2018年5月IB化学SL真题下载-Paper1
1. Which is a homogeneous mixture?
A. Oil and water
B. Sand and water
C. Ethanol and water
D. Chalk and sand
2. What is the molecular formula of a hydrocarbon containing 84.6 % carbon by mass with a molar mass of 142.3 g mol−1?
A. C20H44
B. C11H10
C. C10H22
D. C5H11
3. Which graph shows the relationship between the volume and pressure of a fixed mass of an ideal gas?
4. What is the percentage yield when 7 g of ethene produces 6 g of ethanol? Mr (ethene) = 28 and Mr (ethanol) = 46
C2H4 (g) + H2O (g) → C2H5OH (g)
A. 6×7×100/28×46
B. 6×46×100/7×28
C. 6×28/7×46×100
D. 6×28×100/7×46
5. Which shows the number of subatomic particles in 31P3−?
6. Which are correct statements about the emission spectrum of hydrogen in the visible region?
- I. The red line has a lower energy than the blue line.
- II. The lines converge at longer wavelength.
- III. The frequency of the blue line is greater than the frequency of the red line.
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
7. Which describes the oxide of sodium, Na2O?
8. Which statement is correct?
A. Atomic radius decreases down group 17.
B. First ionization energy decreases down group 1.
C. Atomic radius increases across period 3 from Na to Cl.
D. First ionization energy decreases across period 3 from Na to Cl.
9. What is the formula of ammonium phosphate?
A. (NH3)3PO4
B. (NH4)3PO4
C. (NH4)2PO4
D. (NH3)2PO3
10. Which form of carbon is the poorest electrical conductor?
A. Graphite
B. Graphene
C. Diamond
D. Carbon nanotube
2018年5月IB化学SL真题余下省略！
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