2017年11月IB化学SL真题下载-Paper3
1. How many atoms of nitrogen are there in 0.50 mol of (NH4)2CO3?
A. 1
B. 2
C. 3.01 × 1023
D. 6.02 × 1023
2. What is the value of x when 32.2 g of Na2SO4·xH2O are heated leaving 14.2 g of anhydrous Na2SO4? Mr (H2O) = 18; Mr (Na2SO4) = 142.
Na2SO4·xH2O (s) → Na2SO4 (s) + xH2O (g)
A. 0.1
B. 1
C. 5
D. 10
3. How many grams of sodium azide, NaN3, are needed to produce 68.1 dm3 of N2(g) at STP?Molar volume at STP = 22.7 dm3 mol-1; Mr (NaN3) = 65.0
2NaN3 (s) → 3N2 (g) + 2Na (s)
A. 32.5
B. 65.0
C. 130.0
D. 195.0
4. What is the sum of the coefficients when the following equation is balanced using the smallest whole numbers?
__C6H12O6 (aq) → __C2H5OH (aq) + __CO2 (g)
A. 4
B. 5
C. 9
D. 10
5. What is the number of protons and the number of neutrons in 131I?
6. Which is the electron configuration of a chromium atom in the ground state?
A. [Ne]3s23p64s13d4
B. [Ar]3d3
C. 1s22s22p63s23p64s23d4
D. [Ar]4s13d5
7. Which trends are correct across period 3 (from Na to Cl)?
- I. Atomic radius decreases
- II. Melting point increases
- III. First ionization energy increases
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
8. Which oxide dissolves in water to give a solution with a pH below 7?
A. MgO
B. Li2O
C. CaO
D. P4O10
9. The electronegativity values of four elements are given.
What is the order of increasing polarity of the bonds in the following compounds?
A. CO < OF2 < NO < CF4
B. CF4 < CO < OF2 < NO
C. NO < OF2 < CO < CF4
D. CF4 < NO < OF2 < CO
10. Which compound has the shortest C–N bond?
A. CH3NH2
B. (CH3)3CNH2
C. CH3CN
D. CH3CHNH
2017年11月IB化学SL真题余下省略！
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