Gr 10 Physical Sciences Ch 11: Balancing chemical equations

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Questions and Answers

What is the purpose of Step 3 in balancing a chemical equation?

  • To indicate that heat is required for a reaction
  • To count the number of atoms of each element (correct)
  • To add state symbols to the equation
  • To write the unbalanced equation

What symbol is used to indicate that heat is required for a reaction?

  • (g) for gaseous compounds
  • ∆ (correct)
  • (l) for liquids
  • (aq) for aqueous solutions

What is the correct state symbol for solid compounds?

  • (g)
  • (aq)
  • (s) (correct)
  • (l)

In which step do you verify that all atoms are balanced?

<p>Step 5 (A)</p> Signup and view all the answers

What is the purpose of adding coefficients to the molecules in a chemical equation?

<p>To balance the number of atoms of each element (A)</p> Signup and view all the answers

In the balanced equation for the combustion of methane, how many molecules of oxygen are required?

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

What is the correct sequence of steps in balancing a chemical equation?

<p>Write the unbalanced equation, count the atoms, balance the atoms, verify, and add state symbols (A)</p> Signup and view all the answers

What is the purpose of Step 6 in balancing a chemical equation?

<p>To add state symbols to the equation (B)</p> Signup and view all the answers

What is the law of conservation of mass?

<p>The mass of a closed system will remain constant, regardless of the processes occurring within the system (C)</p> Signup and view all the answers

What happens to the mass of a closed system during a chemical reaction?

<p>It remains constant (B)</p> Signup and view all the answers

What is the purpose of balancing a chemical equation?

<p>To ensure the law of conservation of mass is obeyed (D)</p> Signup and view all the answers

What is the first step in balancing a chemical equation?

<p>Identify the reactants and products (B)</p> Signup and view all the answers

What is the result of balancing the equation for the reaction between iron and sulfur?

<p>The mass of the reactants equals the mass of the products (C)</p> Signup and view all the answers

What is the total mass of one molecule of FeS?

<p>87.9 g/mol (D)</p> Signup and view all the answers

Why is it necessary to balance a chemical equation?

<p>To ensure the law of conservation of mass is obeyed (D)</p> Signup and view all the answers

What is the purpose of using the relative atomic masses in balancing a chemical equation?

<p>To calculate the mass of the molecules (C)</p> Signup and view all the answers

Which step in balancing a chemical equation involves counting the number of atoms of each element in the reactants and products?

<p>Step 3 (B)</p> Signup and view all the answers

What is the purpose of adding coefficients in balancing a chemical equation?

<p>To make the number of atoms of each element equal on both sides (C)</p> Signup and view all the answers

What is indicated by the symbol ∆ in a chemical equation?

<p>The presence of heat (D)</p> Signup and view all the answers

What is the correct sequence of steps in balancing a chemical equation if the equation is not balanced?

<p>Change the coefficients, add state symbols, verify (D)</p> Signup and view all the answers

What is the purpose of state symbols in a chemical equation?

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

Which of the following is an example of a balanced chemical equation?

<p>CH₄ + 2O₂ → CO₂ + 2H₂O (B)</p> Signup and view all the answers

What is the result of balancing the equation for the combustion of methane?

<p>One molecule of methane reacts with two molecules of oxygen to produce one molecule of carbon dioxide and two molecules of water (D)</p> Signup and view all the answers

What is the importance of balancing a chemical equation?

<p>To ensure that the number of atoms of each element is equal on both sides (D)</p> Signup and view all the answers

What is the fundamental principle that states that the mass of a closed system will remain constant, regardless of the processes occurring within the system?

<p>Law of Conservation of Mass (B)</p> Signup and view all the answers

What is the reason for balancing a chemical equation?

<p>To ensure that the number of atoms of each element is the same on both sides of the equation (C)</p> Signup and view all the answers

What is the first step in balancing a chemical equation?

<p>Identify the reactants and the products in the reaction and write their chemical formulas (D)</p> Signup and view all the answers

What is the purpose of using the relative atomic masses in balancing a chemical equation?

<p>To calculate the mass of the reactants and products (D)</p> Signup and view all the answers

What is the result of balancing the equation for the reaction between iron and sulfur?

<p>The mass of the reactants equals the mass of the products (B)</p> Signup and view all the answers

What is the consequence of not balancing a chemical equation?

<p>The mass of the reactants will not equal the mass of the products (C)</p> Signup and view all the answers

What is the purpose of ensuring that the number of atoms of each element is the same on both sides of the equation?

<p>To ensure that the mass of the reactants equals the mass of the products (B)</p> Signup and view all the answers

What is the underlying principle that ensures that the total mass of the reactants equals the total mass of the products in a chemical reaction?

<p>Law of Conservation of Mass (A)</p> Signup and view all the answers

What is the fundamental principle that governs the balancing of a chemical equation?

<p>The law of conservation of mass (D)</p> Signup and view all the answers

What is the purpose of balancing a chemical equation?

<p>To ensure that the number of atoms of each element is the same on both sides of the equation (A)</p> Signup and view all the answers

According to the law of conservation of mass, what happens to the mass of a closed system during a chemical reaction?

<p>It remains constant (A)</p> Signup and view all the answers

What is the result of balancing the equation for the reaction between iron and sulfur?

<p>The mass of the reactants equals the mass of the products (C)</p> Signup and view all the answers

Why is it necessary to balance a chemical equation?

<p>To ensure that the law of conservation of mass is obeyed (B)</p> Signup and view all the answers

What is the correct sequence of steps in balancing a chemical equation?

<p>Identify the reactants and products, write the equation, and then balance (D)</p> Signup and view all the answers

What is the purpose of using the relative atomic masses in balancing a chemical equation?

<p>To calculate the total mass of the reactants and products (B)</p> Signup and view all the answers

What is the consequence of not balancing a chemical equation?

<p>The law of conservation of mass will not be obeyed (B)</p> Signup and view all the answers

What is the purpose of Step 4 in balancing a chemical equation?

<p>To adjust the coefficients to balance the atoms (A)</p> Signup and view all the answers

What does the state symbol (g) represent in a chemical equation?

<p>Gaseous compound (A)</p> Signup and view all the answers

What is the purpose of adding coefficients to the molecules in a chemical equation?

<p>To balance the atoms (D)</p> Signup and view all the answers

What is the result of balancing the equation for the combustion of methane?

<p>CH₄ + 2O₂ → CO₂ + 2H₂O (A)</p> Signup and view all the answers

What is the importance of ensuring that the number of atoms of each element is the same on both sides of the equation?

<p>To ensure the law of conservation of mass is obeyed (A)</p> Signup and view all the answers

What is indicated by the symbol Δ in a chemical equation?

<p>Heat is required for the reaction (A)</p> Signup and view all the answers

What is the purpose of Step 5 in balancing a chemical equation?

<p>To verify that all atoms are balanced (C)</p> Signup and view all the answers

What is the correct sequence of steps in balancing a chemical equation if the equation is not balanced?

<p>Identify the reactants and products, write the unbalanced equation, count the number of atoms, adjust the coefficients, verify that all atoms are balanced, and add state symbols (C)</p> Signup and view all the answers

What is the primary reason for balancing a chemical equation?

<p>To verify that the law of conservation of mass is upheld (A)</p> Signup and view all the answers

What is the effect of not balancing a chemical equation?

<p>The mass of the reactants will not equal the mass of the products (C)</p> Signup and view all the answers

In which step of balancing a chemical equation do you adjust the coefficients to balance the atoms?

<p>Step 4 (C)</p> Signup and view all the answers

What is the purpose of state symbols in a chemical equation?

<p>To indicate the phase of the reactants and products (B)</p> Signup and view all the answers

What is the correct sequence of steps in balancing a chemical equation if the equation is not balanced?

<p>Steps 1, 2, 3, 4, 5, 6 (D)</p> Signup and view all the answers

What is indicated by the symbol Δ in a chemical equation?

<p>Heat is required for the reaction (B)</p> Signup and view all the answers

What is the purpose of counting the number of atoms of each element in the reactants and products?

<p>To balance the atoms in the equation (A)</p> Signup and view all the answers

What is the result of balancing the equation for the combustion of methane?

<p>CH₄ + 2O₂ → CO₂ + 2H₂O (D)</p> Signup and view all the answers

What is the primary reason for ensuring that the number of atoms of each element is the same on both sides of a chemical equation?

<p>To satisfy the law of conservation of mass (B)</p> Signup and view all the answers

What is the purpose of calculating the mass of the reactants and products in a chemical equation?

<p>To verify the law of conservation of mass (A)</p> Signup and view all the answers

What happens to the mass of the reactants and products in a balanced chemical equation?

<p>The mass of the reactants and products remains the same (A)</p> Signup and view all the answers

What is the consequence of not balancing a chemical equation?

<p>The reaction will occur, but the mass of the reactants will not equal the mass of the products (C)</p> Signup and view all the answers

What is the primary goal of balancing a chemical equation?

<p>To satisfy the law of conservation of mass (D)</p> Signup and view all the answers

What is the purpose of using the relative atomic masses in balancing a chemical equation?

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

What is the underlying principle that governs the balancing of a chemical equation?

<p>The law of conservation of mass (D)</p> Signup and view all the answers

What is the importance of ensuring that the number of atoms of each element is the same on both sides of a chemical equation?

<p>It ensures that the law of conservation of mass is satisfied (C)</p> Signup and view all the answers

What is the purpose of Step 2 in balancing a chemical equation?

<p>To write the unbalanced equation (A)</p> Signup and view all the answers

What is the correct sequence of elements to balance in a chemical equation?

<p>Carbon, hydrogen, oxygen (B)</p> Signup and view all the answers

What is indicated by the state symbol (aq) in a chemical equation?

<p>An aqueous solution (D)</p> Signup and view all the answers

Why is it important to balance a chemical equation?

<p>To ensure that the number of atoms of each element is the same on both sides of the equation (C)</p> Signup and view all the answers

What is the purpose of adding coefficients in a chemical equation?

<p>To balance the atoms of each element (A)</p> Signup and view all the answers

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