Radioactive Decay and Half-Life Quiz
20 Questions
4 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Explain the difference between an isotope and a radioisotope.

An isotope is an atom of an element with the same number of protons but a different number of neutrons. A radioisotope is an isotope that is radioactive.

Calculation the value of a 100g sample of a radioactive substance has a half-life of 5 years. How much of the substance remains radioactive after 15 years? Answer: 12.5g

12.5g

What is the time it takes for half of a radioactive sample to decay?

Half-life

The original radioactive material before decay.

<p>Parent material</p> Signup and view all the answers

The stable material formed after radioactive decay.

<p>Daughter material</p> Signup and view all the answers

A type of radioactive decay where an alpha particle is emitted, reducing the atomic number by 2 and mass number by 4.

<p>Alpha decay</p> Signup and view all the answers

After 2 trials in the M&M lab, 25 M&M's remain. If each trial represents one half-life, how many M&M's would be present after 5 half-lives?

<p>1.5625</p> Signup and view all the answers

Explain this graph.

<p>The graph shows the decay of a radioactive substance over time. The half-life of the substance is the time it takes for half of the substance to decay. The graph shows that the amount of the substance remaining decreases exponentially over time, with each half-life resulting in half of the remaining substance decaying.</p> Signup and view all the answers

Based on the graph estimate the half-life of Mercury 203.

<p>The half-life of Mercury 203 is approximately 47 days.</p> Signup and view all the answers

If each trial represents 4.2 years, what is the half-life of the red M&M's?

<p>4.2 years</p> Signup and view all the answers

Suppose you start with 100 grams of red M&M's. How much remains after 12.6 years? Answer: 5 grams.

<p>5 grams</p> Signup and view all the answers

Describe the relationship between the parent material and the daughter material over time. Answer: As the parent material decreases due to radioactive decay, the daughter material increases proportionally.

<p>As the parent material decreases due to radioactive decay, the daughter material increases proportionally.</p> Signup and view all the answers

The half-life of radium-222 is 38 seconds. If you have a 12-gram sample, how much remains after 114 seconds? Answer: 1.5 grams.

<p>1.5 grams</p> Signup and view all the answers

Matter cannot be created or destroyed in a chemical reaction. Therefore, the number of each type of atom must be the same on both sides of a chemical equation.

<p>Law of Conservation of Mass</p> Signup and view all the answers

Substances on the left side of the equation are reactants, and those on the right side are products.

<p>Reactants and Products</p> Signup and view all the answers

Numbers placed before compounds to balance the equation.

<p>Coefficients</p> Signup and view all the answers

Elements that exist as two atoms bonded together in their natural form (e.g., H2, O2, N2).

<p>Diatomic molecules</p> Signup and view all the answers

Compounds composed of two different elements (e.g., NaCl, H2O).

<p>Binary compounds</p> Signup and view all the answers

Write the unbalanced equation.

<p>Step 1: Write the unbalanced equation</p> Signup and view all the answers

Count the number of atoms of each element on both sides.

<p>Step 2: Count the number of atoms of each element on both sides</p> Signup and view all the answers

Study Notes

Radioactive Decay and Half-Life

  • Half-life: The time it takes for half of a radioactive sample to decay.
  • Radioactive Decay: Decay where an unstable atomic nucleus loses energy by emitting particles.
  • Parent Material: The original radioactive substance.
  • Daughter Material: The stable substance formed by the decay.
  • Alpha Decay: A type of radioactive decay where an alpha particle (a helium nucleus) is emitted.
    • This reduces the atomic number by 2.
    • This reduces the mass number by 4.

Radioactive Decay Calculations

  • Example: A 100g sample of a radioactive substance with a 5-year half-life.
    • After 5 years, 50g remains radioactive.
    • After 10 years, 25g remains radioactive.
    • After 15 years, 12.5g remains radioactive.

Isotopes and Radioisotopes

  • Isotopes: Atoms of the same element with different numbers of neutrons.
  • Radioisotopes: Isotopes that are radioactive.

Graphing Radioactive Decay

  • Graphs of radioactive decay show an exponential decrease in the amount of radioactive material over time.

M&M Example

  • Half-life: 4.2 years based on given experiment data.
  • Starting Quantity: 100 grams of M&M's
  • Remaining after 12.6 years: 5 grams

Chemical Equations

Balancing Equations

  • Law of Conservation of Mass: Matter cannot be created or destroyed in a chemical reaction.
  • The number of each type of atom is the same on both sides of a balanced chemical equation.
  • Reactants: Substances on the left side of the equation.
  • Products: Substances on the right side of the equation.
  • Coefficients: Numbers placed before compounds to balance the equation.

Diatomic Molecules

  • Elements that exist as two atoms bonded together in their natural form (example: H2, O2, N2).

Binary Compounds

  • Compounds composed of two different elements (example: NaCl, H2O).

Steps to Balance Equations

  • Write the unbalanced equation.
  • Count the number of atoms of each element on both sides.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

Description

Test your knowledge on radioactive decay and half-life concepts. This quiz covers terms such as isotopes, radioisotopes, and calculations related to half-lives. Challenge yourself with questions on alpha decay and graphing radioactive decay.

More Like This

Radioactive Decay and Half-Life
31 questions

Radioactive Decay and Half-Life

GloriousRhodochrosite avatar
GloriousRhodochrosite
Radioactive Decay and Half-Life Concepts
18 questions
Half-Life Concepts and Applications
5 questions
Radioactive Decay and Isotopes Quiz
14 questions

Radioactive Decay and Isotopes Quiz

ExhilaratingChrysoprase8468 avatar
ExhilaratingChrysoprase8468
Use Quizgecko on...
Browser
Browser