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Massachusetts Comprehensive Assessment System

2011, High School Chemistry

  Question 23: Open-Response  
Radium-223 is part of a radioactive decay series that gives off alpha, beta, and gamma radiation.
  1. Identify the charges on alpha radiation, beta radiation, and gamma radiation.
A sample of radium-223 is placed in a lead block and the emitted radiation passes between charged plates, as shown below.
The diagram has a box labeled 'lead block containing sample' that has a round opening on the right with many dotted lines labeled 'emitted radiation' drawn from the opening to the entrance of the charged plates. The charged plates are represented by two parallel lines; the positively charged plate is above the negatively charged plate with an opening in between.
  1. Describe the path of each type of radiation as it passes between the charged plates.
If several sheets of aluminum are placed in the path of the radiation emitted from the sample of radium-223, as shown below, some radiation would be blocked.
The diagram has a box labeled 'lead block containing sample' that has a round opening on the right with many dotted lines labeled 'emitted radiation' drawn from the opening to a vertical black line labeled 'aluminum sheets.' A few of the dotted lines continue on the other side of the vertical black line.
  1. Identify which type of radiation the aluminum sheets would least likely block. Explain your answer.

Scoring Guide and Sample Student Work
Select a score point in the table below to view the sample student response.

ScoreDescription
4 The response demonstrates a thorough understanding of the types of radiation emitted during radioactive decay and their properties. The response correctly identifies the charge on each type of radiation. The response correctly describes the paths of each type of radiation between charged plates. The response also identifies which type of radiation would be least likely blocked by aluminum sheets and explains why.
4
3
The response demonstrates a general understanding of the types of radiation emitted during radioactive decay and their properties.
2
The response demonstrates a limited understanding of the types of radiation emitted during radioactive decay and their properties.
1
The response demonstrates a minimal understanding of the types of radiation emitted during radioactive decay and their properties.
0
The response is incorrect or contains some correct work that is irrelevant to the skill or concept being measured.

Note: There are 2 sample student responses for Score Point 4.

High School Chemistry

Question 11: Solutions, Equilibrium, and Acid-Base Theory
Question 23: Atomic Structure and Periodicity
Question 33: Atomic Structure and Periodicity
Question 44: Properties of Matter and Thermochemistry
Question 45: Bonding and Reactions

Return to the MCAS 2011 Student Work Directory



Last Updated: April 27, 2016
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