Questions and Answers
What is the formula for copper(II) carbonate?
CuCO₃
What is the formula for sodium sulfite?
Na₂SO₃
What is the formula for ammonium phosphate?
(NH₄)₃PO₄
What is the formula for tin(IV) sulfide?
Signup and view all the answers
What is the formula for nitrous acid?
Signup and view all the answers
What is the name for the compound with the formula Mg(ClO₄)₂?
Signup and view all the answers
What is the formula for iron(II) nitrate?
Signup and view all the answers
What is the formula for cobalt(II) oxide?
Signup and view all the answers
How many atoms are represented by the formula Ca(HSO₄)₂?
Signup and view all the answers
How many moles of oxygen are in a 0.50 mol sample of sodium hydroxide?
Signup and view all the answers
What is the oxidation number of sulfur in the HSO₄⁻ anion?
Signup and view all the answers
What is the oxidation number of hydrogen in H₂O₂?
Signup and view all the answers
What is the oxidation number of hydrogen in MgH₂?
Signup and view all the answers
What is the oxidation number of sulfur in S₈?
Signup and view all the answers
What is the oxidation number of carbon in (CO₃)²⁻?
Signup and view all the answers
What is the oxidation number of chromium in Na₂Cr₂O₇?
Signup and view all the answers
What is the oxidation number of nitrogen in NO₂?
Signup and view all the answers
Arrange the following compounds in order of increasing mass from smallest to largest: a. 25 g of oxygen gas, b. 1.00 mol of H₂O, c. 3 × 10²³ of C₂H₆, d. 2 × 10²³ of C₂H₆O₂.
Signup and view all the answers
What is the formula for sodium hydroxide?
Signup and view all the answers
What is the formula mass of sodium hydroxide?
Signup and view all the answers
What is the mass in grams of 0.25 mol of sodium hydroxide?
Signup and view all the answers
What is the percentage composition of ethane gas, C₂H₆, to the nearest whole number?
Signup and view all the answers
What is the molecular formula of ribose if its empirical formula is CH₂O?
Signup and view all the answers
For butane, determine the following: a. What is the mass in grams of 3.00 mol? b. How many molecules are present in that 3.00 mol sample? c. What is the empirical formula of the gas?
Signup and view all the answers
What is the molecular formula of naphthalene?
Signup and view all the answers
Determine the empirical formula of nicotine based on 1.0 mol of CO₂, 0.70 mol of H₂O, and 0.20 mol of NO₂.
Signup and view all the answers
What is the molar mass of nicotine if it is found to be between 150 and 180 g/mol?
Signup and view all the answers
When MgCO₃(s) is strongly heated, what is the percentage loss in mass?
Signup and view all the answers
What are the oxidation numbers of Mg, C, and O in MgCO₃?
Signup and view all the answers
The oxidation number of carbon changes upon the formation of CO₂.
Signup and view all the answers
Study Notes
Chemical Formulas and Compounds
- Copper(II) carbonate: CuCO₃
- Sodium sulfite: Na₂SO₃
- Ammonium phosphate: (NH₄)₃PO₄
- Tin(IV) sulfide: SnS₂
- Nitrous acid: HNO₂
- Magnesium perchlorate: Mg(ClO₄)₂
- Iron(II) nitrate: Fe(NO₃)₂
- Cobalt(II) oxide: Fe(NO₂)₃
- Nitrogen(V) oxide: CoO
Atom and Mole Calculations
- Formula Ca(HSO₄)₂ contains 13 atoms.
- A 0.50 mol sample of the compound has 4.0 mol of oxygen.
Oxidation Numbers
- Sulfur in HSO⁻₄: +6
- Hydrogen in H₂O₂: +1
- Hydrogen in MgH₂: -1
- Sulfur in S₈: 0
- Carbon in (CO₃)²⁻: +4
- Chromium in Na₂Cr₂O₇: +6
- Nitrogen in NO₂: +4
Mass Comparison of Compounds
- Arrange compounds by increasing mass: C₂H₆ (3 × 10²³ molecules), H₂O (1.00 mol), C₂H₆O₂ (2 × 10²³ molecules), O₂ (25 g).
Common Chemical Formulas and Calculations
- Formula for sodium hydroxide: NaOH.
- Formula mass of sodium hydroxide: 40.00 g/mol.
- Mass of 0.25 mol of sodium hydroxide: 10.0 g.
Percentage Composition
- Ethane (C₂H₆) has a composition of approximately 80% Carbon and 20% Hydrogen.
Empirical and Molecular Formulas
- Ribose (RNA sugar): empirical formula CH₂O, molecular formula C₅H₁₀O₅.
- Butane: mass of 3.00 mol is 174 g, contains 1.81 × 10²⁴ molecules, empirical formula is C₂H₅.
- Naphthalene: molar mass 128.18 g/mol, composed of C₁₀H₈.
Nicotine Analysis
- Combustion of nicotine produces:
- 1.0 mol of CO₂ (Carbon)
- 1.40 mol of H₂O (Hydrogen)
- 0.20 mol of NO₂ (Nitrogen)
- Empirical formula of nicotine determined as C₅H₇N.
- Molar mass of nicotine calculated as 162 g/mol.
Chemical Reactions and Mass Change
- Decomposition of MgCO₃(s) into MgO and CO₂ results in a percentage mass loss of 52.2%.
- Oxidation numbers in MgCO₃: Mg (+2), C (+4), O (-2).
- Carbon's oxidation state remains unchanged during conversion to CO₂.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge of chemical formulas and compounds with this mixed review quiz. Each flashcard presents a chemical compound along with its formula. Ideal for students looking to reinforce their understanding of chemistry in Chapter 7.
