2012年11月IB化学SL真题下载-Paper1

2012年11月IB化学SL真题下载-Paper1

1. What is the number of ions in 0.20 mol of (NH4)3PO4?

A. 8.0 ×10−1

B. 1.2 ×1023

C. 4.8 ×1023

D. 2.4 ×1024

2. What is the molar mass, in g mol–1, of washing soda crystals, Na2CO3•10H2O?

A. 105.99

B. 124.00

C. 263.15

D. 286.19

3. The equation for the reduction of iron(III) oxide is:

Fe2O3(s) + 3CO(g)→2Fe (s) + 3CO2(g)

What mass of carbon dioxide, in g, is produced by the complete reduction of 80 g of iron(III) oxide?

A. 44

B. 66

C. 88

D. 132

4. 3.0 dm3 of ethyne, C2H2 , is mixed with 3.0 dm3 of hydrogen and ignited. The equation for the reaction that occurs is shown below.

C2H2 (g) + 2H2 (g)→C2H6 (g)

Assuming the reaction goes to completion and all gas volumes are measured at the same temperature and pressure, what volume of ethane, C2H6 , in dm3, is formed?

A. 1.5

B. 2.0

C. 3.0

D. 6.0

5. What is the correct number of each particle in an oxygen ion, 18O2–?

6. Which statement about the electromagnetic spectrum is correct?

A. Infrared light has a shorter wavelength than ultraviolet light.

B. Visible light has a shorter wavelength than ultraviolet light.

C. The frequency of visible light is higher than the frequency of infrared light.

D. The energy of infrared light is higher than the energy of visible light.

7. Which statements about atomic structure and the periodic table are correct?

  • I. An element in group 2 has 2 electrons in its valence (outer) energy level.
  • II. An element in period 3 has electrons in 3 energy levels.
  • III. The element in group 2 and period 3 has an atomic number of 12.

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

8. Which combination is correct for the properties of the alkali metals from Li to Cs?

9. Which oxides are acidic?

  • I. P4O10
  • II. SO3
  • III. Na2O

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

10. What is the formula of the ionic compound formed when calcium and nitrogen react together?

A. Ca2N3

B. Ca3N2

C. Ca5N2

D. Ca2N5

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