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SC.8.P.9.2


Differentiate between physical changes and chemical changes.

Subject Area: Science
Grade: 8
Body of Knowledge: Physical Science
Big Idea: Changes in Matter - A. Matter can undergo a variety of changes.

B. When matter is changed physically, generally no changes occur in the structure of the atoms or molecules composing the matter.

C. When matter changes chemically, a rearrangement of bonds between the atoms occurs. This results in new substances with new properties.

Clarification for grades K-5: The target understanding for students in the elementary grades should focus on Big Ideas A and B.

Clarification for Grades 6-8: The target understanding for students in the middle grades should begin to transition the focus to: C. When matter changes chemically, a rearrangement of bonds between the atoms occurs. This results in new substances with new properties.

Date Adopted or Revised: 02/08
Date of Last Rating: 05/08
Status: State Board Approved
Assessed: Yes

TEST ITEM SPECIFICATIONS

  • Reporting Category: Physical Science
  • Item Type(s): This benchmark will be assessed using: MC item(s)
    Also Assesses
    SC.8.P.9.1
    Explore the Law of Conservation of Mass by demonstrating and concluding that mass is conserved when substances undergo physical and chemical changes.

    SC.8.P.9.3 Investigate and describe how temperature influences chemical changes.

  • Clarification :
    Students will differentiate between physical and chemical changes.

    Students will explain that mass is conserved when substances undergo physical and chemical changes, according to the Law of Conservation of Mass.

    Students will describe how temperature influences chemical changes.
  • Content Limits :
    Items will not require balancing equations or analysis of chemical formulas.

    Items will focus on a conceptual understanding of the Law of Conservation of Mass; items will not require mathematical computations.

    Items will not assess reaction rates.
  • Stimulus Attributes :
    Temperature will only be shown in degrees Celsius (°C).
  • Response Attributes :
    Temperature will only be shown in degrees Celsius (°C).
  • Prior Knowledge :
    Items may require the student to apply science knowledge described in the NGSSS from lower grades. This benchmark requires prerequisite knowledge from SC.4.P.9.1 and SC.5.P.9.1.

SAMPLE TEST ITEMS (1)

  • Test Item #: Sample Item 1
  • Question: When a candle is lit, the wick burns, the wax melts, the candle changes shape, and the air around the candle heats up. Which of the following is an example of a chemical change?
  • Difficulty: N/A
  • Type: MC: Multiple Choice