense that liquids, which are less dense that solids. The bar graph shows the density of some common substances.
  4. which of the following substances is denser than lead?
    • gold
    • iron
    • rust
    • salt
  5. According to the graph, if you melt ice, what is the effect on its density?
    • its density increases.
    • Its density decreases.
    • Its density increases, then decreases.
    • Its density decreases, then increases.
  6. A 50-gram sample of which substance will have the largest volume?
    The ingredients of mixture keep their own properties, and they can be separated from a mixture by physical means as described below.
    • iron
    • lead
    • mercury
    • rust
  7. What happens to the structure of atoms and molecules when a mixture is separated?
    • The atoms and molecules remain in the same combinations before and after a mixture is sorted.
    • The heaviest molecules are unchanged, but lighter molecules can combine to form new substances.
    • The atom and molecules can combine with other atoms to form new substances when a mixture is sorted.
    • The atoms with the smallest diameter stay fixed in place, but larger atoms can combine to form new substances.
  8. What do distillation and extraction have in common?
    • They both involve density.
    • They both involve solutions.
    • They both involve magnetism.
    • They both involve appearance.
  9. petroleum is separated into products such as gasoline and kerosene by heating it to a boiling point and allowing it to cool again. The name of this method is. A dry cleaner used the chemical trichloroethylene to remove a salad dressing stain from a tablecloth. The name of this method is.
Answer:
  1. Breaking up the sugar cube increases the sugar's surface area and therefore increases the rate at which it dissolves.
  2. stirring the mixture
  3. answer depends
  4. gold
  5. its density increases.
  6. The atoms with the smallest diameter stay fixed in place, but larger atoms can combine to form new substances.
  7. The atoms and molecules remain in the same combinations before and after a mixture is sorted.
  8. They both involve solutions.
  9. distillation and extraction







Reference:


Complete Test Preparation for the GED Test 2014 by Steck-Vaughn