Gr 10 Physical Sciences Ch 14: Amount of substance
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Questions and Answers

What is the unit of measurement for the amount of substance in a chemical reaction?

  • Grams
  • Moles (correct)
  • Litres
  • Atoms

What is the volume occupied by one mole of any gas at standard temperature and pressure (S.T.P.)?

  • 10.0 dm³
  • 30.0 dm³
  • 22.4 dm³ (correct)
  • 20.0 dm³

What is the definition of concentration in a solution?

  • Number of moles of solute per unit volume of solvent (correct)
  • Number of moles of solvent per unit volume of solute
  • Volume of solute per unit volume of solvent
  • Mass of solute per unit volume of solvent

What is the purpose of understanding molar volumes in gas reactions?

<p>To determine the amounts of reactants and products in reactions under standard conditions (D)</p> Signup and view all the answers

What is the significance of the molar volume of a gas?

<p>It allows us to easily convert between the volume of a gas and the number of moles (A)</p> Signup and view all the answers

What is the unit of concentration in a solution?

<p>mol·dm⁻³ (B)</p> Signup and view all the answers

What is the importance of knowing the concentration in preparing solutions?

<p>To prepare solutions of desired molarity (A)</p> Signup and view all the answers

What is the formula to calculate the concentration of a solution?

<p>C = n/V (A)</p> Signup and view all the answers

What is the volume of 3 moles of CO₂ gas at S.T.P.?

<p>67.2 dm³ (C)</p> Signup and view all the answers

What is the purpose of understanding the amount of substance in terms of moles?

<p>To predict the outcomes of chemical reactions and quantify reactants and products. (A)</p> Signup and view all the answers

If you have a volume of 44.8 dm³ of H₂ gas at S.T.P., how many moles of H₂ do you have?

<p>2 moles (D)</p> Signup and view all the answers

What is the concentration of a solution with 0.5 moles of NaCl in 1 dm³ of water?

<p>0.5 mol·dm⁻³ (D)</p> Signup and view all the answers

What is the unit of measurement for the volume of a gas at S.T.P.?

<p>dm³ (D)</p> Signup and view all the answers

What is the molar volume of an ideal gas at S.T.P.?

<p>22.4 dm³/mole (D)</p> Signup and view all the answers

What is the mole ratio of particles to moles in an ideal gas?

<p>6.022 x 10^23 particles per mole (D)</p> Signup and view all the answers

What is the advantage of understanding the amount of substance in terms of moles?

<p>It helps us predict the outcomes of chemical reactions (B)</p> Signup and view all the answers

What is the concentration of a solution with 2 moles of NaCl in 2 dm³ of water?

<p>1 mol·dm⁻³ (D)</p> Signup and view all the answers

If you have 2 moles of CO₂ gas, what is the volume at S.T.P.?

<p>67.2 dm³ (A)</p> Signup and view all the answers

Why is it important to know the concentration of a solution in a chemical reaction?

<p>To quantify the reactants and products (C)</p> Signup and view all the answers

What can be calculated from the volume of a gas at S.T.P.?

<p>The number of moles of the gas (D)</p> Signup and view all the answers

What is the advantage of using molar volumes in stoichiometric calculations?

<p>It simplifies conversions between volume and number of moles. (C)</p> Signup and view all the answers

A solution contains 2 moles of solute in 4 dm³ of solvent. What is its concentration?

<p>0.5 mol·dm⁻³ (C)</p> Signup and view all the answers

What is the volume of 2 moles of oxygen gas at S.T.P.?

<p>44.8 dm³ (A)</p> Signup and view all the answers

In a reaction involving gases, why is it important to understand molar volumes?

<p>To determine the amounts of reactants and products. (D)</p> Signup and view all the answers

What is the purpose of calculating concentration in a solution?

<p>To prepare solutions of desired molarity. (C)</p> Signup and view all the answers

How many moles of a gas are present in a 67.2 dm³ sample at S.T.P.?

<p>3 moles (D)</p> Signup and view all the answers

What is the relationship between the number of moles and the volume of a gas at S.T.P.?

<p>Volume is directly proportional to the number of moles. (C)</p> Signup and view all the answers

What is the significance of standard temperature and pressure (S.T.P.) in chemistry?

<p>It is used to define the molar volume of gases. (D)</p> Signup and view all the answers

If a container holds 3 moles of oxygen gas at S.T.P., what is the volume of the gas?

<p>67.2 dm³ (A)</p> Signup and view all the answers

What is the concentration of a solution containing 1.5 moles of potassium nitrate in 2.5 dm³ of water?

<p>0.6 mol·dm⁻³ (C)</p> Signup and view all the answers

A chemical reaction involves the reaction of 2 moles of hydrogen gas with 1 mole of oxygen gas at S.T.P. What is the total volume of the reactants?

<p>89.6 dm³ (D)</p> Signup and view all the answers

A solution contains 3.2 moles of sodium chloride in 4 dm³ of water. What is the concentration of the solution?

<p>0.8 mol·dm⁻³ (C)</p> Signup and view all the answers

What is the number of moles of a gas present in a 50.4 dm³ sample at S.T.P.?

<p>2.25 moles (B)</p> Signup and view all the answers

If a reaction requires 2.5 moles of nitrogen gas, what is the volume of the gas at S.T.P.?

<p>55.6 dm³ (A)</p> Signup and view all the answers

What is the primary reason for defining the molar volume of a gas at standard temperature and pressure (S.T.P.)?

<p>To simplify stoichiometric calculations in reactions involving gases (C)</p> Signup and view all the answers

A solution contains 3 moles of solute in 6 dm³ of solvent. What is the volume of the solution required to prepare a solution with half the concentration?

<p>9 dm³ (A)</p> Signup and view all the answers

What is the number of moles of a gas present in a 44.8 dm³ sample at S.T.P.?

<p>2 moles (A)</p> Signup and view all the answers

A gas reaction involves 2 moles of reactant A and 3 moles of reactant B. If the reaction occurs at S.T.P., what is the total volume of the reactants?

<p>89.6 dm³ (A)</p> Signup and view all the answers

What is the concentration of a solution with 0.5 moles of solute in 2 dm³ of solvent?

<p>0.25 mol·dm⁻³ (C)</p> Signup and view all the answers

A solution contains 1.5 moles of solute in 3 dm³ of solvent. What is the number of moles of solute required to prepare a solution with twice the concentration?

<p>6 moles (A)</p> Signup and view all the answers

What is the volume of 4 moles of oxygen gas at S.T.P.?

<p>88.8 dm³ (A)</p> Signup and view all the answers

A gas reaction involves 3 moles of product A and 2 moles of product B. If the reaction occurs at S.T.P., what is the total volume of the products?

<p>66.8 dm³ (B)</p> Signup and view all the answers

What is the volume of 2.5 moles of CH₄ gas at S.T.P.?

<p>55.6 dm³ (A)</p> Signup and view all the answers

A solution contains 2.0 moles of solute in 3.0 dm³ of solvent. What is the concentration of the solution?

<p>0.67 mol·dm⁻³ (B)</p> Signup and view all the answers

If you have a volume of 89.6 dm³ of N₂ gas at S.T.P., how many moles of N₂ do you have?

<p>4 moles (D)</p> Signup and view all the answers

Why is it important to understand the amount of substance in terms of moles in chemical reactions?

<p>To ensure that reactions are carried out efficiently, with the correct proportions of substances. (B)</p> Signup and view all the answers

What can be calculated from the volume of a gas at S.T.P.?

<p>The number of moles of the gas. (A)</p> Signup and view all the answers

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