Gr 9 NATURAL SCIENCES: CH 2.3 The general reaction of metals with oxygen

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Questions and Answers

What type of equation represents a chemical reaction using words?

  • Chemical equation
  • Word equation (correct)
  • Picture equation
  • Symbolic equation

What is the general word equation for the reaction of metals with oxygen?

  • metal + oxygen → metal oxide (correct)
  • metal + oxygen → metal carbonate
  • metal + oxygen → metal hydroxide
  • metal + oxygen → metal sulfate

What is the purpose of coefficients in a chemical equation?

  • To show the state of matter of the reactants
  • To balance the number of atoms on both sides of the equation (correct)
  • To indicate the type of bond formed
  • To indicate the direction of the reaction

What is represented in a picture equation?

<p>Particle diagrams of the reactants and products (D)</p> Signup and view all the answers

What are the small numbers within a chemical formula called?

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

What is the general formula for the oxides of Group 1 metals?

<p>M2O (B)</p> Signup and view all the answers

Which of the following equations represents the reaction of calcium with oxygen?

<p>2Ca + O2 → 2CaO (D)</p> Signup and view all the answers

What is the product of the reaction between iron and oxygen?

<p>iron(III) oxide (D)</p> Signup and view all the answers

How many moles of oxygen are required to react with 4 moles of iron?

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

What is the word equation for the reaction of iron with oxygen?

<p>iron + oxygen → iron(III) oxide (D)</p> Signup and view all the answers

What is the general chemical equation for Group 2 metals reacting with oxygen?

<p>2M + O2 → 2MO (D)</p> Signup and view all the answers

What is the formula of the oxide formed when a Group 1 metal reacts with oxygen?

<p>M2O (A)</p> Signup and view all the answers

What is the correct chemical equation for the reaction of potassium with oxygen?

<p>4K + O2 → 2K2O (C)</p> Signup and view all the answers

What is the product of the reaction between iron and oxygen?

<p>iron (III) oxide (B)</p> Signup and view all the answers

What is the correct coefficient of iron in the balanced equation for the reaction of iron with oxygen?

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

What is the main difference between a word equation and a chemical equation?

<p>Word equations use words, while chemical equations use symbols and formulas. (B)</p> Signup and view all the answers

What is the purpose of balancing a chemical equation?

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

What is represented by the numbers in front of the chemical formulas in a chemical equation?

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

What is the product of the reaction between magnesium and oxygen?

<p>Magnesium oxide (MgO) (A)</p> Signup and view all the answers

What type of diagram is used to represent the particles involved in a chemical reaction?

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

What is the primary reason for balancing a chemical equation?

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

What is the role of subscripts in a chemical formula?

<p>To denote the number of atoms of an element in a molecule (A)</p> Signup and view all the answers

What is the advantage of using chemical equations over word equations?

<p>Chemical equations provide a more detailed representation of the reaction (C)</p> Signup and view all the answers

What is the purpose of coefficients in a chemical equation?

<p>To specify the mole ratio of the reactants (A)</p> Signup and view all the answers

Which of the following is a characteristic of a picture equation?

<p>It represents the particles involved in a chemical reaction (C)</p> Signup and view all the answers

What is the difference between the oxides formed by Group 1 and Group 2 metals?

<p>Group 1 metals form oxides with the formula M2O, while Group 2 metals form oxides with the formula MO. (C)</p> Signup and view all the answers

Which of the following reactions is an example of a Group 2 metal reacting with oxygen?

<p>2Ca + O2 → 2CaO (C)</p> Signup and view all the answers

What is the coefficient of oxygen in the balanced equation for the reaction of iron with oxygen?

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

What is the formula of the oxide formed when a Group 2 metal reacts with oxygen?

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

Which of the following is NOT a characteristic of the reaction of Group 2 metals with oxygen?

<p>The reaction involves the formation of a metal hydroxide. (A)</p> Signup and view all the answers

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