What happens to Cr 3+ ion when it is converted to CrO 4 2–

Oxidation number increases and it undergo oxidation

Oxidation number decreases and it undergo reduction

Oxidation number decreases and it undergo oxidation

Oxidation number increases and it undergo reduction

Reactions in voltaic cells are

non-spontaneous, redox reactions

spontaneous, non-redox reactions

non-spontaneous, non-redox reactions

In which direction does electricity flow in a voltaic cell (battery)?

Electrons flow from anode to cathode

Electrons flow from the cathode to the anode

Electrons flow from left to right

Electrons flow from right to left

Which statement best describes how a salt bridge maintains electrical neutrality in the half-cells of an electrochemical cell?

It permits the migration of ions.

It prevents the migration of electrons.

It prevents the reaction from occurring spontaneously.

It allows for the reaction from occurring spontaneously.

Which of the following is true for an electrolytic cell?

changes electrical energy into chemical energy.

uses an electricity to make a nonspontaneous reaction go

Below shows a cell diagram for voltaic cell. Which of the following is FALSE ?

Copper undergo reduction to form copper ions

Electrons flow from anode to cathode

Zinc undergo oxidation to form Zinc ions

Electrochemistry

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Practice Problem

•

Medium

•

NGSS

HS-PS1-2, HS-PS1-1, HS-PS2-5

Standards-aligned

Ilona Tylina

Used 320+ times

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32 questions

Show all answers

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In the reaction
2Ca(s) + O₂(g) --> 2CaO(s), calcium is __________

Reduced

Synthesized

Oxidized

None of the above

Tags

NGSS.HS-PS1-2

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

What is the oxidation number of Fe in FeO?

-1

-2

Tags

NGSS.HS-PS1-2

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

What is oxidation number of Cr in Cr₂O_7^2-?

-2

+12

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

What is oxidation number of P in K₃PO₄?

-2

Tags

NGSS.HS-PS1-1

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

What is oxidation number of O in O₂ ?

-2

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Which of the following elements does NOT have an oxidation number of +2?

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

In the reaction Zn + H₂O --> ZnO₂ + H₂
which element, if any, is oxidized?

Zinc

Hydrogen

Oxygen

None

Tags

NGSS.HS-PS1-2

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Electrochemistry

32 questions

In the reaction
2Ca(s) + O₂(g) --> 2CaO(s), calcium is __________

What is the oxidation number of Fe in FeO?

What is oxidation number of Cr in Cr₂O_7^2-?

What is oxidation number of P in K₃PO₄?

What is oxidation number of O in O₂ ?

Which of the following elements does NOT have an oxidation number of +2?

In the reaction Zn + H₂O --> ZnO₂ + H₂
which element, if any, is oxidized?

Another name for a "oxidation-reduction" reaction is

How would you write the electrons in the reaction O_{2 -->}O₂^-2?

Is calcium oxidized or reduced in the following reaction?
2CaO--> 2Ca + O₂

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Electrochemistry

32 questions

In the reaction 2Ca(s) + O2(g) --> 2CaO(s), calcium is __________

What is the oxidation number of Fe in FeO?

What is oxidation number of Cr in Cr2O72-?

What is oxidation number of P in K3PO4?

What is oxidation number of O in O2 ?

Which of the following elements does NOT have an oxidation number of +2?

In the reaction Zn + H2O --> ZnO2 + H2 which element, if any, is oxidized?

Another name for a "oxidation-reduction" reaction is

How would you write the electrons in the reaction O2 --> O2-2 ?

Is calcium oxidized or reduced in the following reaction? 2CaO--> 2Ca + O2

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Chemistry

In the reaction
2Ca(s) + O₂(g) --> 2CaO(s), calcium is __________

What is oxidation number of Cr in Cr₂O_7^2-?

What is oxidation number of P in K₃PO₄?

What is oxidation number of O in O₂ ?

In the reaction Zn + H₂O --> ZnO₂ + H₂
which element, if any, is oxidized?

How would you write the electrons in the reaction O_{2 -->}O₂^-2?

Is calcium oxidized or reduced in the following reaction?
2CaO--> 2Ca + O₂