The amount of time it takes for half the nuclei in a sample of the isotope to decay

The amount of time it takes for some of the nuclei in a sample of the isotope to decay

The amount of time it takes for half the electrons in a sample of the isotope to decay

the amount of time it takes to double the nuclei in a sample of the isotope to decay

Half life practice problems

Quiz

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Chemistry, Physics

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KG - University

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Practice Problem

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Medium

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NGSS.HS-PS1-8, CCSS.HSF.LE.A.4, NGSS.HS-PS4-4

Standards-aligned

Used 3K+ times

FREE Resource

About this resource

This quiz comprehensively covers nuclear chemistry and radioactivity concepts appropriate for high school chemistry students, typically grades 10-12. The assessment focuses on half-life calculations, nuclear decay processes, types of radiation, and fundamental nuclear reactions. Students need a solid foundation in exponential decay mathematics, understanding that each half-life period reduces a radioactive sample by exactly half. They must master the relationship between elapsed time and remaining sample amounts, requiring skills in fraction manipulation and percentage calculations. The quiz also demands knowledge of atomic structure, specifically distinguishing between protons, neutrons, and electrons, along with understanding how nuclear changes affect atomic identity. Students need to recognize the three main types of radiation (alpha, beta, gamma), their properties and penetrating abilities, and comprehend nuclear processes including fission, fusion, and chain reactions. Mathematical problem-solving skills are essential for multi-step half-life calculations spanning several decay periods. This quiz was created by a classroom teacher who designed it for students studying nuclear chemistry and radioactivity in grades 10-12. The assessment serves multiple instructional purposes, functioning effectively as formative assessment to gauge student understanding before major tests, or as structured practice following initial instruction on nuclear concepts. Teachers can implement this as a warm-up activity to review previously taught material, assign it for homework to reinforce classroom learning, or use it during review sessions before unit examinations. The combination of conceptual questions and computational problems makes it valuable for identifying students who need additional support with either mathematical applications or fundamental nuclear chemistry principles. This quiz aligns with NGSS standards HS-PS1-8 (nuclear processes and radioactive decay) and supports Common Core mathematical practices through its emphasis on problem-solving and mathematical modeling in scientific contexts.

Half life practice problems

18 questions

What is Half-life?

The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?

After the third half-life, how much of the sample is left?

The half life of iodine-131 is 8.040 days. What percentage of an iodine-131 sample will remain after 40.20 days?

Barium-122 has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10 minutes to set up an experiment using barium-122, how much barium-122 will be left when the experiment begins?

The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?

How many protons does U 235 atom have ?

The radiation detected from a piece of rock is reduced significantly when the rock is wrapped in foil. What type of radiation is being emitted?

The beta particle has a charge of ...........

Uranium-238 decays into Thorium-234 by emitting .........

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