Chemistry Balancing and Composition Quiz
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Questions and Answers

What is the percent composition of lithium (Li) in lithium carbonate (Li2CO3)?

  • 18.79% (correct)
  • 12.01%
  • 64.96%
  • 28.74%

    • Which of the following is the correct first step when balancing a chemical equation?

  • Count the number of atoms present.
  • Change the coefficients of compounds before elements. (correct)
  • Combine similar polyatomic ions.
  • Change the coefficients of elements before compounds.

    • What is the percent composition of carbon (C) in lithium carbonate (Li2CO3)?

  • 16.25% (correct)
  • 64.96%
  • 18.79%
  • 24.05%

    • In a chemical equation, how should polyatomic ions that appear on both sides be treated?

    <p>As units.</p> Signup and view all the answers

    What is the percent composition of oxygen (O) in lithium carbonate (Li2CO3)?

    <p>64.96%</p> Signup and view all the answers

    Which of the following statements about balancing chemical equations is TRUE?

    <p>The number of atoms must be the same on both sides of the equation.</p> Signup and view all the answers

    What is the purpose of balancing a chemical equation?

    <p>To ensure an equal number of atoms of each element on both sides.</p> Signup and view all the answers

    What is combustion in chemistry?

    <p>Burning in the presence of oxygen.</p> Signup and view all the answers

    What is the balanced product when barium hydroxide reacts with nitric acid in the equation: Ba(OH)2(aq) + 2HClO4(aq)?

    <p>Ba(ClO4)2(aq) + H2O(l)</p> Signup and view all the answers

    What is the stoichiometric coefficient for water in the balanced chemical equation for the complete combustion of butyric acid?

    <p>4</p> Signup and view all the answers

    How many moles of oxygen are required to completely metabolize one mole of butyric acid?

    <p>5</p> Signup and view all the answers

    In the balanced reaction of barium hydroxide and those moles of HClO4, what is the coefficient of H in the product side?

    <p>2</p> Signup and view all the answers

    What is the numerical value of Avogadro's number?

    <p>6.022 × 10^23</p> Signup and view all the answers

    What type of reaction occurs when Ba(OH)2 reacts with HClO4?

    <p>Neutralization</p> Signup and view all the answers

    Which coefficient correctly balances the equation: C4H8O2(aq) + O2(g) → CO2(g) + H2O(l)?

    <p>All above are correct</p> Signup and view all the answers

    How is one mole defined in terms of carbon-12?

    <p>The number of atoms in 12 grams of carbon-12</p> Signup and view all the answers

    In the equation for the metabolism of butyric acid, how many carbon dioxide molecules are produced from one molecule of butyric acid?

    <p>4</p> Signup and view all the answers

    Which of the following best describes the mole as a counting group?

    <p>It is a fixed quantity of a substance</p> Signup and view all the answers

    What do you get if you order one mole of a substance?

    <p>6.022 × 10^23 particles of that substance</p> Signup and view all the answers

    What is the net result of the reaction: Ba(OH)2 + 2HClO4?

    <p>Ba(ClO4)2 + H2O</p> Signup and view all the answers

    If you have 12 grams of carbon-12, how many moles do you have?

    <p>1 mole</p> Signup and view all the answers

    In which unit is molar mass typically expressed?

    <p>g/mol</p> Signup and view all the answers

    Which of the following formulas determines the empirical formula from percent composition?

    <p>Convert each percentage to moles and simplify</p> Signup and view all the answers

    How many molecules are present in 2 moles of a substance?

    <p>2 × 6.022 × 10^23</p> Signup and view all the answers

    How many moles of /(NH2)2CO are produced from 5.25 moles of NH3?

    <p>2.63 mol</p> Signup and view all the answers

    What is the balanced reaction for the decomposition of ammonium nitrate?

    <p>NH4NO3(s) → N2O(g) + 2H2O(g)</p> Signup and view all the answers

    What is the molar mass of ammonium nitrate (NH4NO3)?

    <p>80.05 g/mol</p> Signup and view all the answers

    If 10.0 g of N2O is produced, how many grams of NH4NO3 are needed?

    <p>22.73 g</p> Signup and view all the answers

    How many moles of CO2 are produced when 5.25 moles of NH3 are consumed?

    <p>2.63 mol</p> Signup and view all the answers

    What is the molar mass of water (H2O)?

    <p>18.02 g/mol</p> Signup and view all the answers

    What is the mass of water produced when 10.0 g of N2O is formed?

    <p>15.0 g</p> Signup and view all the answers

    Which ingredient is identified as the limiting reactant in the reaction?

    <p>Citric acid (H3C6H5O7)</p> Signup and view all the answers

    What is a step in converting mass of reactants to moles?

    <p>Divide the mass by the molar mass.</p> Signup and view all the answers

    What is the mass of sodium bicarbonate (NaHCO3) before the reaction begins?

    <p>1.700 g</p> Signup and view all the answers

    What is the mass of citric acid (H3C6H5O7) used in the reaction?

    <p>1.000 g</p> Signup and view all the answers

    How many moles of sodium bicarbonate remain unreacted after the reaction is complete?

    <p>0.00462 mol</p> Signup and view all the answers

    What mass of carbon dioxide (CO2) is produced when one tablet dissolves?

    <p>3.100 g</p> Signup and view all the answers

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