IB Chemistry

What substance is oxidized in the following reaction?
4Fe + 3O₂ --> 2Fe₂O₃

• Iron

• Fluorine

• Oxygen

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following half reactions correctly represents a reduction half reaction?

• Fe →Fe²⁺ + 2e^-

• Pb⁴⁺ + 2e^- →Pb²⁺

• 2O^-2 →O₂ + 4e^-

• Fe + 3e^- →Fe³⁺

An oxidizing agent is the substance that is

• oxidized

• reduced

• not changed

A reducing agent is the substance that is

• oxidized

• reduced

• not changed

How is an oxidation state written?

• sign given before the number (+2)

• sign given after the number (2+)

The activity series ranks metals according to the ease with which they undergo

• oxidation

• reduction

• neutralization

• combustion

A more reactive metal is able to

• oxidize the ions of a less reactive metal

• reduce the ions of a less reactive metal

Tags

NGSS.HS-PS1-1

What are the coefficients when the equation is balanced?

• 1 + 1 + 1 --> 2 + 1 + 3

• 2 + 2 + 2 --> 4 + 2 + 3

• 1 + 2 + 1 --> 2 + 2 + 3

• 1 + 1 + 1 --> 1 + 1 + 1

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

Which can describe oxidation?

• Loss of hydrogen

• Decrease in oxidation number

• Gain of electrons

• Loss of oxygen

Which list represents the halogens in increasing order of oxidizing strength (weakest oxidizing agent first)?

• Cl₂ -- I₂ -- Br₂

• I₂ -- Br₂ -- Cl₂

• I₂ -- Cl₂ -- Br₂

• Cl₂ -- Br₂ -- I₂