Benchmark 4 review day 2- Unit 10 Nuclear chem

Thursday 5/12- Benchmark review- Unit 11

Announcements/Reminders

Agenda:

​

• Bring headphones/ear buds to class every day!

• Monday 5/16 Benchmark 4 test​

• 5/20 & 5/24- testing days, no school​

• Final exam- 5/25&5/26

• Last day of school 6/2​

• 9 school days until final exam!​

• ​Unit 10-LeChatelier's principle

• ​Unit 11 review

Bellwork: ​​

​Concentration increase shift away from increase

• Concentration decrease shift toward decrease

• 🡹 pressure shifts in direction of fewer gas molecules.

• 🡻 pressure shifts in direction of more gas molecules

• 🡹 temperature favors endothermic reaction

  • Shift away from heat

• 🡻 temperature favors exothermic reaction

  • Shift towards heat

​Equilibrium shifts due to stresses:

​Example- The Haber process (making ammonia NH₃)

​N2 (g) + 3 H2 (g) ⮀ 2 NH3 (g) + heat

1. 🡹 [N2]

2. 🡻 [H2]

3. 🡹 [NH3]

4. 🡻 [NH3]

5. 🡹 pressure

6. 🡻 pressure

7. 🡹 temperature

8. 🡻 temperature

Multiple Choice

Le Chaltelier's Principle states that if a chemical system at equilibrium is stressed,

• the system will adjust to increase the stress
• the system will adjust to reduce the stress
• the system will not adjust

Multiple Choice

(🡹 pressure shifts in direction of fewer gas molecules)

(🡻 pressure shifts in direction of more gas molecules )

N₂(g) + 3H₂(g) ↔ 2 NH₃(g) + heat

Increasing the pressure will cause the equilibrium to:

• Shift right

• Shift left

• Have no change

• Speed up

Multiple Choice

🡹 temperature favors endothermic reaction Shift away from heat 🡻 temperature favors exothermic reaction Shift towards heat

N₂(g) + 3H₂(g) ↔ 2 NH₃(g) + heat

Increasing the temperature will cause the equilibrium to:

• Shift right

• Shift left

• Have no change

• Speed up

Multiple Choice

(Concentration increase shift away from increase)

(Concentration decrease shift toward decrease)

N₂(g) + 3H₂(g) ↔ 2 NH₃(g) + heat

Decreasing H₂ will cause the equilibrium to:

• Shift right

• Shift left

• Have no change

• Speed up

Multiple Choice

(Concentration increase shift away from increase)

(Concentration decrease shift toward decrease)

N₂(g) + 3H₂(g) ↔ 2 NH₃(g) + heat

Removing N₂ will cause the equilibrium to:

• Shift right

• Shift left

• Have no change

• Speed up

Multiple Choice

(Concentration increase shift away from increase)

(Concentration decrease shift toward decrease)

N₂(g) + 3H₂(g) ↔ 2 NH₃(g) + heat

Increasing H₂ will cause the equilibrium to:

• Shift right

• Shift left

• Have no change

• Speed up

Multiple Choice

For the reaction...
SO_2(g) + O_2(g) <−>  SO_3(g)
If the concentration of SO_2(g)  is increased, the equilibrium of the reaction will ___________.

• shift to the left
• shift to the right
• not shift

Multiple Choice

For the reaction...
SO_2(g) + O_2(g) <−>  SO_3(g)
If the concentration of SO_2(g)  is increased, the equilibrium of the reaction will ___________.

• shift to the left
• shift to the right
• not shift

Unit 11 objectives: 

•   identify the types of nuclear decay (alpha, beta, gamma)

• explain what is meant by transmutation

• balance nuclear reactions involved the three types of radiation

• describe the basic concepts of half-life.

• describe the characteristics of radioactive materials.

• define fission and fusion, and describe the differences between the two types of nuclear reactions.

• describe the use of the equation E = mc2 with respect to nuclear reactions.

• describe the basic concepts behind nuclear reactors and discuss the differences of nuclear bombs and reactors.

• describe the use of nuclear materials in medicine.

​Key Terms

1. alpha radiation

2. beta radiation

3. gamma radiation

4. nuclear fission

5. nuclear fusion

6. mass defect​

7. natural transmutation

8. artificial transmutation

9. radiation

10. half-life- definition and calculations

11. radiative dating

12. uses of nuclear chemistry

13. Risks and benefits

Multiple Choice

radiation detector that makes use of a gas-filled metal tube

• scintillation counter

• Geiger counter

• neutron moderation

• neutron absorption

• film badge

​Some text here about the topic of discussion.

​Uranium decay series

​

Multiple Choice

The Law of Conservation of Mass is not always followed with nuclear reactions.

• True
• False

Multiple Choice

What type of particle is being illustrated in following picture? 

• gamma ray
• alpha particle 

Multiple Choice

What is Half-life?

• 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 for half the nuclei 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

Multiple Choice

If 10 mg of iodine 131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.

• 1.25mg
• 1.25g
• 10g
• 10mg

Multiple Choice

If the half-life of uranium-232 is 70 years, how many half-lives will it take for 10 g of it to be reduced to 1.25 g?

• 1 half-life
• 2 half-lives
• 3 half-lives
• 4 half-lives

Multiple Choice

The % of the parent isotope remaining after 1 Half Life.

• 50%

• 25%

• 12.5%

• 6.25%

Multiple Choice

After 4 half-lives, 1g of a sample of Krypton-85 remains unchanged.  What was the original mass of the sample?

• 16g
• 32g
• 0.0625g
• 4g

Multiple Choice

The half life of Krypton-85 is 10.76 year.s After 43 years, 2g of Krypton-85 remains unchanged.  What was the original mass of the sample?

• 16g
• 32g
• 0.0625g
• 4g

Let's practice!

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Some text here about the topic of discussion