Item SC069007: When a chemical reaction occurs, the characteristic properties of the products are different than the characteristic properties of the reactants. (This item used a table to show the properties of the substances.)

A student determines the density, solubility, and boiling point of two liquids, Liquid 1 and Liquid 2. Then he stirs the two liquids together and heats them. After stirring and heating the liquids, two different liquids form, Liquid 3 and Liquid 4. Then the student determines the density, solubility, and boiling point of Liquids 3 and 4. He concludes that a chemical reaction occurred. Here are his results:

  Density (g/mL) Soluble in Water Boiling Point (°C)
 
Before stirring and heating Liquid 1 0.96 Yes 164
Liquid 2 0.81 Yes 118
 
After stirring and heating Liquid 3 0.87 Yes 166
Liquid 4 1.00 Yes 100

How does the student know that a chemical reaction has occurred?

  1. The student knows that a chemical reaction has occurred because
    Liquid 3 has different properties than Liquid 4.
  2. The student knows that a chemical reaction has occurred because
    Liquid 1 has different properties than Liquid 2.
  3. The student knows that a chemical reaction has occurred because
    Liquids 3 and 4 have different properties than Liquids 1 and 2.
  4. The student knows that a chemical reaction has occurred because
    a chemical reaction always occurs when two liquids are mixed together.
(Modified from IQWST)
Distribution of Responses
Chart showing distrubtion of responses for Item SC069007
Students Responding Correctly
Group Correct Total Percent
Overall 4783 7851 61%
Grades
  6–8 1846 3339 55%
  9–12 2913 4465 65%
Gender
  Male2313374162%
  Female2363393460%
Primary Language
  English4251687862%
  Other38976051%

View data table