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WorksheetsChemical Reactions And Equations_LS_15_2
Total questions: 50
Worksheet time: 25mins
Zinc oxide reacts with carbon, on heating, to form zinc metal and carbon monoxide. Write a balanced chemical equation for this reaction.
ZnO + C +Heat
→ Zn + CO
ZnO(s)+2NaOH(aq.)→Na2ZnO2(aq.)+H2O(l)
2HCl+ZnO→ZnCl2+H2O
Zn + CuO → ZnO + Cu
Zinc oxide reacts with carbon, on heating, to form zinc metal and carbon monoxide. Name (i) oxidising agent,
ZnO(s)+C(s)+Heat⟶Zn(g)+CO(g)
Zinc oxide.
Hydrogen peroxide
Potassium dichromate
Sodium or calcium hypochlorite
Zinc oxide reacts with carbon, on heating, to form zinc metal and carbon monoxide. Name (ii) reducing agent, in this reaction.
ZnO(s)+C(s)+Heat⟶Zn(g)+CO(g)
Carbon.
Glucose.
Sodium sulfite.
Sodium thiosulfate
A chemical change in which two substances react to form a new substance is a ____________________________.
decomposition reaction
Combination reaction
precipitation reaction
combustion reaction
2 Cu (s) + O2 (g) ---> 2 CuO (s)
Combustion
single replacement
double replacement
decomposition
Combination
CuO+H2⟶Cu+H2O
Combustion
single displacement
double displacement
decomposition
Combination
Those reactions in which one element takes the place of another element in a compound, are known as _______ .
Equation: CuSO4 (aq)+ Zn (s)—–>ZnSO4+ Cu
Combustion
single displacement
double displacement
decomposition
Combination
Those reactions in which two compounds react by an exchange of ions to form two new compounds are called ________ reactions.
Equation: AgNO3 (aq) + NaCl (aq)—–>AgCl (s)+ NaNO3 (aq)
Combustion
Single displacement
Double displacement
Decomposition
Combination
Any reaction in which an insoluble solid (called precipitate) is formed that separates from the solution is called a _______
Combustion
Displacement
Decomposition
Combination
Precipitation
BaCl2(aq)+ Na2SO4(aq) → BaSO4(s) + 2NaCl(aq)
Barium sulphate is insoluble in water and will precipitate as a white solid.
This reaction is an example of a ________ reaction.
Combustion
Single displacement
Double displacement
Decomposition
Combination
Barium chloride on reacting with sodium sulphate forms barium sulphate and sodium chloride.
BaCl2(aq)+ Na2SO4(aq) → BaSO4(s) + 2NaCl(aq)
Type of reaction:
Combustion
Single displacement
Double displacement
Decomposition
Combination
(a) is the gain of oxygen atoms.
(a) is the loss of oxygen atoms.
Is this an oxidation or reduction reaction?
carbon + oxygen → carbon dioxide
Oxidation
Reduction
Is this an oxidation or reduction reaction?
water → hydrogen + oxygen
Oxidation
Reduction
Which of these metals do not form an ore?
Copper
Gold
Iron
Magnesium
Which element has been oxidised?
iron oxide + lithium → iron + lithium oxide
iron
lithium
oxide
lithium oxide
Which element has been reduced?
iron oxide + lithium → iron + lithium oxide
iron
lithium
oxide
iron oxide
Balance the following displacement reaction.
Li2O + (a) K → K2O + 2Li
Define the following in terms of gain or loss of hydrogen with one example each :(i) oxidation. What is the first statement of the audio clip?
Oxidation is the gain of oxygen.
Oxidation is the loss of hydrogen.
Oxidation is loss of electrons
Remember the acronym OIL which means oxidation is loss.
Define the following in terms of gain or loss of hydrogen with one example each :(i) oxidation. What is the second statement of the audio clip?
Oxidation is the gain of oxygen.
Oxidation is the loss of hydrogen.
Oxidation is loss of electrons
Remember the acronym OIL which means oxidation is loss.
Define the following in terms of gain or loss of hydrogen with one example each :(i) oxidation. What is the third statement of the audio clip?
Oxidation is the gain of oxygen.
Oxidation is the loss of hydrogen.
Oxidation is loss of electrons
Remember the acronym OIL which means oxidation is loss.
Define the following in terms of gain or loss of hydrogen with one example each :(i) oxidation. What is the fourth statement of the audio clip?
Oxidation is the gain of oxygen.
Oxidation is the loss of hydrogen.
Oxidation is loss of electrons
Remember the acronym OIL which means oxidation is loss.
In the reaction of formation of magnesium oxide magnesium undergoes ________
a) reduction
b) oxidation
c) hydrogenation
d) decomposition
(a) Define the following in terms of gain or loss of hydrogen with one example each : (ii) reduction
What is the first statement of the audio clip?
Reduction reactions involve:
Addition of hydrogen:
Addition of electropositive element:
Removal of oxygen
Removal of electronegative element
Reducing agent is a substance which brings about reduction.
(a) Define the following in terms of gain or loss of hydrogen with one example each : (ii) reduction
What is the second statement of the audio clip?
A very clever mnemonic to remember this concept is RIG (Reduction is gain)
Addition of electropositive element:
Removal of oxygen
Removal of electronegative element
Reducing agent is a substance which brings about reduction.
(a) Define the following in terms of gain or loss of hydrogen with one example each : (ii) reduction
What is the third statement of the audio clip?
A very clever mnemonic to remember this concept is RIG (Reduction is gain)
Addition of electropositive element:
Removal of oxygen
Removal of electronegative element
Reducing agent is a substance which brings about reduction.
(a) Define the following in terms of gain or loss of hydrogen with one example each : (ii) reduction
What is the fourth statement of the audio clip?
A very clever mnemonic to remember this concept is RIG (Reduction is gain)
Addition of electropositive element:
Removal of oxygen
Removal of electronegative element
Reducing agent is a substance which brings about reduction.
(a) Define the following in terms of gain or loss of hydrogen with one example each : (ii) reduction
What is the fifth statement of the audio clip?
A very clever mnemonic to remember this concept is RIG (Reduction is gain)
Addition of electropositive element:
Removal of oxygen
Removal of electronegative element
Reducing agent is a substance which brings about reduction.
(a) Define the following in terms of gain or loss of hydrogen with one example each : (ii) reduction
What is the sixth statement of the audio clip?
A very clever mnemonic to remember this concept is RIG (Reduction is gain)
Addition of electropositive element:
Removal of oxygen
Removal of electronegative element
Reducing agent is a substance which brings about reduction.
Redox reactions are oxidation-reduction chemical reactions.
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
All the redox reactions can be broken down into _________ different processes
4
3
2
1
The substance getting reduced in a chemical reaction is known as the ?
A. reducing agent
B. oxidizing agent
C. redox agent
D. None of the above
Fe2O3 + 3CO → 2Fe + 3 CO2
Is what kind of reaction?
The iron oxide undergoes reduction (loses oxygen) to form iron. Therefore it is a reduction reaction
while the carbon monoxide is oxidized (gains oxygen) to form carbon dioxide. Therefore it is an oxidation reaction.
Which kind of reaction involves the breakdown of a compound into different compounds?
A. Combination Reaction
B. Displacement Reaction
C. Disproportionation Reactions
D. Decomposition Reaction
2 Fe + O2 → Fe2O3
Oxidation
Reduction
C + O2 → CO2
Oxidation
Reduction
Fe + S → FeS
Addition of an electronegative element
Oxidation
Reduction
Removal of an electropositive element
2 KI + H2O2 → I2 + 2 KOH
Oxidation
Reduction
Addition of hydrogen
N2 + 3 H2 → 2 NH3
Oxidation
Reduction
Removal of oxygen
ZnO + C → Zn + CO
Oxidation
Reduction
H2S + Cl2 → 2HCl + S
Element Sulphur has undergone?
Oxidation
Reduction
Redox
H2S + Cl2 → 2HCl + S
Element Chlorine has undergone?
Oxidation
Reduction
Redox
H2S + Cl2 → 2HCl + S
This is a ______ reaction
Oxidation
Reduction
Redox
CuO + H2 → Cu +H2O
In CuO to Cu since Oxygen is getting removed; therefore Copper is undergoing ______
Oxidation
Reduction
Redox
CuO + H2 → Cu +H2O
H2 is undergoing _______; to become H2O.
Oxidation
Reduction
Redox
CuO + H2 → Cu +H2O
This is a _______ reaction
Oxidation
Reduction
Redox
MnO4-+ I- → MnO2 + I2
Here I- is undergoing _____ to I2
Oxidation
Reduction
Redox
MnO4-+ I- → MnO2 + I2
Here MnO4 - is undergoing _______ to MnO2.
Oxidation
Reduction
Redox
MnO4-+ I- → MnO2 + I2
This is ia ______ reaction
Oxidation
Reduction
Redox
