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CSET Chemistry (218) Practice Tests & Test Prep by Exam Edge - Free Test


Our free CSET Chemistry (218) Practice Test was created by experienced educators who designed them to align with the official California Teacher Certification content guidelines. They were built to accurately mirror the real exam's structure, coverage of topics, difficulty, and types of questions.

Upon completing your free practice test, it will be instantly reviewed to give you an idea of your score and potential performance on the actual test. Carefully study your feedback to each question to assess whether your responses were correct or incorrect. This is an effective way to highlight your strengths and weaknesses across different content areas, guiding you on where to concentrate your study efforts for improvement on future tests. Our detailed explanations will provide the information you need to enhance your understanding of the exam content and help you build your knowledge base leading you to better test results.

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CSET Chemistry - Free Test Sample Questions

Beta decay is represented by -10b. It is a high speed electron with no mass and a -1 charge. When radioactive iodine-131 emits a beta particle, what new element is formed?

Correct Answer:
xenon-131


beta decay is a type of radioactive decay where a beta particle is emitted from a nucleus. a beta particle is essentially a high-speed electron with a -1 charge and negligible mass. this process occurs when a neutron in the nucleus transforms into a proton and an electron. the electron is then ejected from the nucleus as the beta particle.

in the case of iodine-131 undergoing beta decay, the emission of the beta particle results in a change within the nucleus: one of its neutrons is converted into a proton. this transformation increases the atomic number of the element by one, while the mass number remains unchanged. the atomic number of iodine is 53, so adding one proton changes the atomic number to 54, which is the atomic number of xenon.

therefore, when iodine-131 emits a beta particle, the new element formed is xenon-131. the mass number stays the same at 131 because the loss of a neutron and the gain of a proton balance out, affecting only the composition of the nucleus in terms of its proton count, not its overall mass. hence, xenon-131 is the product of this radioactive decay process.