Redox Day 1

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 half-reaction correctly represents reduction?

• Ag --> Ag⁺ + e^-

• F₂ --> 2 F^- + 2e^-

• Au³⁺ + 3e^- --> Au

• Fe²⁺ + e^- --> Fe³⁺

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

• redox
• reduction
• oxidation
• neutralization

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the oxidation number of carbon in NaHCO3?

• +1
• +4
• -4
• +6

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

• -2

• +2

• +6

• +12

Tags

NGSS.HS-PS1-2

Which change is reduction?

• change 1
• change 2
• neither

Tags

NGSS.HS-PS1-2

A chemical reaction that involves a gain/loss of electrons is called:

• Double Replacement
• Neutralization
• Oxidation-Reduction
• Hydrolysis

What is an oxidation number?

• Number of electrons in the outer most energy level

• Number of protons

• Charge on an tom when combined with others

• Number of neutrons gained or lost