2020年11月IB化学SL真题下载-Paper1
1. What is the molar mass, in g mol−1, of a compound if 0.200 mol of the compound has a mass of 13.2 g?
A. 66.0
B. 66
C. 26.4
D. 26
2. What is the number of carbon atoms in 12 g of ethanoic acid CH3COOH, Mr = 60?
A. 0.20
B. 2.0
C. 1.2 × 1023
D. 2.4 × 1023
3. Which of these molecular formulae are also empirical formulae?
I. C2H6O
II. C2H4O2
III. C5H12
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
4. Which volume of ethane gas, in cm3, will produce 40 cm3 of carbon dioxide gas when mixed with 140 cm3 of oxygen gas, assuming the reaction goes to completion?
2C2H6 (g) + 7O2 (g) → 4CO2 (g) + 6H2O (g)
A. 10
B. 20
C. 40
D. 80
5.What is the relative atomic mass, Ar, of an element with this mass spectrum?
A.24.0
B.24.3
C.24.9
D.25.0
6.What is the maximum number of electrons that can occupy the 4th main energy level in an atom?
A.8
B.14
C.18
D.32
7.Which of the following shows a general increase across period 3 from Na to Cl?
A.Ionic radius
B.Atomic radius
C.Ionization energy
D.Melting point
8. Which oxide will dissolve in water to give the solution with the lowest pH?
A. P4O10
B. SiO2
C. Al2O3
D. MgO
9. Which formula is correct?
A. NH4PO4
B. (NH4)2PO4
C. (NH4)3PO4
D. (NH4)3(PO4)2
10. Which molecule is most polar?
A. CHF3
B. CF4
C. CClF3
D. CCl4
2020年11月IB化学SL真题余下省略！
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