Redox review

Open Ended

Do you know what redox means?

Multiple Choice

Oxidation is the _________ of electrons.

• loss

• gain

• sharing

• transfer

Multiple Choice

Which of the following statements is true about reduction?

• It involves the gain of oxygen.

• It involves the loss of electrons.

• It involves the gain of electrons.

• It involves the loss of hydrogen.

Multiple Choice

Which of the following best describes an oxidising agent?

• A substance that gains oxygen or loses electrons

• A substance that loses oxygen or gains electrons

• A substance that oxidises another substance and itself gets reduced

• A substance that reduces another substance and itself gets oxidised

Multiple Choice

In the reaction Zn + PbO → ZnO + Pb, which substance is oxidized and which is reduced?

• Zn is oxidized, PbO is reduced

• Zn is reduced, PbO is oxidized

• ZnO is oxidized, Pb is reduced

• Pb is oxidized, ZnO is reduced

Multiple Choice

Which of the following statements about the reaction Fe₂O₃ + 3CO → 2Fe + 3CO₂ is correct?

• Fe₂O₃ is oxidized to Fe

• CO is reduced to CO₂

• Fe₂O₃ is reduced to Fe

• CO₂ is oxidized to CO

Multiple Select

Select all reactions where a metal oxide is reduced to a metal.

• Zn + PbO → ZnO + Pb

• 2CuO + C → 2Cu + CO₂

• Fe₂O₃ + 3CO → 2Fe + 3CO₂

• H₂O + Mg → MgO + H₂

Open Ended

Explain how the transfer of oxygen is used to identify oxidation and reduction in chemical reactions. Use examples from the images to support your answer.

Multiple Choice

Which of the following reactions demonstrates both oxidation and reduction?

• Zn + PbO → ZnO + Pb

• 2CuO + C → 2Cu + CO₂

• Fe₂O₃ + 3CO → 2Fe + 3CO₂

• All of the above

Multiple Choice

Which process involves the gain of oxygen and which involves the loss of oxygen in the reaction H2O(g) + Mg → MgO + H2?

• Oxidation involves gain of oxygen, reduction involves loss of oxygen

• Oxidation involves loss of oxygen, reduction involves gain of oxygen

• Both involve gain of oxygen

• Both involve loss of oxygen

Multiple Select

Which of the following statements are correct about oxidation and reduction based on electron transfer?

• Oxidation is the loss of electrons

• Reduction is the gain of electrons

• Oxidation is the gain of electrons

• Reduction is the loss of electrons

Open Ended

Explain how the transfer of electrons between magnesium and oxygen leads to the formation of an ionic bond.

Open Ended

Describe the relationship between oxidation, reduction, and redox reactions using the equations provided in the electron transfer slides.

Multiple Choice

What is the overall equation for the reaction between magnesium and oxygen as shown in the electron transfer diagrams?

• 2Mg + O2 → 2MgO

• Mg + O2 → MgO2

• Mg + O → MgO

• 2Mg + 2O2 → 2MgO2

Multiple Choice

Which process involves the loss of electrons?

• Oxidation

• Reduction

• Precipitation

• Neutralization

Multiple Choice

In the reaction Cu2+ + Mg → Cu + Mg2+, which species is oxidized and which is reduced?

• Cu2+ is reduced, Mg is oxidized

• Cu2+ is oxidized, Mg is reduced

• Both are oxidized

• Both are reduced

Multiple Select

Select all correct statements about oxidation and reduction based on the diagrams shown.

• Oxidation is the loss of electrons

• Reduction is the gain of electrons

• Oxidation state increases during oxidation

• Reduction involves the loss of electrons

Open Ended

Explain how electron transfer occurs in the reaction Zn + 2H+ → Zn2+ + H2. What happens to zinc and hydrogen ions?

Multiple Choice

Which of the following elements has an oxidation state of 0 in its elemental form?

• Mg

• F2

• O2

• All of the above

Multiple Choice

Which of the following best describes the oxidation state in a compound?

• It is always positive.

• It corresponds to charges in a compound.

• It is always negative.

• It is the number of protons in an atom.

Multiple Choice

Based on the compounds MgCl2 and NH3, what is the total oxidation state of each compound?

• +2 for both

• 0 for both

• -2 for both

• +1 for both

Multiple Choice

Which of the following statements is correct regarding oxidation and reduction?

• A rise in oxidation number means reduction.

• A fall in oxidation number means oxidation.

• A rise in oxidation number means oxidation.

• Oxidation and reduction do not involve changes in oxidation number.

Multiple Choice

In the redox equation shown, which element is reduced and which is oxidized?

• Fe is reduced, C is oxidized

• Fe is oxidized, C is reduced

• Both Fe and C are oxidized

• Both Fe and C are reduced

Multiple Choice

$$Mg+2\ HCl\rightarrow MgCl_2+H_2$$
Mg is

• oxidized

• reduced

• a spectator ion

Multiple Choice

In the reaction $$2K + Br_2 \rightarrow 2KBr$$ , which element is reduced?

• Potassium (K)

• Bromine (Br_2)

• Potassium bromide (KBr)

• None of the above

Match

Determine the Oxidation State for each of the following

• Mg²⁺

• Cl

• Cl in NaCl

• S in LiHSO₄

• O in H₂O

+2

0

-1

+6

-2

• +2

• 0

• -1

• +6

• -2

Multiple Choice

What is the oxidation number of Cr in Cr₂O₇^2- ?

• +14

• +6

• -6

• -14

Multiple Choice

What is the term used for a substance that donates electrons in a redox reaction?

• Oxidising agent

• Reducing agent

• Catalyst

• Inhibitor

Multiple Choice

Combustion and single-replacement reactions are __________ redox reactions.

• always

• never

• sometimes

• mostly

Dropdown

In redox reactions the involve loss and gain of electrons,

oxidation is defined as ​

Select answer

while reduction is defined as ​

Select answer

Multiple Choice

Which of the following best describes a reducing agent?

• A substance that gains oxygen

• A substance that loses electrons

• A substance that reduces another substance and itself gets oxidised

• A substance that oxidises another substance and itself gets reduced

Multiple Choice

What element is being Oxidized?

• N
• H
• O
• S

Multiple Choice

What element is being Oxidized?

• I
• H
• S
• O