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WorksheetsTopic 1-3 IB Chemistry SL
Total questions: 17
Worksheet time: 18mins
Which compound has the empirical formula with the greatest mass?
C2H6
C4H10
C5H10
C6H6
Under what conditions would one mole of methane gas, CH4, occupy the smallest volume?
273 K and 1.01×105 Pa
273 K and 2.02×105 Pa
546 K and 1.01×105 Pa
546 K and 2.02×105 Pa
Which of the following quantities has units?
Relative atomic mass
Relative molecular mass
Molar mass
Mass number
A reaction occurring in the extraction of lead from its ore can be represented by this unbalanced equation:
__ PbS + __O2 --> __ PbO + __ SO2
When the equation is balanced using the smallest possible whole numbers, what is the coefficient for O2?
1
2
3
4
Methane, CH4, burns in oxygen gas to form carbon dioxide and water. How many moles of carbon dioxide will be formed from 8.0 g of methane?
0.25
0.5
1
2
What is the empirical formula of a compound containing 50% by mass of element X (Ar = 20) and 50% by mass of element Y (Ar = 25)?
XY
X3Y2
X4Y5
X5Y4
What is the electron arrangement of silicon?
2.4
2.8
2.8.4
2.8.8
Which statement is correct for the emission spectrum of the hydrogen atom?
The lines converge at lower energies.
The lines are produced when electrons move from lower to higher energy levels.
The lines in the visible region involve electron transitions into the energy level closest to the nucleus.
The line corresponding to the greatest emission of energy is in the ultraviolet region.
What is the symbol for a species that contains 15 protons, 16 neutrons and 18 electrons?
3116S
3116S3-
3115P-
3115P3-
Which statements are correct for the emission spectrum of the hydrogen atom?
I. The lines converge at lower energies.
II. Electron transition to n =1 are responsible for lines in the UV region.
III. Lines are produced when electrons move from higher to lower energy levels.
I and II only
I and III only
II and III only
I, II and III
A certain sample of element X contains 40% of 30X and 60% of 32X. What is the relative atomic mass of element Z in this sample?
30.8
31.2
31.4
31.6
A potassium atom has a larger atomic radius than a sodium atom. Which statement about potassium correctly explains this difference?
It has a larger nuclear charge.
It has a lower electronegativity.
It has more energy levels occupied by electrons.
It has a lower ionization energy.
When Na, K, and Mg are arranged in increasing order of atomic radius (smallest first), which order is correct?
Na, K, Mg
Na, Mg, K
K, Mg, Na
Mg, Na, K
Which oxides produce an acidic solution when added to water?
I. SiO2
II. P4O6
III. SO2
I and II only
I and III only
II and III only
I, II and III
Which of the following statements are correct?
I. The melting points decrease from Li ® Cs for the alkali metals.
II. The melting points increase from F ® I for the halogens.
III. The melting points decrease from Na ® Ar for the period 3 elements.
I and II only
I and III only
II and III only
I, II and III
Which element is part of the lanthanides ?
Ta
Tb
Pu
Rg
What is the electron configuration of Chromium?
1s2 2s2 2p6 3s2 3p4 4s2 3d4
1s2 2s2 2p6 3s2 3p4 4s1 3d10
1s2 2s2 2p6 3s2 3p4 4s2 3d9
1s2 2s2 2p6 3s2 3p4 3d5 4s1
