NUCLEAR CHEMISTRY OBJECTIVE: TO EXPLAIN THE PROCESS OF RADIOACTIVE DECAY USING NUCLEAR EQUATIONS AND HALF LIFE Essential Question: How do unstable (radioactive)

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NUCLEAR CHEMISTRY OBJECTIVE: TO EXPLAIN THE PROCESS OF RADIOACTIVE DECAY USING NUCLEAR EQUATIONS AND HALF LIFE Essential Question: How do unstable (radioactive) isotopes become stable?

Radioactivity introduction - Radioactivity video – 4 minutes unexpected-steve-weatherall unexpected-steve-weatherall Review questions: unexpected-steve-weatherall#review unexpected-steve-weatherall#review Dig deeper: unexpected-steve-weatherall#digdeeper unexpected-steve-weatherall#digdeeper

Review: Radioactive Isotopes A radioactive isotope has an unstable nucleus that undergoes spontaneous changes. - Emits particles Emits energy in the form of __________ waves. - Transmutates into another element

Nuclear Chemistry Atomic nucleus: compared to the whole atom (also called the nuclide) Mass: Energy Volume Student notes

Strong Nuclear Force: Holds the nucleus together Limit to the # neutrons: A nucleus with too many neutrons will be unstable and change

Nuclear Chemistry Most atoms have tremendously stable nucleus Exist for billions of years A radioactive isotope has an unstable nucleus which undergoes spontaneous changes. Note: spontaneous change ⇏ fast change Transmutates into another element The nucleus changes (different number of protons): Emits particles and energy: Unstable isotopes are changing to become stable Student notes

Types of Radiation Understand the following slides on radiation emissions to complete the table in your notes.

Alpha Decay

Beta decay

Gamma Decay

Particles emitted from a radioactive isotope Type Symbol Charge Mass Rad.Strength Next slide

Penetrating ability of different particles: Radition strength: how each of the radioactive emissions are blocked. Which is the most damaging (strongest)?

Nuclear reactions Represents the nuclear changes Use symbols to represent The isotope before and after the change The particles which are emitted Before and after must balance

Balancing Nuclear Reactions Student notes: Totals number of atomic numbers (A ) and total mass numbers (Z) must be the same before and after the reaction. Keep track of atomic number (Z) and mass number (A): protons & neutrons Shown by “Before” “ After”

Nuclear reactions Student notes Total number of atomic numbers and the total mass numbers must be equal on both sides of the equation. Examples:

Nuclear Equations U  Th + ? C  0 -1 e + ? Pu He  Nuclear Equations Practice Website

Nuclear Reactions Emission of Alpha or Beta particles

Radioactive decay Student notes: No two radioactive isotopes decay at the same rate. Therefore, decay rate can be used to identify the isotope. Decay is measured by half life.

Half-life Measure of Radioactive decay rate. Measured as the time it takes for ½ of a sample of radioisotope’s nuclei to decay into its products.

Half Life Decay of a radioisotope Number of Half-Lives Elapsed timeAmount remaining g 11.5 year50 g 23 years25 g years12.5 g

Examples of the Half Life of Radioactive Elements

Tearing Through a Half Life 800 Billion Bismuth-210 Atoms Time (years)

Half Life: game game Number of years Number of radioactive isotopes

Fission and Fusion

Half life Calculations How much of a 100g sample of an unstable isotope remains after 25 years if the half life is 5 years? Determine how many “half life intervals”. Calculate the amount of original sample remaining after each ½ life 100g Simplify the calculations

Half Life Problems How much of a 100g sample of an unstable isotope remains after 25 years if the half life is 5 years? 3.1 g

Half Life Problems How much of a 60g sample of an unstable isotope remains after 2 days if the half life is 12 hours? 7.5 g

Half Life Problems How much of a 20 g sample of an unstable isotope remains after 3 sec if the half life is 0.5 seconds?

Fission and Fusion

ORIGINS OF ELEMENT Reading Analysis:

Teachers' Domain: The Origin of the Elements

Teachers' Domain: The Elements: Forged in Stars

Got Calcium Where are most elements created? When was H and He created? What elements are made by small stars? What additional elements are made by large stars? What elements are made by supernovae (large exploding stars)?