Oxidation Numbers Quiz
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Questions and Answers

What is the oxidation state of chlorine in Cl^-?

The oxidation state of chlorine in Cl^- is -1.

Determine the oxidation state of nitrogen in NO2^-.

The oxidation state of nitrogen in NO2^- is +3.

What is the ionic charge of calcium in Ca^2+?

The ionic charge of calcium in Ca^2+ is +2.

Identify the oxidation state of sulfur in H2S.

<p>The oxidation state of sulfur in H<del>2</del>S is -2.</p> Signup and view all the answers

What is the oxidation state of phosphorus in P4?

<p>The oxidation state of phosphorus in P<del>4</del> is 0.</p> Signup and view all the answers

Determine the oxidation state of iron in Fe(ClO2)3.

<p>The oxidation state of iron in Fe(ClO<del>2</del>)<del>3</del> is +3.</p> Signup and view all the answers

What is the oxidation state of manganese in KMnO4?

<p>The oxidation state of manganese in KMnO<del>4</del> is +7.</p> Signup and view all the answers

Identify the charge of sodium in Na2S.

<p>The charge of sodium in Na<del>2</del>S is +1.</p> Signup and view all the answers

What is the oxidation number of nitrogen in $N_2O_3$?

<p>The oxidation number of nitrogen in $N_2O_3$ is +3.</p> Signup and view all the answers

Determine the oxidation number of sulfur in $H_2SO_4$.

<p>The oxidation number of sulfur in $H_2SO_4$ is +6.</p> Signup and view all the answers

What is the oxidation number of carbon in methane, $CH_4$?

<p>The oxidation number of carbon in $CH_4$ is -4.</p> Signup and view all the answers

Find the oxidation number of carbon in carbon monoxide, $CO$.

<p>The oxidation number of carbon in $CO$ is +2.</p> Signup and view all the answers

What is the oxidation number of sodium in sodium chloride, $NaCl$?

<p>The oxidation number of sodium in $NaCl$ is +1.</p> Signup and view all the answers

Determine the oxidation state of manganese in $MnO_2$.

<p>The oxidation state of manganese in $MnO_2$ is +4.</p> Signup and view all the answers

What is the oxidation number of sulfur in the sulfate ion, $SO_3^{2-}$?

<p>The oxidation number of sulfur in $SO_3^{2-}$ is +4.</p> Signup and view all the answers

Find the oxidation state of magnesium in the ion $Mg^{2+}$.

<p>The oxidation state of magnesium in $Mg^{2+}$ is +2.</p> Signup and view all the answers

Flashcards

How many hydrogen atoms in H2O?

The number of hydrogen atoms in a water molecule is two.

How many barium atoms in BaCl2?

The subscript in the chemical formula indicates the number of atoms present. Here, there is one barium atom.

How many nitrogen atoms in N2?

Nitrogen is a diatomic element, meaning it exists as two atoms bonded together. Therefore, there are two nitrogen atoms in elemental nitrogen.

How many phosphorus atoms in P4?

The subscript after phosphorus symbol (P) indicates the number of phosphorus atoms present in the molecule. In this case, there are four phosphorus atoms.

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How many sulfur atoms in H2S?

The subscript in the formula tells us the number of atoms. In this case, there's one sulfur atom.

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How many calcium atoms in Ca^2+^?

The subscript after calcium indicates the number of calcium atoms present. In this case, there is one calcium atom.

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How many chlorine atoms in Fe(ClO2)3?

The subscript after chlorine tells us the number of chlorine atoms. Here, there are three chlorine atoms.

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How many iron atoms in Fe(ClO2)3?

Looking at the subscript, we see there is one iron atom in the formula.

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Oxidation Number of a Pure Element

The oxidation number of a pure element is always 0.

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Oxidation Number of a Monatomic Ion

The oxidation number of a monatomic ion is equal to the charge of the ion.

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Oxidation Number in Binary Compounds

The more electronegative element in a binary compound takes the negative oxidation number, equal to its expected ionic charge.

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Oxidation Number of Fluorine

Fluorine always has an oxidation number of -1 in compounds.

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Oxidation Number of Oxygen

Oxygen has an oxidation number of -2 in most compounds. Exceptions include when bonded to fluorine (+1 or +2) or in peroxides (-1).

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Oxidation Number of Hydrogen

Hydrogen has an oxidation number of +1 usually, except when bonded to a metal where it becomes -1.

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Oxidation Numbers of Group 1, 2, and Aluminum

In compounds, elements in Group 1 have a +1 oxidation number, elements in Group 2 have a +2 oxidation number, and Aluminum has a +3 oxidation number.

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Oxidation Numbers in a Neutral Compound

The sum of the oxidation numbers of all atoms in a neutral compound is 0.

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Study Notes

Oxidation Numbers

  • Pure elements have an oxidation number of 0.
  • Monatomic ions have an oxidation number equal to their charge.
  • Fluorine's oxidation number is always -1 in compounds.
  • Oxygen's oxidation number is -2, except in peroxides (-1) or when combined with fluorine (+1 or +2).
  • Hydrogen's oxidation number is +1, except when combined with a metal (-1).
  • Group 1 elements are +1, Group 2 elements are +2, and aluminum is +3 in compounds.
  • The sum of oxidation numbers in a neutral compound is 0.
  • The sum of oxidation numbers in a polyatomic ion equals the ion's charge.

Oxidation Number Examples

  • N in N₂O₃: +3
  • S in H₂SO₄: +6
  • C in CH₄: -4
  • Mn in MnO₂: +4
  • S in SO₃²⁻: +4
  • Mg²⁺: +2
  • Cl⁻: -1
  • O₂: -2
  • P₄: 0
  • Na in Na₂S: +1

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Chemistry for Engineers Mastery Activity #18 PDF

Description

Test your knowledge of oxidation numbers with this quiz! From understanding the rules to applying them in examples, this quiz covers various aspects of oxidation states in compounds. Challenge yourself to see how well you know oxidation numbers.

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