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WorksheetsTopical Test Chapter 1
Total questions: 20
Worksheet time: 45mins
Which atom has the smallest number of neutrons?
carbon-12
nitrogen-14
oxygen-16
fluorine-19
Identify the species that has the same number of electrons and neutrons.
1H
14C
19F−
14C2+
Which of these represent an element?
i Ne
ii Cl2
iii O3
i and ii
ii and iii
all of above
A calcium atom is 3.33 times the mass of a carbon atom. What is the atomic mass of calcium?
33
40
38
12
The mass spectrum of Ne shows three peaks at masses 20, 21, and 22 amu. The heights of the peaks are in the ratio 114:0.2:11.2. The average atomic mass of Ne is
114+0.2+11.2(20×114)+(21×11.2)+(22×0.2)
20+21+22(20×114)+(21×0.2)+(22×11.2)
114+0.2+11.2(20×114)+(21×0.2)+(22×11.2)
114+11.2(20×114)+(22×11.2)
A solution contains 28% sulphuric acid by mass. This means that
1dm3 of solution contains 28g of sulphuric acid
1dm3 of solution has a mass of 28g
100g of solution contains 28g of sulphuric acid
100g of solution contains 28% sulphuric
The number of oxygen atoms in 2.50 mol K2Cr2O7 is
6.02 x 1023
1.20 x 1024
1.55 x 1025
1.05 x 1025
What is the percent by mass of Na2CO3 in a 1.0 molal aqueous solution?
8.5
9.6
10.2
12.4
A 45% by mass of glucose (C6H12O6) solution contains 70g of water. What is the mass of glucose in the solution?
57.3
53.3
35.7
17.5
How many nitrogen atoms are present in 28 dm3 of nitrogen gas at s.t.p?
(Molar volume of gas = 22.4 dm3 at s.t.p ; Avogadro constant = 6.02 x 1023)
1.5 x 1023 atoms
7.5 x 1023 atoms
1.5 x 1024 atoms
3.0 x 1024 atoms
Select the compound in which sulphur has the highest oxidation number.
SO2
SCl2
H2SO3
Na2SO4
What is the coefficient of Fe3O4 when the following equation is correctly balanced.
Al + Fe3O4 --> Al2O3 + Fe
1
2
3
4
All of the following are empirical formulae EXCEPT
CH2O
N2O
N2O4
CH2
Which of the following pair represent(s) a molecular formula and its empirical formula respectively?
i CH4, CH4
ii C2H6, CH3
iii C4H8, CnH2n
i and ii
ii and iii
i and iii
Aspirin, C9H8O4 is produced from salicylic acid, C7H6O3 and acetic anhydride, C4H6O3.
C7H6O3 + C4H6O3 --> C9H8O4 + CH3COOH
How many grams of salicylic acid are used to produce 65.0g of aspirin if the percentage yield is 80%?
60.0
62.3
65.0
80.0
The mass of bromine atom is about four times greater than that of neon atom. What is the relative numbers of bromine and neon atoms in 1000 g of each element?
There are four times as many bromine atoms as neon atoms.
There are four times as many neon atoms as bromine atoms.
There are one thousand times as many bromine atoms as neon atoms.
There are one thousand times as many neon atoms as bromine atoms.
Which of the following equations DOES NOT represent a redox equation?
2H2O --> 2H2 + O2
2NaI + Br2 --> 2NaBr + I2
Cu(NO3)2 + Zn --> Zn(NO3)2 + Cu
2NaCl + Pb(NO3)2 --> PbCl2 + 3NaNO3
Balance the following equation:
Fe2O3 + HCl --> FeCl3 + H2O
1,6,1,1
1,2,2,1
1,6,2,3
1,2,1,3
Which statement is true of the two isotopes, 12C and 14C?
They have the same number of neutrons
They have the same relative isotopic mass
They have a different number of electrons
They have different physical properties
In the presence of dissolved oxygen, an acidic solution of iron(II) salt is slowly oxidised to form iron(III) salt. Which of the following is a balanced redox equation for the reaction?
Fe2+ + 1/2 O2 + 2H+ --> Fe3+ + H2O
2Fe2+ + 1/2 O2 + 2H+ --> 2Fe3+ + H2O
2Fe2+ + O2 + 2H+ --> 2Fe3+ + H2O
2Fe2+ + O2 + 2H+ --> 2Fe3+ + 3H2O
