Redox Assignment 2

What is the oxidation number for Cl₂

• 0
• 1+
• 1-
• 0-

What are the oxidation numbers for NO₃^-

• N: 6-   O: 2+
• N: 6+   O: 2-
• N: 5-   O: 2+
• N: 5+   O: 2-

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What are the oxidation numbers for SO_4^2-

• S: 6+   O: 2-
• S: 8+   O: 2-
• S: 6-   O: 2+
• S: 8-   O: 2-

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What are the oxidation numbers for NH₄Cl

• N: 3+   H: 1+   Cl: 1-
• N: 3-   H: 1+   Cl: 1+
• N: 3-   H: 1+   Cl: 1-
• cannot be determined

Tags

NGSS.HS-PS1-2

What is the oxidation numbers of sulfur in SO₂

• +4
• 0
• -2
• +2

The term oxidation arose early in the history of chemistry, when scientists observed elements combining with oxygen in combustion reactions.
For example, S(s) + O2(g)  SO2(g). In this reaction,

• the oxygen is oxidized and the sulfur is oxidized.
• the oxygen is oxidized and the sulfur is reduced.
• the oxygen is reduced and the sulfur is reduced.
• the oxygen is reduced and the sulfur is oxidized.

When Cr3+ changes to Cr, the chromium ion is said to have been

• oxidized because it gained 3e.
• oxidized because it lost 3e.
• reduced because it gained 3e.
• reduced because it lost 3e.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the oxidizing agent of this reaction?
2Al_(s) + 6H⁺_(aq) −−−> 2Al³⁺ _(aq) + 3H_2(g)

• H₂
• Al³⁺
• Al
• H⁺

What is the reducing agent of this reaction?
3Mg + N₂−−−−> Mg₃N₂

• Mg
• N₂
• Mg₃N₂
• MgN

Tags

NGSS.HS-PS1-2

PbS + O₂ --> PbO + SO₂

Which of the following is correct?

• Oxygen was reduced, went from -2 to 0 charge

• Suflur was reduced, went from -2 to +4

• Sulfur was oxidized, went from -2 to +4

• Oxygen was oxidized, went from 0 to -2