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. (C)</p> Signup and view all the answers

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

<p>64.96% (D)</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. (B)</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. (A)</p> Signup and view all the answers

What is combustion in chemistry?

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

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

<p>5 (B)</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 (C)</p> Signup and view all the answers

What is the numerical value of Avogadro's number?

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

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

<p>Neutralization (A)</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 (B)</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 (D)</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 (B)</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 (C)</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 (C)</p> Signup and view all the answers

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

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

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

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

In which unit is molar mass typically expressed?

<p>g/mol (B)</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 (C)</p> Signup and view all the answers

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

<p>2 × 6.022 × 10^23 (B)</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 (C)</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) (D)</p> Signup and view all the answers

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

<p>80.05 g/mol (B)</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 (A)</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 (D)</p> Signup and view all the answers

What is the molar mass of water (H2O)?

<p>18.02 g/mol (B)</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 (A)</p> Signup and view all the answers

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

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

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

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

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

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

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

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

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

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

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