Oxidation numbers

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

• Double Replacement
• Neutralization
• Oxidation-Reduction
• Hydrolysis

Which of the following compounds is NOT an ionic compound?

• NaCl
• NH₃
• Fe₂O₃
• HCl

What is the oxidation of C in CH₄?

• -4
• -1
• +4
• +1

What element's don't have oxidation numbers?

• alkali metals
• noble gases
• halogens
• alkaline earth metals

What is oxidation number of Mn in MnO₂ ?

• 0
• +2
• -2
• +4

What is the oxidation number of Ca in Ca₃N₂?

• +3
• +2
• -3
• -2

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

• -2
• +2
• +6
• +12

What is oxidation number of P in K₃PO₄?

• +1
• +5
• -2
• 0

What are oxidation numbers?

• Number of electrons in the outer most energy level
• Number of protons
• Electrons gained or lost in chemical bonding
• Number of neutrons gained or lost

What are valence electrons?

• Number of electrons in the outer most energy level
• Number of electrons gained or lost
• Number of electrons in the inner energy level
• Number of electrons