WorksheetsOxidation and Reduction
Total questions: 20
Worksheet time: 10mins
What is the oxidation number of an element in its elemental form?
2
-1
0
1
Define a redox reaction.
A redox reaction involves the transfer of neutrons between two species.
A redox reaction involves the transfer of protons between two species.
A redox reaction involves the transfer of electrons between two species.
A redox reaction involves the transfer of energy between two species.
How do you balance a redox equation?
By adding random coefficients to the equation
By flipping the equation upside down
By balancing the atoms and charges on both sides of the equation.
By counting the number of vowels in the equation
What is an oxidizing agent?
A substance that can accept electrons from another substance, causing the other substance to be oxidized.
A substance that speeds up a chemical reaction without being consumed.
A substance that remains unchanged in a chemical reaction.
A substance that can donate electrons to another substance, causing the other substance to be reduced.
Provide an example of a reducing agent.
Potassium permanganate
Hydrogen peroxide
Sodium borohydride (NaBH4)
Sodium chloride
What is the oxidation number of oxygen in most compounds?
+2
-1
0
-2
Explain the concept of oxidation numbers.
Oxidation numbers are used to determine the color of a chemical compound
Oxidation numbers are assigned to atoms in a chemical compound or ion to indicate the electron distribution around the atom. It is a measure of the atom's ability to attract or lose electrons in a chemical reaction.
Oxidation numbers represent the number of protons in an atom
Oxidation numbers are only applicable to organic compounds
What happens to the oxidation number of an element in a reduction reaction?
It remains the same
It increases
It decreases
It fluctuates
Why is it important to balance redox equations?
To add unnecessary complexity to the reaction
To confuse students studying chemistry
To ensure conservation of charge and mass in the reaction.
To waste time without any benefit
Identify the reducing agent in the reaction: Zn + CuSO4 -> ZnSO4 + Cu
Na
Ag
Zn
Fe
In the reaction: 2K + Cl2 -> 2KCl, what is being oxidized?
Potassium (K)
Potassium chloride (KCl)
Chlorine (Cl)
Potassium chloride (K2Cl)
What is the reducing agent in the reaction: 2FeCl3 + H2S -> 2FeCl2 + 2HCl + S
HCl
FeCl3
H2S
FeCl2
Balance the following redox equation: H2 + O2 -> H2O
2H2 + O2 -> H2O2
H2O -> H2 + O2
2H2 + O2 -> 2H2O
H2O2 -> H2 + O2
What is the oxidizing agent in the reaction: 2Mg + O2 -> 2MgO
Hydrogen peroxide
Carbon dioxide
Magnesium
Oxygen (O2)
In the reaction: 2Na + Cl2 -> 2NaCl, what is being reduced?
Sodium (Na)
Chlorine (Cl)
Sodium chloride (NaCl)
Oxygen (O)
Explain the role of electrons in redox reactions.
Electrons are consumed in redox reactions
Electrons have no impact on redox reactions
Electrons are only involved in oxidation reactions
Electrons transfer between reactants, causing oxidation and reduction.
Identify the oxidizing agent in the reaction: 2Fe + 3Cl2 -> 2FeCl3
Fe
FeCl3
Cl2
Fe2Cl3
Balance the following redox equation: Fe + HCl -> FeCl3 + H2
2HCl + Fe -> FeCl3 + 2H2
3HCl + Fe -> FeCl3 + H2
6HCl + Fe -> FeCl3 + 3H2
6HCl + 2Fe -> 2FeCl3 + 3H2
What is the oxidation number of hydrogen in most compounds?
+2
+1
0
-1
Define the term 'redox'.
A chemical reaction where one substance is oxidized and another is reduced.
A type of dance move
A type of rock formation
A type of fish commonly found in oceans
