Redox review

Zinc reacts with steam to form zinc oxide and hydrogen. 
Zn + H₂O ------> ZnO + H₂   During the reaction, which substance is oxidised?  

• hydrogen  
• water  
• zinc            
• zinc oxide

Which equation shows an oxidation reaction?

• A
• B
• C
• D

Tags

NGSS.HS-PS1-2

This is the half reaction for: 
Sn(s) → Sn⁴⁺(aq) + 4e⁻

• redox
• reduction
• oxidation
• neutralization

Which change is reduction?

• change 1
• change 2
• neither

Tags

NGSS.HS-PS1-2

What is the oxidation number of carbon in NaHCO3?

• +1
• +4
• -4
• +6

What type of reaction is the following? 
Zn_(s) + 2Cu(NO₃)_2(aq) ---> 2Cu_(s) + Zn(NO₃)_2(aq)

• double displacement
• single displacement
• precipitation
• neutralization

Sodium reacts with sulphur to form sodium sulphide.  
2Na + S →Na₂S This is an example of:

• decomposition
• synthesis
• single  replacement
• precipitation

Which expression represents the oxidation of the copper(I) ion?

• Cu⁺---->  Cu²⁺ + e^–  
• Cu ----> Cu⁺ + e^– 
• Cu⁺ + e^– ----> Cu⁰
• Cu⁺ + e^– ----> Cu²⁺

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

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

• Oxidized
• Reduced

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⁺