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WorksheetsGeneral Chemistry I Quiz
Total questions: 71
Worksheet time: 38mins
The order of a reaction is defined as?
the sum of the concentrations in the rate law
the sum of the powers of the concentration in the rate law
the sum of the concentrations in the reaction equation
the number of reactant molecules involved in a reaction
Which of the following is true of the definition of the standard heat of formation of a compound?
amount of heat absorbed or evolved in a reaction
is the change in enthalpy that takes place when a compound is formed from its gaseous ions
enthalpy that takes place when one mole of a compound is formed from its element, all substances at 50oC and and 1 atm pressure
enthalpy that takes place when one mole of a compound is formed from its element, all substances at 25oC and and 1 atm pressure
The following are true of molecularity of a reaction except?
It is always a whole number
it's invariant of reaction condition for a given chemical equation
It can assume zero value
it's a theoretical concept
Calculate the average rate over the first 50 s in the experimental data below.
The rate of a chemical reaction depends on the following except?
the presence of a catalyst
the concentrations (or pressures) of the reacting species
the shape of the reacting molecules
nature of the reacting species
The change in enthalpy that occurs when 1 mole of a solid crystalline substance is formed from its gaseous ions is termed?
lattice energy
heat of combustion
heat of formation
standard heat of formation
Consider the reaction: 4N02(g) + O2(g) ⟶ 2N2O5(g). Suppose that at a particular moment during the reaction molecular oxygen is reacting as the rate of 0.0024Ms-1. At what rate is N2O5 being formed?
0.0011 M/s
0.0015 M/s
0.0006 M/s
0.0048 M/s
The order of reaction?
1
3
0
2
The rate law is?
k[S2O82-][I‾]
k[S2O82-]2
k[S2O82-]2[I‾]
k[S2O82-][I‾]2
The order the reaction with respect to is S2O82-?
½
0
2
1
The order the reaction with respect to is I‾?
1
½
2
0
The reaction rate constant, k, is?
0.08 M-2 s-1
0.08 M-1 s-1
2.1 M-2 s-1
2.1 M-1 s-1
Calculate the half-life of the reaction if the initial concentration of I is 0.6 M?
1.2 × 10-10 M
6 × 10-10 M
4 × 10-10 M
2.4 × 10-10 M
The following is true of zero order reaction except?
It is peculiar to liquid reactants
It does not depend on the concentration of the reactant
a reactant whose concentration does not affect the reaction rate is not included in a rate law
Its half-life is [A]o/2k ([A]o = initial concentration of the reactant; k = the reaction rate constant)
For the reaction, Kc is?
[SO3]2[SO2]2[O2]
[SO2]3[SO3]2[O2]
[SO2]2[O2][SO3]2
[SO3]3[SO2]3[O2]
What is the value of Kc for this reaction N2 + 3H2 2NH3 if the initial amount of N2 is a moles, H2 is b moles and N2 reacted is x moles?
2x23(b-x)3(a-x)
4x23(b-x)3(a-x)
4x2(3b-x)3(a-x)
2x2(3b-x)3(a-x)
Calculate Kp for the reaction H2 + I2 2HI if the partial pressures of H2, I2 and HI are 0.0592, 0.1183 and 0.1106 respectively?
0.17
1.17
1.71
1.75
If the partial pressure of H2O(g) in a 0.5 L container at 500 0C is 0.0592 atm, what is its concentration? R = 0.08206 Latm/Kmol?
0.009
0.0009
0.09
0.00009
If [CO] = 0.05M at 25 0C, its partial pressure is?
0.122
1.22
12.22
0.0122
Consider this exothermic reaction; N2 + 3H2 2NH3 ∆H = +26 kJ. Addition of H2 will shift the reaction?
Right
left
no effect
at equilibrium
A decrease in temperature will shift the reaction?
Right
left
no effect
at equilibrium
Addition of catalyst will shift the reaction?
Right
left
no effect
at equilibrium
An increase in pressure will shift the reaction?
Right
left
no effect
at equilibrium
Increase in volume will shift the reaction?
Right
left
no effect
at equilibrium
Removal of NH3 will shift the reaction?
Right
left
no effect
at equilibrium
Addition of H2O will shift the reaction?
Right
left
no effect
at equilibrium
An acid is a proton donor is defined by?
Arrhenius
Lewis
Bronsted
Lowry
In this reaction, H2O + NH3 H3O+ + NH2-, the respective acid and conjugate base are?
H2O and NH3
NH3 and NH2-
H3O+ and NH3
H2O and NH2-
All these are examples of Lewis acids except?
AlCl3
CO2
H2O
Ca2+
Acidic buffer can be prepared using solutions of?
CH3COOH and NaOH
NH3 and NH4Cl
CH3COOH and CH3COONa
Na2HPO4 and NaH2PO4
The pH of 0.005M NaOH is?
11.7
2.3
5.7
9.3
What is [H+] if the pH is 2.5?
0.039M
0.032M
0.0032M
0.0039M
What is the wavelength of a beam of protons having a velocity of 13.8 x 106 cm/s? The mass of the proton is 1.67 x 10-24 g?
28.8 x 10-11 m
28.8 x 10-12 m
28.8 x 10-13 m
28.8 x 10-14 m
Which of the quantum numbers describes the orbital orientation?
Principal
Subsidiary
Magn
Which of the quantum numbers describes the orbital orientation?
Principal
Subsidiary
Magnetic
Spin
Which of the quantum numbers describes the energy of the orbital?
Principal
Subsidiary
Magnetic
Spin
The condition required for corrosion to take place is the presence of
water and carbon (iv) oxide
water, carbon (iv) oxide and oxygen
oxygen and carbon (iv) oxide
water and oxygen
Both the momentum and the position of a small particle cannot be known simultaneously with any degree of certainty. This is a statement of
Hund
Pauli
Aufbau
Heisenberg
The orbitals of lower energy are filled with electrons first before filling the higher energy. This is a statement of
Hund
Pauli
Aufbau
Heisenberg
No two electrons in an atom can have the same set of four quantum numbers. This is a statement of
Hund
Pauli
Aufbau
Heisenberg
How many unpaired electrons are in the p-orbitals of an oxygen atom?
3
0
1
2
The coloured nature of transition metal ions is associated with their partially filled
f-orbital
s-orbital
p-orbital
d-orbital
Moving from left to right across a period, the general rise in the first ionization energy can be attributed to the
decrease in nuclear charge
increase in nuclear charge
decrease in screening effect
increase in screening effect
0.1Faraday of electricity was passed through a solution of Magnesium (II) sulphate. The mass of Magnesium deposited on the cathode would be
24.0g
12.0g
6.0g
1.2g
What quantity of electricity is consumed when 1 ampere was consumed in 1 hour during electrolysis?
3.6 kilo coulombs
360 coulombs
720 coulombs
7.2 kilo coulombs
If a given quantity of electricity liberates 2.01g of Hg2+, what amount of Zn2+ would be liberated by the same quantity of current?
1.00g
0.65g
4.02g
8.04g
How long would it take to deposit 0.08g of Magnesium from MgCl2 solution by passing a current of 0.5A?
6 mins
8 mins
24 mins
48 mins
The characteristics of molecularity of a reaction are the following except
It is a theoretical concept
It is always a whole number
It can have Zero value
It is invariant of reaction conditions for a given chemical equation
The chemical equilibrium cannot be changed by this factor
Effect of temperature change
Effect of catalyst
Effect of change in volume
Effect of change in pressure
Ionic equilibrium is the equilibrium between
ionized molecules and ions in a solution of strong electrolyte
ionized molecule and H+ in a solution of weak electrolyte
unionized molecules and ions in a solution of weak electrolyte
unionized molecule and ions in a solution of strong electrolyte
How many moles of Mg are there in 2.5 kg of magnesium (Mg = 24.31g/mol)?
0.5 mol
24.31 mol
0.103 mol
60.57 mol
A hydrocarbon was found to contain 83.7% by mass of carbon and 16.3% by mass of hydrogen. What is the empirical formula of the hydrocarbon?
C4H11
C5H12
C3H7
C4H10
What is the % by mass of chlorine in the compound C14H9Cl15?
50%
62%
38%
795
An organic compound with a molecular weight of 60 has an empirical formula CH2O. Determine the molecular formula.
C3H6O
C5H2O
C2H4O2
C4H8O
Calculate the mass of Na2S needed if a solution containing 2 g of Hg(NO3)2 was added to Na2S solution.
78 g
15g
42 g
157 g
What is the number of moles of silver nitrate formed when a current of 0.3A is passed through a silver nitrate solution for 30 minutes?
5.59 X 10-3
2.85 X 10-1
7.14 X 10-5
4.91 X 10-3
What is the time required to pass one faraday of electricity through a solution with a current of 0.3A?
225.5 s
156.2 s
275.7 s
95.3 s
What is the dimension of force?
Kg/s2m
gm/s2
Kgm-3
kgm/s2
Express 7.8x10-7m in nanometer.
0.78nm
78nm
0.078nm
7.8nm
Find the volume in litres of 20kg of CCL4, whose density is 1.60g/cm3.
12.5 L
25 L
2.5 L
0.25 L
What is the mass concentration of 4g of NaOH dissolved in 100ml of distilled water?
0.04 g/dm3
4.0 g/dm3
40 g/dm3
0.4g/dm3
One mole of a compound MHCO3 has a mass of 84g calculate the relative atomic mass of M.
61
42
26
23
What is the empirical formula of an organic compound containing 40% carbon and 6.67% hydrogen by mass?
CH2
CH3
CH2O
CH3O
In the reaction CaC2(s) + 2H2O(l) Ca(OH)2(s) + C2H2(g). what is the mass of solid CaC2 needed to produced 5.6 dm3 of ethyne at S.T.P?
8g
9g
16g
18g
How many grams of HCl will be required to react with 5g of NaOH?
10.1g
4.6g
9.2g
18.4g
What is the number of moles of the Hydrocarbon?
2.5
0.25
0.0025
0.025
What is the relative molar mass of the hydrocarbon?
25
28
30
40
What is the molecular formula of the hydrocarbon?
C2H2
C3H4
C2H6
C2H4
How many moles of glucose C6H12O6 are there in 1.09 g of the substance?
0.00556
0.0245
2.45
0.245
How many moles of NH3 gas are there in 500 cm3 of the gas?
2.23
22.32
0.022
0.31
The instrument used to measure the relative isotopic masses of an element is?
photometer
spectrometer
radiometer
polarimeter
