Redox

In which of the following substances does chlorine have an oxidation state of +5?

• NaCl

• NaClO₄

• NaClO3

• NaClO3

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

• Double Replacement
• Neutralization
• Oxidation-Reduction
• Hydrolysis

If an atom loses electrons during a chemical reaction, the atom was:

• Oxidized
• Reduced
• Neutralized
• Precipitated

Tags

NGSS.HS-PS1-2

Which of the following will always have an oxidation number of +1 when in a compound?

• Mg
• Ca
• Na
• S

If an element is reduced in a redox reaction, the number of electrons it has

• Increased

• Decreased

• Remained Constant

• Varies Randomly

As a free element (uncombined), oxygen will have an oxidation number of ?

• +1
• -1
• 0
• +2

What element is being oxidized in the reaction below?

HNO₃ + H₂S --> NO + S + H₂O

• N

• H

• O

• S

Which element in the following reaction is being reduced?

2 Na + CuCl₂ --> 2 NaCl + Cu

• Na

• Cu

• Cl

• This is not a redox reaction

The sum of all oxidation numbers in a neutral compound is ___.

• 0
• 1
• -1
• depends on the compound

Which statement describes the reaction below?

2 Al + 3 Cl₂ --> 2 AlCl₃

• Protons are transferred from aluminum to chlorine.

• Protons are transferred from chlorine to aluminum.

• Electrons are transferred from aluminum to chlorine.

• Electrons are transferred from chlorine to aluminum.