2017年5月IB化学SL真题下载-Paper1
1. Which compound has the greatest percentage by mass of nitrogen atoms?
A. N2H4
B. NH3
C. N2O4
D. NaNO3
2. Which statements about mixtures are correct?
- I. The components may be elements or compounds.
- II. All components must be in the same phase.
- III. The components retain their individual properties.
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
3. 5.0 cm3 of 2.00 mol dm-3 sodium carbonate solution, Na2CO3 (aq), was added to a volumetric flask and the volume was made up to 500 cm3 with water. What is the concentration, in mol dm-3, of the solution?
A. 0.0050
B. 0.0040
C. 0.020
D. 0.010
4. What is the expression for the volume of hydrogen gas, in dm3, produced at STP when 0.30 g of magnesium reacts with excess hydrochloric acid solution?
Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g)
Molar volume of an ideal gas at STP = 22.7 dm3 mol−1
A. 030×2×22.7/24.31
B. 0.30×22.7/24.31
C. 030×24.31/22.7
D. 0.30×22.7/24.31×2
5. In which set do all the species contain more electrons than neutrons?
A. 14N, 16O, 11C
B. 14N, 16O, 11C4–
C. 14N3–, 16O2–, 11C
D. 14N3–, 16O2–, 11C4+
6. Which electron transition in the hydrogen atom emission spectrum emits radiation with the longest wavelength?
A. n = 2 → n = 1
B. n = 1 → n = 2
C. n = 4 → n = 1
D. n = 3 → n = 2
7. The full electron configuration of an element is:
1s2 2s2 2p6 3s2 3p2
To which group and period does the element belong?
8. Which oxide, when added to water, produces the solution with the highest pH?
A. Na2O
B. SO3
C. MgO
D. CO2
9. A substance has the following properties:
What is the most probable structure of this substance?
A. Network covalent
B. Polar covalent molecule
C. Ionic lattice
D. Metallic lattice
10.Which two atoms form the most polar bond?
A.C and F
B.C and Cl
C.Si and F
D.Si and Cl
2017年5月IB化学SL真题余下省略！
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