Questions and Answers
Of the following, only ____ is a chemical equation.
Of the following, ____ is the largest mass.
Write the chemical formula for an ionic compound formed from K+ and N-3.
K3N
Write the chemical formula for an ionic compound formed from Ca+2 and F-.
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Write the chemical formula for an ionic compound formed from Fe+3 and S-2.
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Which formula/name pair is incorrect?
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The name of PCl3 is:
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In the Rutherford nuclear-atom model,
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Which compounds do not have the same empirical formula?
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There are ____ electrons, ____ protons, and ____ neutrons in an atom of 132Xe.
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Isotopes are atoms that have the same number of _____ but differing number of _____.
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Which pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties?
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What is the name of Group 1A?
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What is the name of Group 2A?
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What is the name of Group 7A?
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What is the name of Group 8A?
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Which one of the following molecular formulas is also an empirical formula?
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Which species has 18 electrons?
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Which formula/name pair is incorrect?
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Barium reacts with a polyatomic ion to form a compound with the formula Ba3(X)2. What would be the most likely formula for the compound formed between sodium and the polyatomic ion X?
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The name of the binary compound N2O4 is ____.
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One mole of ____ contains the smallest number of atoms.
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Study Notes
Chemical Reactions and Equations
- Tarnishing of silver is classified as a chemical equation, showcasing a chemical change.
- Other options (melting, dissolving, crushing, dropping) describe physical changes.
Mass Comparison
- Among the listed items, 25 kg represents the largest mass, significantly greater than the other smaller measurements in milligrams or picograms.
Ionic Compound Formation
- Chemical formulas for ionic compounds:
- K⁺ and N³⁻ yield K₃N.
- Ca²⁺ and F⁻ yield CaF₂.
- Fe³⁺ and S²⁻ yield Fe₂S₃.
Incorrect Formula/Name Pair Identification
- Fe₂(SO₄)₃ is incorrectly named as iron (III) sulfide; the correct name should be iron (III) sulfate.
Naming Compounds
- PCl₃ is correctly named phosphorus trichloride.
Rutherford Nuclear Atom Model
- Protons and neutrons, the heavy subatomic particles, reside in the nucleus of the atom.
Empirical Formula Comparison
- CO and CO₂ do not share the same empirical formula, demonstrating different molecular compositions.
Atom Composition
- An atom of ¹³²Xe contains 54 electrons, 54 protons, and 78 neutrons.
Isotope Definition
- Isotopes are defined by having the same number of protons but varying numbers of neutrons.
Element Similarities
- Calcium (Ca) and Strontium (Sr) exhibit the greatest similarity in physical and chemical properties due to being in the same group of the periodic table.
Group Names in the Periodic Table
- Group 1A elements are known as alkali metals.
- Group 2A elements are referred to as alkaline earth metals.
- Group 7A elements are the halogens.
- Group 8A elements are called noble gases.
Empirical and Molecular Formula Analysis
- C₂H₆SO qualifies as both a molecular and empirical formula.
Electron Count in Ions
- The species ³²S²⁻ possesses 18 electrons.
Incorrect Pair Identification in Compounds
- The compound Mg₃N₂ is incorrectly referred to as magnesium nitrite; the correct term is magnesium nitride.
Compounds and Polyatomic Ions
- Sodium reacts with a polyatomic ion X to form a compound represented by the formula Na₃X.
Naming Binary Compounds
- N₂O₄ is officially named dinitrogen tetroxide, indicating the number of nitrogen and oxygen atoms in the molecule.
Atom Count in Moles
- One mole of NaCl contains the fewest atoms (1 Na atom + 1 Cl atom), compared to larger molecules like S₈ or Al₂(SO₄)₃.
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Description
Test your knowledge on chemical reactions, ionic compounds, and the correct naming conventions of compounds. This quiz covers topics such as tarnishing, comparisons of mass, and the Rutherford model of the atom. Challenge yourself and see how well you understand these foundational concepts in chemistry!
