Podcast
Questions and Answers
Which of the following correctly represents the balanced chemical equation for the formation of water from hydrogen and oxygen?
Which of the following correctly represents the balanced chemical equation for the formation of water from hydrogen and oxygen?
- 2H₂ + O₂ → 2H₂O (correct)
- 2H + O → H₂O
- H₂ + 2O₂ → 2H₂O
- H₂ + O₂ → H₂O
What is the correct Lewis structure representation for carbon dioxide (CO₂)?
What is the correct Lewis structure representation for carbon dioxide (CO₂)?
- O≡C-O
- O=C=O (correct)
- O-C-O
- O=C≡O
What is the chemical formula for the ionic compound formed between calcium (Ca²⁺) and phosphide (P³⁻)?
What is the chemical formula for the ionic compound formed between calcium (Ca²⁺) and phosphide (P³⁻)?
- Ca₃P₂ (correct)
- Ca₂P₃
- CaP₂
- CaP
Which of the following compounds is most likely to be an ionic compound?
Which of the following compounds is most likely to be an ionic compound?
When the equation Fe + O₂ → Fe₂O₃ is balanced, what is the coefficient for $O₂$?
When the equation Fe + O₂ → Fe₂O₃ is balanced, what is the coefficient for $O₂$?
Given the unbalanced equation C₃H₈ + O₂ → CO₂ + H₂O, what coefficient is required in front of $O₂$ to balance the equation?
Given the unbalanced equation C₃H₈ + O₂ → CO₂ + H₂O, what coefficient is required in front of $O₂$ to balance the equation?
What is the correct balanced equation for the reaction Al₂O₃ + HCl → AlCl₃ + H₂O?
What is the correct balanced equation for the reaction Al₂O₃ + HCl → AlCl₃ + H₂O?
In the Lewis structure of ammonia (NH₃), how many lone pairs of electrons are present on the nitrogen atom?
In the Lewis structure of ammonia (NH₃), how many lone pairs of electrons are present on the nitrogen atom?
What is the correct chemical formula for the compound formed between aluminum (Al³⁺) and sulfate (SO₄²⁻) ions?
What is the correct chemical formula for the compound formed between aluminum (Al³⁺) and sulfate (SO₄²⁻) ions?
In evaluating a Lewis structure, which of the following is a critical criterion for determining its correctness?
In evaluating a Lewis structure, which of the following is a critical criterion for determining its correctness?
Flashcards
Balancing Chemical Equations
Balancing Chemical Equations
Ensuring the number of atoms for each element is the same on both sides of the equation.
Lewis Structure
Lewis Structure
A visual representation of how electrons are arranged in a molecule.
Water Formation Equation
Water Formation Equation
The balanced chemical equation for water formation is 2H₂ + O₂ → 2H₂O.
Lewis Structure of CO₂
Lewis Structure of CO₂
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Calcium Phosphide Formula
Calcium Phosphide Formula
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Ionic Compound
Ionic Compound
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Octet Rule
Octet Rule
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Lewis Structure of Ammonia
Lewis Structure of Ammonia
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Writing Chemical Formula
Writing Chemical Formula
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Fixing Lewis Structure Errors
Fixing Lewis Structure Errors
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Study Notes
- The number of atoms must be equal on both sides of a balanced equation.
Balancing Equations
- 2H₂ + O₂ → 2H₂O is the balanced equation for the formation of water (H₂O) from Hydrogen (H₂) and Oxygen (O₂).
- 2Na + Cl₂ → 2NaCl is the balanced form of Na + Cl₂ → NaCl.
- 4Fe + 3O₂ → 2Fe₂O₃ is the balanced form of Fe + O₂ → Fe₂O₃.
- N₂ + 2O₂ → 2NO₂ is the balanced form of N₂ + O₂ → NO₂.
- C₃H₈ + 5O₂ → 3CO₂ + 4H₂O is the balanced equation for the combustion of propane (C₃H₈).
- H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O is the balanced form of H₂SO₄ + NaOH → Na₂SO₄ + H₂O.
- Zn + 2HCl → ZnCl₂ + H₂ is the balanced form of Zn + HCl → ZnCl₂ + H₂
- Al₂O₃ + 6HCl → 2AlCl₃ + 3H₂O is the balanced form of Al₂O₃ + HCl → AlCl₃ + H₂O.
Lewis Structures
- Carbon (C) is the central atom in the Lewis structure for Carbon Dioxide (CO₂), with double bonds to two Oxygen (O) atoms (O=C=O).
- To draw Lewis structures, count valence electrons, arrange atoms with a the central atom in the middle, and use bonds to satisfy the octet rule, except for Hydrogen (H), which needs 2 electrons.
- In Ammonia (NH₃), Nitrogen (N) is the central atom, with 3 single bonds to Hydrogen (H) atoms and one lone pair.
- In COCl₂, Carbon (C) is the central atom, with a double bond to Oxygen (O) and single bonds to two Chlorine (Cl) atoms.
- In Methane (CH₄), Carbon (C)is the central atom, with 4 single bonds to Hydrogen (H) atoms.
- In Ethyne (C₂H₂), two Carbon (C) atoms are triple bonded, and each Carbon (C) has 1 Hydrogen (H) atom attached.
Chemical Formulas
- Calcium (Ca²⁺) and Phosphide (P³⁻) combine in a 3:2 ratio to balance charges; the chemical formula for Calcium Phosphide is Ca₃P₂.
- Ionic compounds form between a metal and a non-metal; Sodium Chloride (NaCl) is an example of an ionic compound.
- Charges must cancel out make a neutral compound.
- Mg²⁺ + N³⁻ → Mg₃N₂
- Al³⁺ + SO₄²⁻ → Al₂(SO₄)₃
- Ca²⁺ + PO₄³⁻ → Ca₃(PO₄)₂
- K⁺ + O²⁻ → K₂O
- Fe³⁺ + Cl⁻ → FeCl₃
Fixing Lewis Structure Errors
- Each atom in a Lewis structure should follow the octet rule, except for Hydrogen (H), which needs 2 electrons.
- Ensure the correct number of bonds and electron pairs in a Lewis structure.
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