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Questions and Answers
What is the chemical formula for the compound formed from the reaction between sodium and sulfur?
What is the chemical formula for the compound formed from the reaction between sodium and sulfur?
What is the chemical name of Na2S?
What is the chemical name of Na2S?
Which of the following molecular shapes corresponds to the Lewis structure for H2O?
Which of the following molecular shapes corresponds to the Lewis structure for H2O?
In which molecule does carbon exhibit a trigonal planar shape?
In which molecule does carbon exhibit a trigonal planar shape?
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How many total valence electrons are present in the molecule CS2?
How many total valence electrons are present in the molecule CS2?
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Which of the following molecules is considered polar?
Which of the following molecules is considered polar?
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What shape does the Lewis structure of CH4 predict?
What shape does the Lewis structure of CH4 predict?
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How many lone pairs are on the central atom in the Lewis structure of PH3?
How many lone pairs are on the central atom in the Lewis structure of PH3?
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What is the density of a substance with 9.95g and 10.00 ml when calculated using its mass and volume?
What is the density of a substance with 9.95g and 10.00 ml when calculated using its mass and volume?
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What is the reasoning behind the prediction that Substance C is most likely water?
What is the reasoning behind the prediction that Substance C is most likely water?
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What type of radioactive decay is potassium-42 most likely to undergo?
What type of radioactive decay is potassium-42 most likely to undergo?
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Which of the following statements accurately describes the mass number of potassium-42?
Which of the following statements accurately describes the mass number of potassium-42?
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In the claim regarding Substance C, what density value indicates it is most likely water?
In the claim regarding Substance C, what density value indicates it is most likely water?
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What decay process is predicted for uranium-238 due to its mass number being greater than 82?
What decay process is predicted for uranium-238 due to its mass number being greater than 82?
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What is the significance of showing work in the density calculations?
What is the significance of showing work in the density calculations?
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Which part of the scientific method does the 'reasoning' in the claim, evidence, reasoning format represent?
Which part of the scientific method does the 'reasoning' in the claim, evidence, reasoning format represent?
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Which element undergoes electron capture because its mass number is lower than its average atomic mass?
Which element undergoes electron capture because its mass number is lower than its average atomic mass?
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How much of a 400 g sample of phosphorus-32 will remain after 71.5 days given its half-life is 14.3 days?
How much of a 400 g sample of phosphorus-32 will remain after 71.5 days given its half-life is 14.3 days?
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What is the half-life of the isotope mentioned in the graph?
What is the half-life of the isotope mentioned in the graph?
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Which rule is NOT part of good graphing practices?
Which rule is NOT part of good graphing practices?
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What is the correct full electron configuration for palladium (Z = 46)?
What is the correct full electron configuration for palladium (Z = 46)?
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Which of these accurately describes the mass behavior of an element with too many neutrons?
Which of these accurately describes the mass behavior of an element with too many neutrons?
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What is the abbreviated electron configuration for lead (Z = 82)?
What is the abbreviated electron configuration for lead (Z = 82)?
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What is the correct name for the compound with the formula N2O5?
What is the correct name for the compound with the formula N2O5?
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What is the correct formula for cobalt(II) hydrogen carbonate?
What is the correct formula for cobalt(II) hydrogen carbonate?
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Which of the following compounds is an acid?
Which of the following compounds is an acid?
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What is the correct name for the compound with the formula Ba(OH)2?
What is the correct name for the compound with the formula Ba(OH)2?
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What is the correct formula for ammonium chromate?
What is the correct formula for ammonium chromate?
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What type of bond is formed when sodium and sulfur react?
What type of bond is formed when sodium and sulfur react?
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What is the chemical formula for the compound formed when sodium and sulfur react?
What is the chemical formula for the compound formed when sodium and sulfur react?
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The reaction between sodium and sulfur results in the formation of which of the following?
The reaction between sodium and sulfur results in the formation of which of the following?
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Study Notes
Free Response Practice Problems - Key Concepts
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Full Credit Requirements: Show all work (formula, calculations, units), round answers to correct significant figures, and box the final answer.
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Partial Credit: Attempt all questions; partial credit is awarded for partial solutions.
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Study Tips: Write down hints for each question as you work through them, use learning targets to guide your study and review videos.
Density Calculations
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Formula: Density (D) = Mass (m) / Volume (V)
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Units: Crucial to show units throughout calculations (e.g., grams for mass, milliliters for volume) and include the correct unit in final answer.
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Significant Figures: Round answers to correct significant figures.
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Example Calculations: Provided tables show how to calculate density, given mass and volume of substances A, B, and C. Substance C has a density closest to water density of 1.00 g/mL, suggesting it's likely water.
Radioactive Decay Prediction
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Unstable Isotopes: All isotopes in the problem are unstable and will undergo radioactive decay.
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Decay Type Prediction: The student must predict the type of radioactive decay (alpha, beta, electron capture) based on the number of neutrons and protons in the nucleus. If the mass number is greater than the average atomic mass, there are too many neutrons and beta decay will likely occur. If the mass number is lower than the average atomic mass, there are too many protons and electron capture will likely occur, if the atomic number is significantly above 82, alpha decay is probable..
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Balanced Nuclear Equations: Students must show a balanced nuclear equation to exemplify the decay process.
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Reasoning: The reasoning should include a discussion of the number of neutrons and protons, and why the predicted decay mode is chosen based on the values.
Half-Life of Radioisotopes
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Time and Mass Relationship: A table relates time (in days) with the mass (in grams) remaining over time for a sample of Phosphorus-32. This shows that the sample exponentially decreases according to the half-life of the substance.
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Finding Remaining Mass: 71.5 days after the start is given, the amount of original mass remaining after that time will be found using information on half-life provided.
Molecular and Ionic Bonding Concepts
- Lewis Structures / Electron Configuration: Palladium (Pd) and Lead (Pb) electron configurations and orbital diagrams are provided, as well as Lewis structures for various compounds and their properties like molecular shape and whether they're polar or nonpolar.
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Description
Test your understanding of density calculations with this quiz focusing on key concepts. You'll be required to demonstrate your problem-solving skills by showing all work, utilizing correct units, and applying significant figures. Brush up on your knowledge of formulas and example calculations to excel in this practice.
