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Questions and Answers
What is Hess's Law related to?
What is Hess's Law related to?
- The enthalpy change of a reaction (correct)
- The atomic number of an element
- The heat of formation of a compound
- The mass of a compound
What is unique to every compound?
What is unique to every compound?
- Its heat of formation
- Its atomic number
- Its own heat of formation (correct)
- Its enthalpy change
What does the heat of formation of a compound represent?
What does the heat of formation of a compound represent?
- The energy required to melt a compound
- The energy released when a bond is formed
- The energy required to break a bond
- The energy required to form a compound (correct)
What is the significance of Hess's Law?
What is the significance of Hess's Law?
What is the unit of heat of formation?
What is the unit of heat of formation?
What is the relationship between the enthalpy change of a reaction and the number of steps involved?
What is the relationship between the enthalpy change of a reaction and the number of steps involved?
What is the probable decay process of 234 into 230?
What is the probable decay process of 234 into 230?
What is the resulting element when Uranium (92) decays into?
What is the resulting element when Uranium (92) decays into?
What type of reaction occurs in an electrolytic cell?
What type of reaction occurs in an electrolytic cell?
What is true about light elements with even numbers of protons and neutrons?
What is true about light elements with even numbers of protons and neutrons?
What is the atomic number of Uranium?
What is the atomic number of Uranium?
What is the charge of the Zn ion in the reaction?
What is the charge of the Zn ion in the reaction?
What is the atomic number of Thorium?
What is the atomic number of Thorium?
What happens to the Zn atom during the reaction?
What happens to the Zn atom during the reaction?
What is the type of radiation emitted when a nucleus emits a positron?
What is the type of radiation emitted when a nucleus emits a positron?
What is the role of atom C in the reaction?
What is the role of atom C in the reaction?
What is the symbol of the element with atomic number 4?
What is the symbol of the element with atomic number 4?
What is the result of the reaction on the Cu atom?
What is the result of the reaction on the Cu atom?
What is the direction of electron flow in the reaction?
What is the direction of electron flow in the reaction?
What is the lecture topic of the given content?
What is the lecture topic of the given content?
What is the purpose of a bomb calorimeter?
What is the purpose of a bomb calorimeter?
What happens to energy during energy transfer or transformation?
What happens to energy during energy transfer or transformation?
What is the result of energy loss as heat?
What is the result of energy loss as heat?
What is the context in which the heat emitted by a sample is measured?
What is the context in which the heat emitted by a sample is measured?
What is the study of the relationships between heat, work, and energy?
What is the study of the relationships between heat, work, and energy?
What is the lecture series about?
What is the lecture series about?
What is the half-life of Iodine-131?
What is the half-life of Iodine-131?
How many grams of Iodine-131 will remain after 16 days if you start with 200 grams?
How many grams of Iodine-131 will remain after 16 days if you start with 200 grams?
What type of decay is K-42 related to?
What type of decay is K-42 related to?
What is the result of 2 half-lives of Iodine-131 decay?
What is the result of 2 half-lives of Iodine-131 decay?
What is the purpose of a decay equation?
What is the purpose of a decay equation?
How many half-lives are required for 200 grams of Iodine-131 to decay to 25 grams?
How many half-lives are required for 200 grams of Iodine-131 to decay to 25 grams?
What is the result of 4 half-lives of Iodine-131 decay?
What is the result of 4 half-lives of Iodine-131 decay?
How long will it take for 200 grams of Iodine-131 to decay to 12.5 grams?
How long will it take for 200 grams of Iodine-131 to decay to 12.5 grams?
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Study Notes
Heat Formation and Bomb Calorimeter
- Every compound has its own heat of formation
- A bomb calorimeter is used to measure the heat emitted by a sample burned under controlled conditions
Hess's Law
- States that the enthalpy change of a reaction is the same, regardless of whether it occurs in one step or a series of steps
- Energy transfer or transformation leads to an overall increase in entropy, with some energy lost as heat
Redox Reaction and Electrolytic Cells
- Example of a redox reaction: Zn (2+) will be an ion, while Cu will be neutral
- Zn gradually deteriorates, while Cu grows larger during the reaction
Radioactive Decay
- 234U decays via alpha emission, then positron decay
- If the number of protons and neutrons in light elements are even, they are stable
- Heavy elements (83 and above) are unstable and undergo radioactive decay
- Intermediate elements (21-82) are also unstable
Half-Life of Iodine-131
- Iodine-131 has a half-life of 8 days
- If there are 200 grams of Iodine-131, after 32 days, 25 grams will remain
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