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Questions and Answers
What is the formula of the iodate ion?
What is the name of (NH4)2HPO3?
What is a medical use of AgNO3?
What is the formula of bromous acid?
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What is the ground state electron configuration of the most stable ion that Rb forms?
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What is the electron configuration for the most stable ion formed by I?
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Which of these molecules is nonpolar?
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Which pair of chemical formulas represents ionic compounds?
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What is the most stable ion that barium-138 can form?
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Which formula is correct for an ionic compound formed from lead and sulfur?
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What is the correct molecular geometry of CH2O?
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Which statement is true about the CH3Cl molecule?
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What is the molecular formula for hydrogen fluoride in gaseous form?
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What is the correct name for the compound with the formula O2F2?
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Calculate the formula weight of Cr2(SO3)3.
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Which of the following statements about nonpolar molecules is correct?
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In the reaction Cu2+(aq) + Zn(s) → Cu(s) + Zn2+(g), which statement is true regarding the roles of the substances involved?
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What is the limiting reactant when 31.8 g of H2(g) is combined with 127.1 g of NO(g) in the reaction 2 H2(g) + 2 NO(g) → N2(g) + 2 H2O(g)?
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What is the percent yield if 31.8 g of H2(g) reacts with 127.1 g of NO(g) to produce 22.8 g of N2(g)?
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How much mass of H2(g) in grams is required to produce 220.6 g of N2(g) in the reaction 2 H2(g) + 2 NO(g) → N2(g) + 2 H2O(g)?
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Which statement correctly summarizes the thermochemical reaction Fe2O3(s) + 196.5 kcal → 2 Fe(s) + 3/2 O2(g)?
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How does fluoride ion help in preventing tooth decay?
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Which of the following molecular geometries is likely formed by the NO molecule based on its electron configuration?
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Which characteristic distinguishes ionic compounds from covalent compounds?
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Study Notes
Chemical Formulas and Nomenclature
- The iodate ion has the formula IO3-.
- The name of (NH4)2HPO3 is ammonium hydrogenphosphite.
- AgNO3 is used medically as an antibiotic.
- Bromous acid has the formula HBrO2.
Electron Configuration
- The ground state electron configuration of the most stable ion that Rb forms is [Kr]5s24d105p6.
- The ground state electron configuration of the most stable ion that I forms is [Kr]5s24d105p6.
Atomic Structure and Isotopes
- Barium-138 forms a stable ion with 56 protons, 54 electrons and 82 neutrons.
- Phosphorus-31 forms a stable ion with 15 protons, 18 electrons and 16 neutrons.
Chemical Compounds
- Hydrogen fluoride is represented by the formula HF(g).
- The name of O2F2 is dioxygen difluoride.
- Chromium(VI) carbonate has the formula Cr(CO3)3.
Molecular Geometry and Polarity
- The CH2O molecule has a trigonal planar shape around the central atom with an approximate bond angle of 120.0 degrees. It contains polar bonds.
- The correct Lewis structure for CH3Cl shows the carbon atom with three single bonds and one single bond. It is a polar molecule with a tetrahedral shape and an HCH bond angle of approximately 109.5 degrees.
- C2F4 is a nonpolar molecule with polar bonds.
Formula Weight and Stoichiometry
- The formula weight of Cr2(SO3)3 is 392.21 amu.
- 0.315 mol of Cr2(SO3)3 corresponds to 124 g of Cr2(SO3)3.
- 7.02 x 10^22 formula units of Cr2(SO3)3 contain 3.75 g of sulfur.
Balancing Chemical Equations
- The balanced equation for the combustion of C7H14 is 2C7H14 + 21O2 → 14CO2 + 14H2O.
Redox Reactions
- In the reaction Cu2+(aq) + Zn(s) → Cu(s) + Zn2+(g), Zn(s) is oxidized and is the reducing agent, while Cu2+(aq) is reduced and is the oxidizing agent.
Limiting Reactant and Percent Yield
- In the reaction 2 H2(g) + 2 NO(g) → N2(g) + 2 H2O(g), with 31.8 g of H2(g) and 127.1 g of NO(g) reacting to produce 22.8 g of N2(g), the limiting reactant is NO.
- The percent yield for the reaction is 61.6%.
- To form 220.6 g of N2(g), 31.8 g of H2(g) is required.
Thermochemical Equations
- The production of 156.0 g of iron according to the thermochemical equation Fe2O3(s) + 196.5 kcal → 2 Fe(s) + 3/2 O2(g) consumes 548.9 kcal of energy and is an endothermic reaction.
Fluoride and Tooth Enamel
- Fluoride ions replace hydroxide ions in hydroxyapatite, forming the less acid soluble fluoroapatite, thereby protecting the enamel against tooth decay.
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Description
Test your knowledge on chemical formulas, nomenclature, electron configurations, atomic structure, and molecular geometry. This quiz covers various aspects of chemistry, including the naming of compounds and the properties of ions. Perfect for chemistry students looking to reinforce their understanding.
