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WorksheetsMasterChempro
Total questions: 33
Worksheet time: 1hrs 9mins
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Given the following balanced equation :
2NO(g) + Cl2(g) → 2NOCl(g)
If the rate of disappearance of Cl2 is 4.84 x 10-2 Ms-1, what is the rate of disappearance of NO?
1.45 x 10-2 Ms-1
2.42 x 10-2 Ms-1
3.67 x 10-2 Ms-1
9.68 x 10-2 Ms-1
In the chemical reaction, the successful formation of products depends on the following factors EXCEPT:
The collisions between reacting molecules must be effective
The colliding molecules must approach each other in the right orientation
The energy of colliding molecules must be equal to or more than activation energy
A collision between molecules must have energy less than activation energy
For second order reaction, the initial concentration of reactant A is 0.24 M. If the rate constant is 8.1 x 10-2 M-1 s-1, what is the concentration of A after 29 seconds?
0.02 M
0.15 M
0.30 M
0.45 M
The reaction A + 2B → products was found to have the rate law, Rate = k[A][B]2. Predict by what factor the rate of reaction will increase when the concentration of B is doubled and the concentration of A remained unchanged
2
4
6
8
The first order rate constant for the decomposition of 0.5 M compound A at 100oC is 0.03 min-1. Calculate the half-life of A.
1.5 min
8.3 min
23.1 min
66.7 min
The enthalpy of formation is the enthalpy change
when one mole of the pure compound is formed from its elements under standard conditions
when 1 mole of pure substance is completely burned in excess oxygen, under the given temperature and pressure of the reaction
when 1 mole of H+ (aq) ions from acid reacts with 1 mole of OH- (aq) ions from an alkali to form 1 mole of water under the stated condition of the experiment
the magnitude of the enthalpy change of a chemical reaction depends only on the difference in the enthalpy content of the products and the reactants, and does not on how the reaction is completed
Which of the following equations represents the enthalpy change of combustion?
2C4H10(g) +13O2(g) → 8CO2 (g) + 10H2O(g)
C4H10(g) +13/2O2(g) → 4CO2 (g) + 5H2O(g)
C4H10 + 9/2O2 = 4CO (s)+ 5H2O
C4H10 + 5/2O2 = 4C(s) + 5H2O(g)
Calculate the enthalpy change represented by X
+695kJ/mol
-695kJ/mol
-635kJ/mol
-635kJ/mol
If the specific heat of water is 4.18 J/g∙°C, how much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C?
-80,256 J
80.256 J
80,256 J
-80.256 J
4 NH3 (g) + 5 O2 (g) ⟶ 4 NO (g) + 6 H2O (g)
Using the following information, calculate ΔH for the reaction shown above:
N2 (g) + O2 (g) ⟶ 2 NO (g) ΔH = -180.5 kJ
N2 (g) + 3 H2 (g) ⟶ 2 NH3 (g) ΔH = -91.8 kJ
2 H2 (g) + O2 (g) ⟶ 2 H2O (g) ΔH = -483.6 kJ
256.0 kJ
-1628.2 kJ
-6387 kJ
+1628.2 kJ
The standard reduction potential for several half-reactions at 298K are shown below. Which of the following species is the strongest oxidising agent?
X⁻
Y³⁺
Z
X₂
Given standard reduction potential for half reactions below. Based on above data, which of the following statements is/are correct?
I. Magnesium is the strongest reducing agent
II. The reaction 2Fe²⁺ + Br₂ → 2Fe³⁺ + 2Br⁻ can occur spontaneously.
III. The standard e.m.f for the cell Mg(s) | Mg²⁺(aq) || Ni²⁺(aq) | Ni(s) is +2.12V
I only
I and II only
II and III only
I, II and III only
Consider a voltaic cell in which the reaction is
Zn(s) + 2H⁺ (aq) → Zn²⁺ (aq) + H₂ (g)
It is found that the cell voltage is + 0.560 when [Zn²⁺] = 1.0 M, P H₂ = 1.0 atm. Determine the concentration of H⁺? Given standard reduction potential for H⁺|H₂ = 0 and Zn²⁺|Zn = -0.762 V
+0.762 M
3.87 M
3.87 x 10⁻⁴ M
1.0 x 10⁻⁴ M
Choose the correct statement about electrolysis of aqueous sodium sulphate, Na₂SO₄.
I. At cathode, water is preferentially discharged.
II. Hydrogen gas is produced at anode
III. SO₄⁻ ions are not selected to be oxidised due to S already in its highest oxidation state.
IV. Bubble gas of oxygen evolved at anode
I and III only
I, III and IV
II and III only
II, III and IV
Chromium metal can be electroplated from an aqueous solution of potassium dichromate. The reduction half reaction is
Cr₂O ²⁻ (aq) + 14H⁺ (aq) + 12e⁻ ⟶ 2Cr (s) + 7H₂O (l)
How many grams of chromium will be plated by 1.00 x 10⁴ C? [Ar Cr: 52.0]
0.1036 g
0.0173 g
0.8980 g
5.3872 g
Which of the following is the most probably a cyclic alkane?
C₄H₁₀
C₅H₁₀
C₆H₁₀
C₆H₆
A compound that is wrongly named 3,3,4-trimethylbutane. Identify the correct name for this compound.
2-methylpentane
3,3-dimethylpentane
2-methylhexane
Hexane
Boiling point of alkanes are varies based on strength of intermolecular forces. Arrange these alkanes according to decreasing boiling point; pentane, 2,2-dimethylpropane, hexane, 2-methylbutane
2,2-dimethylpropane > 2-methylbutane > pentane > hexane
hexane > 2,2-dimethylpropane > 2-methylbutane > pentane
hexane > pentane > 2-methylbutane > 2,2-dimethylpropane
hexane > pentane > 2,2-dimethylpropane > 2-methylbutane
Ethane undergoes bromination in presents of sunlight to produce alkyl halide. Identify incorrect statement about this reaction.
Chemical equation: CH₃CH₃ + Br₂/CH₂Cl₂ + uv ⟶ CH₃CH₂Br + HBr
The reddish brown colour of bromine turn colourless after the reaction has finished.
Mechanism of free radical substitution (Termination step): CH₃CH₂. + CH₃CH₂. ⟶ CH₃CH₃CH₃CH₃
Mechanism of free radical substitution (Propagation step): CH₃CH₃ + Cl. ⟶ CH₃CH₂. + HCl
. The combustion reaction of propane is carried out under excess oxygen and then under limited oxygen. Which chemical equation is not related to this reactions/
CH₃CH₂CH₃ + 3O₂ ⟶ 3CO₂ + 4H₂
CH₃CH₂CH₃ + 2O₂ ⟶ 3CO₂ + 4H₂O
CH₃CH₂CH₃ + 7/2 O₂ ⟶ 3CO + 4H₂O
CH₃CH₂CH₃ + 2O₂ ⟶ 3C + 4H₂O
Name the compound
cis-4-heptene
trans-4-heptene
cis-3-heptene
trans-3-heptene
Which rule states that....
"Elimination reaction will give an alkene with the most
highly substituted double bond as the major product"
Hund's rule
Saytzeff’s Rule
Markovnikov's rule
Huckel's rule
What is the general formula for alkenes?
CnH2n
CnH2n+2
CnH2n-2
CnH2n-6
Which chemical test can be used to differentiate
cyclohexene and cyclohexane?
Chlorine test
Baeyer's Test
Fehling's Test
Nitrous acid test
What is the product formed when propene react with
cold dilute potassium permanganate solution?
propanol, CH3CH2CH2OH
propanoic acid, CH3CH2COOH
propane, CH3CH2CH3
propanediol, CH2(OH)CH(OH)CH3
What is the type of reaction for benzene?
Elimination reaction
Electrophilic aromatic substitution reaction
Electrophilic additon reaction
Nucleophilic substitution reaction
Name the compound
2-methyl-1-hydroxybenzene
1-methyl-2-hdroxybenzene
1,2-hydroxytoluene
2-methylphenol
What is the product formed when
What is the product formed when
what is the function of Lewis Acid in benzene reaction?
to Increase polarity of halogen molecules
as a source of energy for cleavage to occurs
to produce negative ions benzene to react
to break the polar bonds between
C-X
