2013年5月IB化学SL真题下载-Paper1

2013年5月IB化学SL真题下载-Paper1

1. Which statements are correct about Avogadro’s constant?

I. It is the number of ions in 12 g of sodium hydride, NaH.

II. It is the number of molecules in 22.4 dm3 of hydrogen gas at 0C° and 1 atm.

III. It is the number of atoms in 12 g of 12C.

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

2. What is the molar mass, in g mol–1, of a substance if 0.30 mol of the substance has a mass of 18 g?

A. 5.4

B. 6.0

C. 30

D. 60

3. What is the whole number ratio of the coefficients of ammonia to oxygen when the following equation is balanced correctly?

___NH3(g)___O2(g) ___NO(g) ___H2O(l)

A. 1 : 2

B. 2 : 1

C. 4 : 5

D. 5 : 4

4. When 50 cm3 of a hydrocarbon, CxHy , was burned in excess oxygen, 200 cm3 of carbon dioxide and 250 cm3 of steam were produced (all volumes were measured under the same conditions). What is the molecular formula of the hydrocarbon?

A. C2H4

B. C3H8

C. C4H8

D. C4H10

5. What is the pressure, in Pa, in a 100 cm3 container containing 1.8 g of steam at a temperature of 727C°? (R = 8.31 J K–1 mol–1)

A. 1.8×8.31×727/18×100

B. 18×100/1.8×8.31×727

C. 1.8×8.31×1000/18×10−4

D. 1.8×8.31/1.8×10-41000

6. Which statements about the isotopes of an element are correct?

  • I. They have the same chemical properties.
  • II. They have different physical properties.
  • III. They have the same number of protons and electrons.

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

7. Which diagram shows a pattern similar to the emission spectrum of hydrogen?

8. Which statement concerning electronegativity is correct?

A. Electronegativity increases from left to right across a period.

B. Metals generally have higher electronegativity values than non-metals.

C. Electronegativity increases on descending a group.

D. Noble gases have the highest electronegativity values.

9. Which statements are correct?

  • I. Fluorine will react with potassium chloride solution to produce chlorine.
  • II. Iodine will react with sodium chloride solution to produce chlorine.
  • III. Bromine will react with lithium iodide solution to produce iodine.

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

10. Which statement best describes ionic bonding?

A. It is the electrostatic attraction between positive ions and delocalized electrons and occurs by the transfer of electrons.

B. It is the electrostatic attraction between positive ions and negative ions and occurs by the transfer of electrons.

C. It is the electrostatic attraction between positive ions and negative ions and occurs by the sharing of electrons.

D. It is the electrostatic attraction between positive nuclei and electrons and occurs by the sharing of electrons.

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